TargetRegisterInfo.h revision dc140c6e7b8350ca51aa1d408c10e25a27826e2c
16f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman//=== Target/TargetRegisterInfo.h - Target Register Information -*- C++ -*-===// 234695381d626485a560594f162701088079589dfMisha Brukman// 36fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// The LLVM Compiler Infrastructure 46fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell// 57ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// This file is distributed under the University of Illinois Open Source 67ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// License. See LICENSE.TXT for details. 734695381d626485a560594f162701088079589dfMisha Brukman// 86fbcc26f1460eaee4e0eb8b426fc1ff0c7af11beJohn Criswell//===----------------------------------------------------------------------===// 93d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner// 103d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner// This file describes an abstract interface used to get information about a 113d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner// target machines register file. This information is used for a variety of 123d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner// purposed, especially register allocation. 133d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner// 143d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner//===----------------------------------------------------------------------===// 153d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner 166f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman#ifndef LLVM_TARGET_TARGETREGISTERINFO_H 176f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman#define LLVM_TARGET_TARGETREGISTERINFO_H 183d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner 19024126ee23e6e4430a77025b61d0e713180f03d3Alkis Evlogimenos#include "llvm/CodeGen/MachineBasicBlock.h" 20a385bf7b6dc9b71024aa4c7bb7026bab3c7ebe91Chris Lattner#include "llvm/CodeGen/ValueTypes.h" 21ddeed50d76e2ad52d3ccb3664d21dfe1463179c6Owen Anderson#include "llvm/ADT/DenseSet.h" 224d0d864be3d9a698c4edfe36961a22126f041298Alkis Evlogimenos#include <cassert> 234d0d864be3d9a698c4edfe36961a22126f041298Alkis Evlogimenos#include <functional> 243d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner 25d0fde30ce850b78371fd1386338350591f9ff494Brian Gaekenamespace llvm { 26d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 27171eed533408a23de0b141af17475fd6b4da72e0Evan Chengclass BitVector; 28198ab640bbb0b8e1cdda518b7f8b348764e4402cChris Lattnerclass MachineFunction; 294188699f80c233a20b6ddc61570a8a8c1804cb85Jim Laskeyclass MachineMove; 30171eed533408a23de0b141af17475fd6b4da72e0Evan Chengclass RegScavenger; 31b990a2f249196ad3e0cc451d40a45fc2f9278eafEvan Chengtemplate<class T> class SmallVectorImpl; 32282ec57c4cdd4574103922487b6f1563b5034fb4Misha Brukman 330f21fd5204a2627c613340269e2e39e2c8cca659Chris Lattner/// TargetRegisterDesc - This record contains all of the information known about 340f21fd5204a2627c613340269e2e39e2c8cca659Chris Lattner/// a particular register. The AliasSet field (if not null) contains a pointer 350f21fd5204a2627c613340269e2e39e2c8cca659Chris Lattner/// to a Zero terminated array of registers that this register aliases. This is 3600032bf6cc236b1fb534f74b1ac288f611a86804Chris Lattner/// needed for architectures like X86 which have AL alias AX alias EAX. 3700032bf6cc236b1fb534f74b1ac288f611a86804Chris Lattner/// Registers that this does not apply to simply should set this to null. 38a92d62c15fa2bf84453489716323b0159912c55dEvan Cheng/// The SubRegs field is a zero terminated array of registers that are 39a92d62c15fa2bf84453489716323b0159912c55dEvan Cheng/// sub-registers of the specific register, e.g. AL, AH are sub-registers of AX. 402036835346ddf983d66b49505bd52db1d3f8b49dEvan Cheng/// The SuperRegs field is a zero terminated array of registers that are 412036835346ddf983d66b49505bd52db1d3f8b49dEvan Cheng/// super-registers of the specific register, e.g. RAX, EAX, are super-registers 422036835346ddf983d66b49505bd52db1d3f8b49dEvan Cheng/// of AX. 433d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner/// 440f21fd5204a2627c613340269e2e39e2c8cca659Chris Lattnerstruct TargetRegisterDesc { 45e6d088acc90e422451e098555d383d4d65b6ce6bBill Wendling const char *Name; // Printable name for the reg (for debugging) 46303603f75876c1cb407002f0a3a110fe4c202b31Chris Lattner const unsigned *AliasSet; // Register Alias Set, described above 47a92d62c15fa2bf84453489716323b0159912c55dEvan Cheng const unsigned *SubRegs; // Sub-register set, described above 4850aadb96932a0f81ed69f73da6e7c8f8a453ee75Evan Cheng const unsigned *SuperRegs; // Super-register set, described above 493d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner}; 503d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner 51282ec57c4cdd4574103922487b6f1563b5034fb4Misha Brukmanclass TargetRegisterClass { 52282ec57c4cdd4574103922487b6f1563b5034fb4Misha Brukmanpublic: 530f24e33b73542bd7b280550aec6cff32d808e724Chris Lattner typedef const unsigned* iterator; 540f24e33b73542bd7b280550aec6cff32d808e724Chris Lattner typedef const unsigned* const_iterator; 55282ec57c4cdd4574103922487b6f1563b5034fb4Misha Brukman 56e50ed30282bb5b4a9ed952580523f2dda16215acOwen Anderson typedef const EVT* vt_iterator; 573b0c0148ed9ec752b240dbea767ad4a9f0a682caEvan Cheng typedef const TargetRegisterClass* const * sc_iterator; 580f24e33b73542bd7b280550aec6cff32d808e724Chris Lattnerprivate: 5960f09928a0d22d5927ff0a40fe9163cf1ba1014aJim Laskey unsigned ID; 6041c90738e9e7e2111fbc31944b5ce2676830f267Chris Lattner const char *Name; 6116d597a20d405d8cb13f89f15b8c1fed20428808Chris Lattner const vt_iterator VTs; 62696736be8b80fe3946f73605b46359345afdf57aEvan Cheng const sc_iterator SubClasses; 63c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng const sc_iterator SuperClasses; 64f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman const sc_iterator SubRegClasses; 65f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman const sc_iterator SuperRegClasses; 66f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner const unsigned RegSize, Alignment; // Size & Alignment of register in bytes 67a3ca3149f2b59c512c50aab330b5a0d8efddeffaEvan Cheng const int CopyCost; 680f24e33b73542bd7b280550aec6cff32d808e724Chris Lattner const iterator RegsBegin, RegsEnd; 69ddeed50d76e2ad52d3ccb3664d21dfe1463179c6Owen Anderson DenseSet<unsigned> RegSet; 700f24e33b73542bd7b280550aec6cff32d808e724Chris Lattnerpublic: 7160f09928a0d22d5927ff0a40fe9163cf1ba1014aJim Laskey TargetRegisterClass(unsigned id, 7241c90738e9e7e2111fbc31944b5ce2676830f267Chris Lattner const char *name, 73e50ed30282bb5b4a9ed952580523f2dda16215acOwen Anderson const EVT *vts, 743b0c0148ed9ec752b240dbea767ad4a9f0a682caEvan Cheng const TargetRegisterClass * const *subcs, 753b0c0148ed9ec752b240dbea767ad4a9f0a682caEvan Cheng const TargetRegisterClass * const *supcs, 76f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman const TargetRegisterClass * const *subregcs, 77f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman const TargetRegisterClass * const *superregcs, 78a3ca3149f2b59c512c50aab330b5a0d8efddeffaEvan Cheng unsigned RS, unsigned Al, int CC, 79a3ca3149f2b59c512c50aab330b5a0d8efddeffaEvan Cheng iterator RB, iterator RE) 8041c90738e9e7e2111fbc31944b5ce2676830f267Chris Lattner : ID(id), Name(name), VTs(vts), SubClasses(subcs), SuperClasses(supcs), 81f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman SubRegClasses(subregcs), SuperRegClasses(superregcs), 82ddeed50d76e2ad52d3ccb3664d21dfe1463179c6Owen Anderson RegSize(RS), Alignment(Al), CopyCost(CC), RegsBegin(RB), RegsEnd(RE) { 83ddeed50d76e2ad52d3ccb3664d21dfe1463179c6Owen Anderson for (iterator I = RegsBegin, E = RegsEnd; I != E; ++I) 84ddeed50d76e2ad52d3ccb3664d21dfe1463179c6Owen Anderson RegSet.insert(*I); 85ddeed50d76e2ad52d3ccb3664d21dfe1463179c6Owen Anderson } 860f24e33b73542bd7b280550aec6cff32d808e724Chris Lattner virtual ~TargetRegisterClass() {} // Allow subclasses 8795923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 886c8d90d65fa721d406c7a09a0045fa49254a9244Chris Lattner /// getID() - Return the register class ID number. 896c8d90d65fa721d406c7a09a0045fa49254a9244Chris Lattner /// 9060f09928a0d22d5927ff0a40fe9163cf1ba1014aJim Laskey unsigned getID() const { return ID; } 9141c90738e9e7e2111fbc31944b5ce2676830f267Chris Lattner 9241c90738e9e7e2111fbc31944b5ce2676830f267Chris Lattner /// getName() - Return the register class name for debugging. 9341c90738e9e7e2111fbc31944b5ce2676830f267Chris Lattner /// 9441c90738e9e7e2111fbc31944b5ce2676830f267Chris Lattner const char *getName() const { return Name; } 9541c90738e9e7e2111fbc31944b5ce2676830f267Chris Lattner 966c8d90d65fa721d406c7a09a0045fa49254a9244Chris Lattner /// begin/end - Return all of the registers in this class. 976c8d90d65fa721d406c7a09a0045fa49254a9244Chris Lattner /// 980f24e33b73542bd7b280550aec6cff32d808e724Chris Lattner iterator begin() const { return RegsBegin; } 990f24e33b73542bd7b280550aec6cff32d808e724Chris Lattner iterator end() const { return RegsEnd; } 100282ec57c4cdd4574103922487b6f1563b5034fb4Misha Brukman 1016c8d90d65fa721d406c7a09a0045fa49254a9244Chris Lattner /// getNumRegs - Return the number of registers in this class. 1026c8d90d65fa721d406c7a09a0045fa49254a9244Chris Lattner /// 10334cd4a484e532cc463fd5a4bf59b88d13c5467c1Evan Cheng unsigned getNumRegs() const { return (unsigned)(RegsEnd-RegsBegin); } 104f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner 1056c8d90d65fa721d406c7a09a0045fa49254a9244Chris Lattner /// getRegister - Return the specified register in the class. 1066c8d90d65fa721d406c7a09a0045fa49254a9244Chris Lattner /// 1070f24e33b73542bd7b280550aec6cff32d808e724Chris Lattner unsigned getRegister(unsigned i) const { 1080f24e33b73542bd7b280550aec6cff32d808e724Chris Lattner assert(i < getNumRegs() && "Register number out of range!"); 1090f24e33b73542bd7b280550aec6cff32d808e724Chris Lattner return RegsBegin[i]; 1100f24e33b73542bd7b280550aec6cff32d808e724Chris Lattner } 111282ec57c4cdd4574103922487b6f1563b5034fb4Misha Brukman 112f02b37da6f956dc9120a0da6ffa643b2753beb41Chris Lattner /// contains - Return true if the specified register is included in this 113e08b320f15b95eb3279fddba6ccb615eafbc4225Dan Gohman /// register class. This does not include virtual registers. 114f02b37da6f956dc9120a0da6ffa643b2753beb41Chris Lattner bool contains(unsigned Reg) const { 115ddeed50d76e2ad52d3ccb3664d21dfe1463179c6Owen Anderson return RegSet.count(Reg); 116f02b37da6f956dc9120a0da6ffa643b2753beb41Chris Lattner } 117f02b37da6f956dc9120a0da6ffa643b2753beb41Chris Lattner 118320bdcbfe2691021702085f718db1617b1d4df49Jakob Stoklund Olesen /// contains - Return true if both registers are in this class. 119320bdcbfe2691021702085f718db1617b1d4df49Jakob Stoklund Olesen bool contains(unsigned Reg1, unsigned Reg2) const { 120320bdcbfe2691021702085f718db1617b1d4df49Jakob Stoklund Olesen return contains(Reg1) && contains(Reg2); 121320bdcbfe2691021702085f718db1617b1d4df49Jakob Stoklund Olesen } 122320bdcbfe2691021702085f718db1617b1d4df49Jakob Stoklund Olesen 1236510b22cec7de4f0acc9965ec24c3668a6a8a87eNate Begeman /// hasType - return true if this TargetRegisterClass has the ValueType vt. 1246510b22cec7de4f0acc9965ec24c3668a6a8a87eNate Begeman /// 125e50ed30282bb5b4a9ed952580523f2dda16215acOwen Anderson bool hasType(EVT vt) const { 126825b72b0571821bf2d378749f69d6c4cfb52d2f9Owen Anderson for(int i = 0; VTs[i].getSimpleVT().SimpleTy != MVT::Other; ++i) 1276510b22cec7de4f0acc9965ec24c3668a6a8a87eNate Begeman if (VTs[i] == vt) 1286510b22cec7de4f0acc9965ec24c3668a6a8a87eNate Begeman return true; 1296510b22cec7de4f0acc9965ec24c3668a6a8a87eNate Begeman return false; 1306510b22cec7de4f0acc9965ec24c3668a6a8a87eNate Begeman } 13195923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 132696736be8b80fe3946f73605b46359345afdf57aEvan Cheng /// vt_begin / vt_end - Loop over all of the value types that can be 133696736be8b80fe3946f73605b46359345afdf57aEvan Cheng /// represented by values in this register class. 13416d597a20d405d8cb13f89f15b8c1fed20428808Chris Lattner vt_iterator vt_begin() const { 13516d597a20d405d8cb13f89f15b8c1fed20428808Chris Lattner return VTs; 13616d597a20d405d8cb13f89f15b8c1fed20428808Chris Lattner } 13716d597a20d405d8cb13f89f15b8c1fed20428808Chris Lattner 13816d597a20d405d8cb13f89f15b8c1fed20428808Chris Lattner vt_iterator vt_end() const { 13916d597a20d405d8cb13f89f15b8c1fed20428808Chris Lattner vt_iterator I = VTs; 140825b72b0571821bf2d378749f69d6c4cfb52d2f9Owen Anderson while (I->getSimpleVT().SimpleTy != MVT::Other) ++I; 14116d597a20d405d8cb13f89f15b8c1fed20428808Chris Lattner return I; 14216d597a20d405d8cb13f89f15b8c1fed20428808Chris Lattner } 143696736be8b80fe3946f73605b46359345afdf57aEvan Cheng 144f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// subregclasses_begin / subregclasses_end - Loop over all of 145f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// the subreg register classes of this register class. 146f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman sc_iterator subregclasses_begin() const { 147f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman return SubRegClasses; 148f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman } 149f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman 150f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman sc_iterator subregclasses_end() const { 151f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman sc_iterator I = SubRegClasses; 152f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman while (*I != NULL) ++I; 153f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman return I; 154f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman } 155f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman 156fa4677b483b85217ac216f7e8d401c40cbe348aaJakob Stoklund Olesen /// getSubRegisterRegClass - Return the register class of subregisters with 157fa4677b483b85217ac216f7e8d401c40cbe348aaJakob Stoklund Olesen /// index SubIdx, or NULL if no such class exists. 158fa4677b483b85217ac216f7e8d401c40cbe348aaJakob Stoklund Olesen const TargetRegisterClass* getSubRegisterRegClass(unsigned SubIdx) const { 159fa4677b483b85217ac216f7e8d401c40cbe348aaJakob Stoklund Olesen assert(SubIdx>0 && "Invalid subregister index"); 160fa4677b483b85217ac216f7e8d401c40cbe348aaJakob Stoklund Olesen return SubRegClasses[SubIdx-1]; 161fa4677b483b85217ac216f7e8d401c40cbe348aaJakob Stoklund Olesen } 162fa4677b483b85217ac216f7e8d401c40cbe348aaJakob Stoklund Olesen 163f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// superregclasses_begin / superregclasses_end - Loop over all of 164f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// the superreg register classes of this register class. 165f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman sc_iterator superregclasses_begin() const { 166f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman return SuperRegClasses; 167f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman } 168f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman 169f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman sc_iterator superregclasses_end() const { 170f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman sc_iterator I = SuperRegClasses; 171f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman while (*I != NULL) ++I; 172f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman return I; 173f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman } 174f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman 175f451cb870efcf9e0302d25ed05f4cac6bb494e42Dan Gohman /// hasSubClass - return true if the specified TargetRegisterClass 176f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// is a proper subset of this TargetRegisterClass. 1771367fd09cb021bae61e7dd2ee208f76574c8e789Christopher Lamb bool hasSubClass(const TargetRegisterClass *cs) const { 17895923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach for (int i = 0; SubClasses[i] != NULL; ++i) 179696736be8b80fe3946f73605b46359345afdf57aEvan Cheng if (SubClasses[i] == cs) 180696736be8b80fe3946f73605b46359345afdf57aEvan Cheng return true; 181696736be8b80fe3946f73605b46359345afdf57aEvan Cheng return false; 182696736be8b80fe3946f73605b46359345afdf57aEvan Cheng } 183696736be8b80fe3946f73605b46359345afdf57aEvan Cheng 184f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// subclasses_begin / subclasses_end - Loop over all of the classes 185f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// that are proper subsets of this register class. 186696736be8b80fe3946f73605b46359345afdf57aEvan Cheng sc_iterator subclasses_begin() const { 187696736be8b80fe3946f73605b46359345afdf57aEvan Cheng return SubClasses; 188696736be8b80fe3946f73605b46359345afdf57aEvan Cheng } 18995923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 190696736be8b80fe3946f73605b46359345afdf57aEvan Cheng sc_iterator subclasses_end() const { 191696736be8b80fe3946f73605b46359345afdf57aEvan Cheng sc_iterator I = SubClasses; 192696736be8b80fe3946f73605b46359345afdf57aEvan Cheng while (*I != NULL) ++I; 193696736be8b80fe3946f73605b46359345afdf57aEvan Cheng return I; 194696736be8b80fe3946f73605b46359345afdf57aEvan Cheng } 19595923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 1961367fd09cb021bae61e7dd2ee208f76574c8e789Christopher Lamb /// hasSuperClass - return true if the specified TargetRegisterClass is a 197f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// proper superset of this TargetRegisterClass. 1981367fd09cb021bae61e7dd2ee208f76574c8e789Christopher Lamb bool hasSuperClass(const TargetRegisterClass *cs) const { 19995923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach for (int i = 0; SuperClasses[i] != NULL; ++i) 200c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng if (SuperClasses[i] == cs) 201c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng return true; 202c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng return false; 203c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng } 204c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng 205f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// superclasses_begin / superclasses_end - Loop over all of the classes 206f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// that are proper supersets of this register class. 207c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng sc_iterator superclasses_begin() const { 208c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng return SuperClasses; 209c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng } 21095923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 211c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng sc_iterator superclasses_end() const { 212c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng sc_iterator I = SuperClasses; 213c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng while (*I != NULL) ++I; 214c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng return I; 215c3580cace271b0f7d35a25eb285a1cc0d644c30cEvan Cheng } 2168c08d8c77c45d4721e7d3ef746cca9e39b28e379Evan Cheng 217f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// isASubClass - return true if this TargetRegisterClass is a subset 218f8c7394781f7cf27ac52ca087e289436d36844daDan Gohman /// class of at least one other TargetRegisterClass. 2198c08d8c77c45d4721e7d3ef746cca9e39b28e379Evan Cheng bool isASubClass() const { 2208c08d8c77c45d4721e7d3ef746cca9e39b28e379Evan Cheng return SuperClasses[0] != 0; 2218c08d8c77c45d4721e7d3ef746cca9e39b28e379Evan Cheng } 22295923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 223f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// allocation_order_begin/end - These methods define a range of registers 224f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// which specify the registers in this class that are valid to register 225f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// allocate, and the preferred order to allocate them in. For example, 226f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// callee saved registers should be at the end of the list, because it is 227f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// cheaper to allocate caller saved registers. 228f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// 229f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// These methods take a MachineFunction argument, which can be used to tune 230f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// the allocatable registers based on the characteristics of the function. 231f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// One simple example is that the frame pointer register can be used if 232f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// frame-pointer-elimination is performed. 233f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// 234f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// By default, these methods return all registers in the class. 235f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// 2365ea64fd9eb0027ad20a66ea29211eef79d8842a0Chris Lattner virtual iterator allocation_order_begin(const MachineFunction &MF) const { 237f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner return begin(); 238f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner } 2395ea64fd9eb0027ad20a66ea29211eef79d8842a0Chris Lattner virtual iterator allocation_order_end(const MachineFunction &MF) const { 240f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner return end(); 241f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner } 24234695381d626485a560594f162701088079589dfMisha Brukman 243f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// getSize - Return the size of the register in bytes, which is also the size 244f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// of a stack slot allocated to hold a spilled copy of this register. 245f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner unsigned getSize() const { return RegSize; } 246f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner 247f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// getAlignment - Return the minimum required alignment for a register of 248f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// this class. 249f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner unsigned getAlignment() const { return Alignment; } 250a3ca3149f2b59c512c50aab330b5a0d8efddeffaEvan Cheng 251a3ca3149f2b59c512c50aab330b5a0d8efddeffaEvan Cheng /// getCopyCost - Return the cost of copying a value between two registers in 252b3a021cdb3d26ddb2985e326ba0cb96761b86f69Evan Cheng /// this class. A negative number means the register class is very expensive 253b3a021cdb3d26ddb2985e326ba0cb96761b86f69Evan Cheng /// to copy e.g. status flag register classes. 254a3ca3149f2b59c512c50aab330b5a0d8efddeffaEvan Cheng int getCopyCost() const { return CopyCost; } 255282ec57c4cdd4574103922487b6f1563b5034fb4Misha Brukman}; 256282ec57c4cdd4574103922487b6f1563b5034fb4Misha Brukman 257282ec57c4cdd4574103922487b6f1563b5034fb4Misha Brukman 2586f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman/// TargetRegisterInfo base class - We assume that the target defines a static 2596f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman/// array of TargetRegisterDesc objects that represent all of the machine 2606f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman/// registers that the target has. As such, we simply have to track a pointer 2616f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman/// to this array so that we can turn register number into a register 2626f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman/// descriptor. 2633d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner/// 2646f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohmanclass TargetRegisterInfo { 265f4f9c4f1cf4d497c63e40e6c7ef545c8c716a5ceOwen Andersonprotected: 266605041e5a81fbb18769b0613dcd14e0cff32b5eeOwen Anderson const unsigned* SubregHash; 267605041e5a81fbb18769b0613dcd14e0cff32b5eeOwen Anderson const unsigned SubregHashSize; 2683ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson const unsigned* AliasesHash; 2693ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson const unsigned AliasesHashSize; 2708797caac84c3012416e933c9c05ad34d75bf4029Chris Lattnerpublic: 2718797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner typedef const TargetRegisterClass * const * regclass_iterator; 2728797caac84c3012416e933c9c05ad34d75bf4029Chris Lattnerprivate: 2730f21fd5204a2627c613340269e2e39e2c8cca659Chris Lattner const TargetRegisterDesc *Desc; // Pointer to the descriptor array 2741fc8e759a767077726f9be35b93767e68bdf101fJakob Stoklund Olesen const char *const *SubRegIndexNames; // Names of subreg indexes. 2758797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner unsigned NumRegs; // Number of entries in the array 2768797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner 2778797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner regclass_iterator RegClassBegin, RegClassEnd; // List of regclasses 2788797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner 279f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner int CallFrameSetupOpcode, CallFrameDestroyOpcode; 280b9c2fd964ee7dd7823ac71db8443055e4d0f1c15David Greene 2813d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattnerprotected: 2826f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman TargetRegisterInfo(const TargetRegisterDesc *D, unsigned NR, 2836f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman regclass_iterator RegClassBegin, 2846f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman regclass_iterator RegClassEnd, 2851fc8e759a767077726f9be35b93767e68bdf101fJakob Stoklund Olesen const char *const *subregindexnames, 2866f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman int CallFrameSetupOpcode = -1, 287605041e5a81fbb18769b0613dcd14e0cff32b5eeOwen Anderson int CallFrameDestroyOpcode = -1, 288605041e5a81fbb18769b0613dcd14e0cff32b5eeOwen Anderson const unsigned* subregs = 0, 2897d770be047059d624f37c6fb1e5b1d0f2b4961b3Owen Anderson const unsigned subregsize = 0, 2904d4eab219a96203f58452b39b4e94e234dfe4007Bill Wendling const unsigned* aliases = 0, 2914d4eab219a96203f58452b39b4e94e234dfe4007Bill Wendling const unsigned aliasessize = 0); 2926f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman virtual ~TargetRegisterInfo(); 2933d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattnerpublic: 2943d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner 295ef6a6a69ff1e1b709d0acb315b9f6c926c67a778Misha Brukman enum { // Define some target independent constants 2961eaf0ac1dc470fb846c16c966d1ffff8213b33efChris Lattner /// NoRegister - This physical register is not a real target register. It 2971eaf0ac1dc470fb846c16c966d1ffff8213b33efChris Lattner /// is useful as a sentinal. 2983d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner NoRegister = 0, 2993d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner 3003d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner /// FirstVirtualRegister - This is the first register number that is 3013d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner /// considered to be a 'virtual' register, which is part of the SSA 3023d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner /// namespace. This must be the same for all targets, which means that each 303fb28579c568fcafaa4fb2a573b510deb6a6074e9Dan Gohman /// target is limited to this fixed number of registers. 3043012e2213bd29bd9202bf17d4053eae25311ecd7Eric Christopher FirstVirtualRegister = 1024 3053d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner }; 3063d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner 307bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner /// isPhysicalRegister - Return true if the specified register number is in 308bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner /// the physical register namespace. 309bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner static bool isPhysicalRegister(unsigned Reg) { 31071e353ed3530a5da48c3dd3257c410f6c4ce2e3eAlkis Evlogimenos assert(Reg && "this is not a register!"); 311bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner return Reg < FirstVirtualRegister; 312bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner } 313bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner 314bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner /// isVirtualRegister - Return true if the specified register number is in 315bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner /// the virtual register namespace. 316bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner static bool isVirtualRegister(unsigned Reg) { 31771e353ed3530a5da48c3dd3257c410f6c4ce2e3eAlkis Evlogimenos assert(Reg && "this is not a register!"); 318bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner return Reg >= FirstVirtualRegister; 319bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner } 320bd490d919bd36d2ab956031b524a55dd8519eb64Chris Lattner 321ce48c1de828688b34cf5c2038fde23368a0a45f4Rafael Espindola /// getMinimalPhysRegClass - Returns the Register Class of a physical 322c2af869d629b338861e1c6f0b360a233c0c0f9c4Dan Gohman /// register of the given type, picking the most sub register class of 323c2af869d629b338861e1c6f0b360a233c0c0f9c4Dan Gohman /// the right type that contains this physreg. 324d31f972bd33de85071c716f69bf5c6d735f730f2Rafael Espindola const TargetRegisterClass * 325d31f972bd33de85071c716f69bf5c6d735f730f2Rafael Espindola getMinimalPhysRegClass(unsigned Reg, EVT VT = MVT::Other) const; 326ce48c1de828688b34cf5c2038fde23368a0a45f4Rafael Espindola 327bb4bdf4fe4c931e45d0a37e24ec79accd815c1d8Alkis Evlogimenos /// getAllocatableSet - Returns a bitset indexed by register number 328eff03db46d5d1df315cf2aa020ccd7f50ab3848eEvan Cheng /// indicating if a register is allocatable or not. If a register class is 329eff03db46d5d1df315cf2aa020ccd7f50ab3848eEvan Cheng /// specified, returns the subset for the class. 330769b7f89534caed11d7595b5c84aa47d3de30ad9Dan Gohman BitVector getAllocatableSet(const MachineFunction &MF, 331eff03db46d5d1df315cf2aa020ccd7f50ab3848eEvan Cheng const TargetRegisterClass *RC = NULL) const; 332bb4bdf4fe4c931e45d0a37e24ec79accd815c1d8Alkis Evlogimenos 3330f21fd5204a2627c613340269e2e39e2c8cca659Chris Lattner const TargetRegisterDesc &operator[](unsigned RegNo) const { 3343d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner assert(RegNo < NumRegs && 3353d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner "Attempting to access record for invalid register number!"); 3363d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner return Desc[RegNo]; 3373d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner } 3383d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner 3393d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner /// Provide a get method, equivalent to [], but more useful if we have a 3403d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner /// pointer to this object. 3413d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner /// 3420f21fd5204a2627c613340269e2e39e2c8cca659Chris Lattner const TargetRegisterDesc &get(unsigned RegNo) const { 3430f21fd5204a2627c613340269e2e39e2c8cca659Chris Lattner return operator[](RegNo); 3440f21fd5204a2627c613340269e2e39e2c8cca659Chris Lattner } 3453d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner 34600032bf6cc236b1fb534f74b1ac288f611a86804Chris Lattner /// getAliasSet - Return the set of registers aliased by the specified 34700032bf6cc236b1fb534f74b1ac288f611a86804Chris Lattner /// register, or a null list of there are none. The list returned is zero 34800032bf6cc236b1fb534f74b1ac288f611a86804Chris Lattner /// terminated. 34900032bf6cc236b1fb534f74b1ac288f611a86804Chris Lattner /// 35000032bf6cc236b1fb534f74b1ac288f611a86804Chris Lattner const unsigned *getAliasSet(unsigned RegNo) const { 35100032bf6cc236b1fb534f74b1ac288f611a86804Chris Lattner return get(RegNo).AliasSet; 35200032bf6cc236b1fb534f74b1ac288f611a86804Chris Lattner } 353282ec57c4cdd4574103922487b6f1563b5034fb4Misha Brukman 3548102703d708e5d399926c6ba71ffa49bbd31fc8aEvan Cheng /// getSubRegisters - Return the list of registers that are sub-registers of 35550aadb96932a0f81ed69f73da6e7c8f8a453ee75Evan Cheng /// the specified register, or a null list of there are none. The list 3568102703d708e5d399926c6ba71ffa49bbd31fc8aEvan Cheng /// returned is zero terminated and sorted according to super-sub register 3578102703d708e5d399926c6ba71ffa49bbd31fc8aEvan Cheng /// relations. e.g. X86::RAX's sub-register list is EAX, AX, AL, AH. 358e3e31c22bf7ebed9e8e00ede4f4aa87ce2225528Evan Cheng /// 359e3e31c22bf7ebed9e8e00ede4f4aa87ce2225528Evan Cheng const unsigned *getSubRegisters(unsigned RegNo) const { 360e3e31c22bf7ebed9e8e00ede4f4aa87ce2225528Evan Cheng return get(RegNo).SubRegs; 361e3e31c22bf7ebed9e8e00ede4f4aa87ce2225528Evan Cheng } 362e3e31c22bf7ebed9e8e00ede4f4aa87ce2225528Evan Cheng 3638102703d708e5d399926c6ba71ffa49bbd31fc8aEvan Cheng /// getSuperRegisters - Return the list of registers that are super-registers 36450aadb96932a0f81ed69f73da6e7c8f8a453ee75Evan Cheng /// of the specified register, or a null list of there are none. The list 3658102703d708e5d399926c6ba71ffa49bbd31fc8aEvan Cheng /// returned is zero terminated and sorted according to super-sub register 3668102703d708e5d399926c6ba71ffa49bbd31fc8aEvan Cheng /// relations. e.g. X86::AL's super-register list is RAX, EAX, AX. 36750aadb96932a0f81ed69f73da6e7c8f8a453ee75Evan Cheng /// 36850aadb96932a0f81ed69f73da6e7c8f8a453ee75Evan Cheng const unsigned *getSuperRegisters(unsigned RegNo) const { 36950aadb96932a0f81ed69f73da6e7c8f8a453ee75Evan Cheng return get(RegNo).SuperRegs; 37050aadb96932a0f81ed69f73da6e7c8f8a453ee75Evan Cheng } 37150aadb96932a0f81ed69f73da6e7c8f8a453ee75Evan Cheng 372e6d088acc90e422451e098555d383d4d65b6ce6bBill Wendling /// getName - Return the human-readable symbolic target-specific name for the 373e6d088acc90e422451e098555d383d4d65b6ce6bBill Wendling /// specified physical register. 374e6d088acc90e422451e098555d383d4d65b6ce6bBill Wendling const char *getName(unsigned RegNo) const { 375e6d088acc90e422451e098555d383d4d65b6ce6bBill Wendling return get(RegNo).Name; 376181eb737b28628adc4376b973610a02039385026Bill Wendling } 377181eb737b28628adc4376b973610a02039385026Bill Wendling 3781c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// getNumRegs - Return the number of registers this target has (useful for 3791c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// sizing arrays holding per register information) 38093aa52a8a96c036454be9318bb1c78c9bfb5f390Alkis Evlogimenos unsigned getNumRegs() const { 38193aa52a8a96c036454be9318bb1c78c9bfb5f390Alkis Evlogimenos return NumRegs; 38293aa52a8a96c036454be9318bb1c78c9bfb5f390Alkis Evlogimenos } 38393aa52a8a96c036454be9318bb1c78c9bfb5f390Alkis Evlogimenos 3841fc8e759a767077726f9be35b93767e68bdf101fJakob Stoklund Olesen /// getSubRegIndexName - Return the human-readable symbolic target-specific 3851fc8e759a767077726f9be35b93767e68bdf101fJakob Stoklund Olesen /// name for the specified SubRegIndex. 3861fc8e759a767077726f9be35b93767e68bdf101fJakob Stoklund Olesen const char *getSubRegIndexName(unsigned SubIdx) const { 3871fc8e759a767077726f9be35b93767e68bdf101fJakob Stoklund Olesen assert(SubIdx && "This is not a subregister index"); 3881fc8e759a767077726f9be35b93767e68bdf101fJakob Stoklund Olesen return SubRegIndexNames[SubIdx-1]; 3891fc8e759a767077726f9be35b93767e68bdf101fJakob Stoklund Olesen } 3901fc8e759a767077726f9be35b93767e68bdf101fJakob Stoklund Olesen 3913f2f3f5341374c85955cfaffa71886724999762dLang Hames /// regsOverlap - Returns true if the two registers are equal or alias each 3923f2f3f5341374c85955cfaffa71886724999762dLang Hames /// other. The registers may be virtual register. 3933f2f3f5341374c85955cfaffa71886724999762dLang Hames bool regsOverlap(unsigned regA, unsigned regB) const { 3943f2f3f5341374c85955cfaffa71886724999762dLang Hames if (regA == regB) 3953f2f3f5341374c85955cfaffa71886724999762dLang Hames return true; 3963f2f3f5341374c85955cfaffa71886724999762dLang Hames 3973f2f3f5341374c85955cfaffa71886724999762dLang Hames if (isVirtualRegister(regA) || isVirtualRegister(regB)) 3983f2f3f5341374c85955cfaffa71886724999762dLang Hames return false; 3993f2f3f5341374c85955cfaffa71886724999762dLang Hames 4003f2f3f5341374c85955cfaffa71886724999762dLang Hames // regA and regB are distinct physical registers. Do they alias? 4013ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson size_t index = (regA + regB * 37) & (AliasesHashSize-1); 4023ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson unsigned ProbeAmt = 0; 4033ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson while (AliasesHash[index*2] != 0 && 4044d4eab219a96203f58452b39b4e94e234dfe4007Bill Wendling AliasesHash[index*2+1] != 0) { 4053ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson if (AliasesHash[index*2] == regA && AliasesHash[index*2+1] == regB) 4064d4eab219a96203f58452b39b4e94e234dfe4007Bill Wendling return true; 4073ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson 4083ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson index = (index + ProbeAmt) & (AliasesHashSize-1); 4093ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson ProbeAmt += 2; 4103ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson } 4113ca15c989ca0e09085648771db368d8c94ee1f19Owen Anderson 41204319bb2bda50d2ae7cc284cb1c4e742b44a466bAlkis Evlogimenos return false; 41304319bb2bda50d2ae7cc284cb1c4e742b44a466bAlkis Evlogimenos } 41404319bb2bda50d2ae7cc284cb1c4e742b44a466bAlkis Evlogimenos 415b2f2e64c0790db11aea7eb52e2d056527204ee9aEvan Cheng /// isSubRegister - Returns true if regB is a sub-register of regA. 416b2f2e64c0790db11aea7eb52e2d056527204ee9aEvan Cheng /// 417b2f2e64c0790db11aea7eb52e2d056527204ee9aEvan Cheng bool isSubRegister(unsigned regA, unsigned regB) const { 418f4f9c4f1cf4d497c63e40e6c7ef545c8c716a5ceOwen Anderson // SubregHash is a simple quadratically probed hash table. 41957ce0319b7eb4418aac910d9a094e57d983a64d2Owen Anderson size_t index = (regA + regB * 37) & (SubregHashSize-1); 420f4f9c4f1cf4d497c63e40e6c7ef545c8c716a5ceOwen Anderson unsigned ProbeAmt = 2; 421f4f9c4f1cf4d497c63e40e6c7ef545c8c716a5ceOwen Anderson while (SubregHash[index*2] != 0 && 422f4f9c4f1cf4d497c63e40e6c7ef545c8c716a5ceOwen Anderson SubregHash[index*2+1] != 0) { 423f4f9c4f1cf4d497c63e40e6c7ef545c8c716a5ceOwen Anderson if (SubregHash[index*2] == regA && SubregHash[index*2+1] == regB) 424f4f9c4f1cf4d497c63e40e6c7ef545c8c716a5ceOwen Anderson return true; 42595923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 42657ce0319b7eb4418aac910d9a094e57d983a64d2Owen Anderson index = (index + ProbeAmt) & (SubregHashSize-1); 427f4f9c4f1cf4d497c63e40e6c7ef545c8c716a5ceOwen Anderson ProbeAmt += 2; 428f4f9c4f1cf4d497c63e40e6c7ef545c8c716a5ceOwen Anderson } 42995923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 430f4f9c4f1cf4d497c63e40e6c7ef545c8c716a5ceOwen Anderson return false; 431b2f2e64c0790db11aea7eb52e2d056527204ee9aEvan Cheng } 432b2f2e64c0790db11aea7eb52e2d056527204ee9aEvan Cheng 433b2f2e64c0790db11aea7eb52e2d056527204ee9aEvan Cheng /// isSuperRegister - Returns true if regB is a super-register of regA. 434b2f2e64c0790db11aea7eb52e2d056527204ee9aEvan Cheng /// 435b2f2e64c0790db11aea7eb52e2d056527204ee9aEvan Cheng bool isSuperRegister(unsigned regA, unsigned regB) const { 43676f0ad7bf5c05d6056b3bf335d0c3fb7e72de5d6Jakob Stoklund Olesen return isSubRegister(regB, regA); 437b2f2e64c0790db11aea7eb52e2d056527204ee9aEvan Cheng } 438b2f2e64c0790db11aea7eb52e2d056527204ee9aEvan Cheng 4390098b3e2b69e527ddcf2ebad7a3081898fa3b4f0Evan Cheng /// getCalleeSavedRegs - Return a null-terminated list of all of the 4400098b3e2b69e527ddcf2ebad7a3081898fa3b4f0Evan Cheng /// callee saved registers on this target. The register should be in the 44102569d7355b03155b32c1c0d0e46f6aa957f4802Evan Cheng /// order of desired callee-save stack frame offset. The first register is 44202569d7355b03155b32c1c0d0e46f6aa957f4802Evan Cheng /// closed to the incoming stack pointer if stack grows down, and vice versa. 4432365f51ed03afe6993bae962fdc2e5a956a64cd5Anton Korobeynikov virtual const unsigned* getCalleeSavedRegs(const MachineFunction *MF = 0) 4442365f51ed03afe6993bae962fdc2e5a956a64cd5Anton Korobeynikov const = 0; 4458797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner 4468797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner 447b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng /// getReservedRegs - Returns a bitset indexed by physical register number 4481c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// indicating if a register is a special register that has particular uses 4491c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// and should be considered unavailable at all times, e.g. SP, RA. This is 4501c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// used by register scavenger to determine what registers are free. 451b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng virtual BitVector getReservedRegs(const MachineFunction &MF) const = 0; 452b371f457b0ea4a652a9f526ba4375c80ae542252Evan Cheng 4537bf1c272ab27297a7bbab329de3f17ddb26e02a3Nate Begeman /// getSubReg - Returns the physical register number of sub-register "Index" 454dd595c5998214c6ee07ed46f5db551b2abbfbbb3Evan Cheng /// for physical register RegNo. Return zero if the sub-register does not 455dd595c5998214c6ee07ed46f5db551b2abbfbbb3Evan Cheng /// exist. 4567bf1c272ab27297a7bbab329de3f17ddb26e02a3Nate Begeman virtual unsigned getSubReg(unsigned RegNo, unsigned Index) const = 0; 4577bf1c272ab27297a7bbab329de3f17ddb26e02a3Nate Begeman 458fae3e923452b85e72b2c03dd6eacc063f59d81b1Evan Cheng /// getSubRegIndex - For a given register pair, return the sub-register index 459754f680c1fcde09a3d36bb8562e1433fdb87018eBob Wilson /// if the second register is a sub-register of the first. Return zero 460fae3e923452b85e72b2c03dd6eacc063f59d81b1Evan Cheng /// otherwise. 461fae3e923452b85e72b2c03dd6eacc063f59d81b1Evan Cheng virtual unsigned getSubRegIndex(unsigned RegNo, unsigned SubRegNo) const = 0; 462fae3e923452b85e72b2c03dd6eacc063f59d81b1Evan Cheng 4638a8a0dfc3b200e193db14ea1e6f1a18bf4187866Evan Cheng /// getMatchingSuperReg - Return a super-register of the specified register 4648a8a0dfc3b200e193db14ea1e6f1a18bf4187866Evan Cheng /// Reg so its sub-register of index SubIdx is Reg. 46595923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach unsigned getMatchingSuperReg(unsigned Reg, unsigned SubIdx, 4668a8a0dfc3b200e193db14ea1e6f1a18bf4187866Evan Cheng const TargetRegisterClass *RC) const { 4678a8a0dfc3b200e193db14ea1e6f1a18bf4187866Evan Cheng for (const unsigned *SRs = getSuperRegisters(Reg); unsigned SR = *SRs;++SRs) 4688a8a0dfc3b200e193db14ea1e6f1a18bf4187866Evan Cheng if (Reg == getSubReg(SR, SubIdx) && RC->contains(SR)) 4698a8a0dfc3b200e193db14ea1e6f1a18bf4187866Evan Cheng return SR; 4708a8a0dfc3b200e193db14ea1e6f1a18bf4187866Evan Cheng return 0; 4718a8a0dfc3b200e193db14ea1e6f1a18bf4187866Evan Cheng } 4728a8a0dfc3b200e193db14ea1e6f1a18bf4187866Evan Cheng 47391a74da036d3a9442953ae1de3e797a50da4ccf0Bob Wilson /// canCombineSubRegIndices - Given a register class and a list of 47491a74da036d3a9442953ae1de3e797a50da4ccf0Bob Wilson /// subregister indices, return true if it's possible to combine the 47591a74da036d3a9442953ae1de3e797a50da4ccf0Bob Wilson /// subregister indices into one that corresponds to a larger 47691a74da036d3a9442953ae1de3e797a50da4ccf0Bob Wilson /// subregister. Return the new subregister index by reference. Note the 47791a74da036d3a9442953ae1de3e797a50da4ccf0Bob Wilson /// new index may be zero if the given subregisters can be combined to 47891a74da036d3a9442953ae1de3e797a50da4ccf0Bob Wilson /// form the whole register. 47991a74da036d3a9442953ae1de3e797a50da4ccf0Bob Wilson virtual bool canCombineSubRegIndices(const TargetRegisterClass *RC, 48091a74da036d3a9442953ae1de3e797a50da4ccf0Bob Wilson SmallVectorImpl<unsigned> &SubIndices, 48191a74da036d3a9442953ae1de3e797a50da4ccf0Bob Wilson unsigned &NewSubIdx) const { 482b990a2f249196ad3e0cc451d40a45fc2f9278eafEvan Cheng return 0; 483b990a2f249196ad3e0cc451d40a45fc2f9278eafEvan Cheng } 484b990a2f249196ad3e0cc451d40a45fc2f9278eafEvan Cheng 4855248468473f0488a652b545ad95f7abda302b7b5Evan Cheng /// getMatchingSuperRegClass - Return a subclass of the specified register 4865248468473f0488a652b545ad95f7abda302b7b5Evan Cheng /// class A so that each register in it has a sub-register of the 4875248468473f0488a652b545ad95f7abda302b7b5Evan Cheng /// specified sub-register index which is in the specified register class B. 4885248468473f0488a652b545ad95f7abda302b7b5Evan Cheng virtual const TargetRegisterClass * 4895248468473f0488a652b545ad95f7abda302b7b5Evan Cheng getMatchingSuperRegClass(const TargetRegisterClass *A, 4905248468473f0488a652b545ad95f7abda302b7b5Evan Cheng const TargetRegisterClass *B, unsigned Idx) const { 4915248468473f0488a652b545ad95f7abda302b7b5Evan Cheng return 0; 4925248468473f0488a652b545ad95f7abda302b7b5Evan Cheng } 4935248468473f0488a652b545ad95f7abda302b7b5Evan Cheng 4942da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// composeSubRegIndices - Return the subregister index you get from composing 4952da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// two subregister indices. 4962da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// 4972da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// If R:a:b is the same register as R:c, then composeSubRegIndices(a, b) 4982da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// returns c. Note that composeSubRegIndices does not tell you about illegal 4992da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// compositions. If R does not have a subreg a, or R:a does not have a subreg 5002da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// b, composeSubRegIndices doesn't tell you. 5012da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// 5022da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// The ARM register Q0 has two D subregs dsub_0:D0 and dsub_1:D1. It also has 5032da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// ssub_0:S0 - ssub_3:S3 subregs. 5042da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// If you compose subreg indices dsub_1, ssub_0 you get ssub_2. 5052da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen /// 5062da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen virtual unsigned composeSubRegIndices(unsigned a, unsigned b) const { 5072da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen // This default implementation is correct for most targets. 5082da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen return b; 5092da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen } 5102da53370241fdd1b5c291483311b34e609f06c73Jakob Stoklund Olesen 5118797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner //===--------------------------------------------------------------------===// 5128797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner // Register Class Information 5138797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner // 5148797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner 5158797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner /// Register class iterators 51692988ecdb6ca641ba39d1d1f8cbc57a89b63bbadChris Lattner /// 5178797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner regclass_iterator regclass_begin() const { return RegClassBegin; } 5188797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner regclass_iterator regclass_end() const { return RegClassEnd; } 5198797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner 5208797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner unsigned getNumRegClasses() const { 52134cd4a484e532cc463fd5a4bf59b88d13c5467c1Evan Cheng return (unsigned)(regclass_end()-regclass_begin()); 5228797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner } 52395923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 52460f09928a0d22d5927ff0a40fe9163cf1ba1014aJim Laskey /// getRegClass - Returns the register class associated with the enumeration 52560f09928a0d22d5927ff0a40fe9163cf1ba1014aJim Laskey /// value. See class TargetOperandInfo. 52660f09928a0d22d5927ff0a40fe9163cf1ba1014aJim Laskey const TargetRegisterClass *getRegClass(unsigned i) const { 527a606d955de3b0f777131d74162eb6f11b5f95d75Dan Gohman assert(i < getNumRegClasses() && "Register Class ID out of range"); 528a606d955de3b0f777131d74162eb6f11b5f95d75Dan Gohman return RegClassBegin[i]; 52960f09928a0d22d5927ff0a40fe9163cf1ba1014aJim Laskey } 5308797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner 531770bcc7b15adbc978800db70dbb1c3c22913b52cEvan Cheng /// getPointerRegClass - Returns a TargetRegisterClass used for pointer 5322cfd52c507bd5790457a171eb9bcb39019cc6860Chris Lattner /// values. If a target supports multiple different pointer register classes, 5332cfd52c507bd5790457a171eb9bcb39019cc6860Chris Lattner /// kind specifies which one is indicated. 5342cfd52c507bd5790457a171eb9bcb39019cc6860Chris Lattner virtual const TargetRegisterClass *getPointerRegClass(unsigned Kind=0) const { 535770bcc7b15adbc978800db70dbb1c3c22913b52cEvan Cheng assert(0 && "Target didn't implement getPointerRegClass!"); 536770bcc7b15adbc978800db70dbb1c3c22913b52cEvan Cheng return 0; // Must return a value in order to compile with VS 2005 537770bcc7b15adbc978800db70dbb1c3c22913b52cEvan Cheng } 5388797caac84c3012416e933c9c05ad34d75bf4029Chris Lattner 539ff110265753c19daf0468ee1facf357460497b7eEvan Cheng /// getCrossCopyRegClass - Returns a legal register class to copy a register 540ff110265753c19daf0468ee1facf357460497b7eEvan Cheng /// in the specified class to or from. Returns NULL if it is possible to copy 541ff110265753c19daf0468ee1facf357460497b7eEvan Cheng /// between a two registers of the specified class. 542ff110265753c19daf0468ee1facf357460497b7eEvan Cheng virtual const TargetRegisterClass * 543ff110265753c19daf0468ee1facf357460497b7eEvan Cheng getCrossCopyRegClass(const TargetRegisterClass *RC) const { 544ff110265753c19daf0468ee1facf357460497b7eEvan Cheng return NULL; 545ff110265753c19daf0468ee1facf357460497b7eEvan Cheng } 546ff110265753c19daf0468ee1facf357460497b7eEvan Cheng 547358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng /// getAllocationOrder - Returns the register allocation order for a specified 548358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng /// register class in the form of a pair of TargetRegisterClass iterators. 549358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng virtual std::pair<TargetRegisterClass::iterator,TargetRegisterClass::iterator> 550358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng getAllocationOrder(const TargetRegisterClass *RC, 551f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng unsigned HintType, unsigned HintReg, 552358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng const MachineFunction &MF) const { 553358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng return std::make_pair(RC->allocation_order_begin(MF), 554358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng RC->allocation_order_end(MF)); 555358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng } 556358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng 557358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng /// ResolveRegAllocHint - Resolves the specified register allocation hint 558358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng /// to a physical register. Returns the physical register if it is successful. 559f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng virtual unsigned ResolveRegAllocHint(unsigned Type, unsigned Reg, 560f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng const MachineFunction &MF) const { 561358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng if (Type == 0 && Reg && isPhysicalRegister(Reg)) 562358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng return Reg; 563358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng return 0; 564358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng } 565358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng 566f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng /// UpdateRegAllocHint - A callback to allow target a chance to update 567f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng /// register allocation hints when a register is "changed" (e.g. coalesced) 568f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng /// to another register. e.g. On ARM, some virtual registers should target 569f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng /// register pairs, if one of pair is coalesced to another register, the 570f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng /// allocation hint of the other half of the pair should be changed to point 571f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng /// to the new register. 572f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng virtual void UpdateRegAllocHint(unsigned Reg, unsigned NewReg, 573f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng MachineFunction &MF) const { 574f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng // Do nothing. 575f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng } 576f9f1da17f8bd6ffb2df62ce3cb933f0ee63f8da4Evan Cheng 5771c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// targetHandlesStackFrameRounding - Returns true if the target is 5781c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// responsible for rounding up the stack frame (probably at emitPrologue 5791c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// time). 58002a20291410a6814c657b69901a57103d4861a07Evan Cheng virtual bool targetHandlesStackFrameRounding() const { 58102a20291410a6814c657b69901a57103d4861a07Evan Cheng return false; 58202a20291410a6814c657b69901a57103d4861a07Evan Cheng } 58302a20291410a6814c657b69901a57103d4861a07Evan Cheng 5841c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// requiresRegisterScavenging - returns true if the target requires (and can 5851c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// make use of) the register scavenger. 58636230cdda48edf6c634f2dcf69f9d78ac5a17377Evan Cheng virtual bool requiresRegisterScavenging(const MachineFunction &MF) const { 58737f15a6d488d256d371f6c39ab83837bc9c0772dEvan Cheng return false; 58837f15a6d488d256d371f6c39ab83837bc9c0772dEvan Cheng } 58995923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 59065c58daa8b8985d2116216043103009815a55e77Jim Grosbach /// requiresFrameIndexScavenging - returns true if the target requires post 59165c58daa8b8985d2116216043103009815a55e77Jim Grosbach /// PEI scavenging of registers for materializing frame index constants. 59265c58daa8b8985d2116216043103009815a55e77Jim Grosbach virtual bool requiresFrameIndexScavenging(const MachineFunction &MF) const { 59365c58daa8b8985d2116216043103009815a55e77Jim Grosbach return false; 59465c58daa8b8985d2116216043103009815a55e77Jim Grosbach } 59565c58daa8b8985d2116216043103009815a55e77Jim Grosbach 5961c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// hasFP - Return true if the specified function should have a dedicated 5971c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// frame pointer register. For most targets this is true only if the function 5981c08eba3fb44d59176ca1e3bfefce42e7f47d5ecBill Wendling /// has variable sized allocas or if frame pointer elimination is disabled. 599dc77540d9506dc151d79b94bae88bd841880ef37Evan Cheng virtual bool hasFP(const MachineFunction &MF) const = 0; 600dc77540d9506dc151d79b94bae88bd841880ef37Evan Cheng 601910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// hasReservedCallFrame - Under normal circumstances, when a frame pointer is 602910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// not required, we reserve argument space for call sites in the function 603910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// immediately on entry to the current function. This eliminates the need for 604910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// add/sub sp brackets around call sites. Returns true if the call frame is 605910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// included as part of the stack frame. 60672852a8cfb605056d87b644d2e36b1346051413dEric Christopher virtual bool hasReservedCallFrame(const MachineFunction &MF) const { 60714f1dd120fc13200697560680999c0efe7ecd714Evan Cheng return !hasFP(MF); 60814f1dd120fc13200697560680999c0efe7ecd714Evan Cheng } 60914f1dd120fc13200697560680999c0efe7ecd714Evan Cheng 6104642ad3af1cf508ac320b9afd25b065f08b36574Jim Grosbach /// canSimplifyCallFramePseudos - When possible, it's best to simplify the 6114642ad3af1cf508ac320b9afd25b065f08b36574Jim Grosbach /// call frame pseudo ops before doing frame index elimination. This is 6124642ad3af1cf508ac320b9afd25b065f08b36574Jim Grosbach /// possible only when frame index references between the pseudos won't 613735317c0e83bd52bd3ab3e6d574a0640f722af47Eric Christopher /// need adjusting for the call frame adjustments. Normally, that's true 6144642ad3af1cf508ac320b9afd25b065f08b36574Jim Grosbach /// if the function has a reserved call frame or a frame pointer. Some 6154642ad3af1cf508ac320b9afd25b065f08b36574Jim Grosbach /// targets (Thumb2, for example) may have more complicated criteria, 6164642ad3af1cf508ac320b9afd25b065f08b36574Jim Grosbach /// however, and can override this behavior. 61772852a8cfb605056d87b644d2e36b1346051413dEric Christopher virtual bool canSimplifyCallFramePseudos(const MachineFunction &MF) const { 6184642ad3af1cf508ac320b9afd25b065f08b36574Jim Grosbach return hasReservedCallFrame(MF) || hasFP(MF); 6194642ad3af1cf508ac320b9afd25b065f08b36574Jim Grosbach } 6204642ad3af1cf508ac320b9afd25b065f08b36574Jim Grosbach 621910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// hasReservedSpillSlot - Return true if target has reserved a spill slot in 622910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// the stack frame of the given function for the specified register. e.g. On 623910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// x86, if the frame register is required, the first fixed stack object is 624910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// reserved as its spill slot. This tells PEI not to create a new stack frame 625910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// object for the given register. It should be called only after 626910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// processFunctionBeforeCalleeSavedScan(). 62772852a8cfb605056d87b644d2e36b1346051413dEric Christopher virtual bool hasReservedSpillSlot(const MachineFunction &MF, unsigned Reg, 628910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng int &FrameIdx) const { 629910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng return false; 630910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng } 631910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng 632910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// needsStackRealignment - true if storage within the function requires the 633910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// stack pointer to be aligned more than the normal calling convention calls 634910139f9ca53fc20a680d51ae61bb1e072095141Evan Cheng /// for. 635b5dae003252d8e650a32bfdf33cba5aed8e41e40Dale Johannesen virtual bool needsStackRealignment(const MachineFunction &MF) const { 636b5dae003252d8e650a32bfdf33cba5aed8e41e40Dale Johannesen return false; 637b5dae003252d8e650a32bfdf33cba5aed8e41e40Dale Johannesen } 638b5dae003252d8e650a32bfdf33cba5aed8e41e40Dale Johannesen 6398708ead5a46f4ec8f2d5f832be23381924d72b8dJim Grosbach /// needsFrameBaseReg - Returns true if the instruction's frame index 6408708ead5a46f4ec8f2d5f832be23381924d72b8dJim Grosbach /// reference would be better served by a base register other than FP 6418708ead5a46f4ec8f2d5f832be23381924d72b8dJim Grosbach /// or SP. Used by LocalStackFrameAllocation to determine which frame index 6428708ead5a46f4ec8f2d5f832be23381924d72b8dJim Grosbach /// references it should create new base registers for. 6438708ead5a46f4ec8f2d5f832be23381924d72b8dJim Grosbach virtual bool needsFrameBaseReg(MachineInstr *MI, unsigned operand) const { 6448708ead5a46f4ec8f2d5f832be23381924d72b8dJim Grosbach return false; 6458708ead5a46f4ec8f2d5f832be23381924d72b8dJim Grosbach } 6468708ead5a46f4ec8f2d5f832be23381924d72b8dJim Grosbach 647dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach /// materializeFrameBaseRegister - Insert defining instruction(s) for 648dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach /// BaseReg to be a pointer to FrameIdx before insertion point I. 649dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach virtual void materializeFrameBaseRegister(MachineBasicBlock::iterator I, 650dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach unsigned BaseReg, 651dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach int FrameIdx) const { 652dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach assert(0 && "materializeFrameBaseRegister does not exist on this target"); 653dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach } 654dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach 655dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach /// resolveFrameIndex - Resolve a frame index operand of an instruction 656dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach /// to reference the indicated base register plus offset instead. 657dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach virtual void resolveFrameIndex(MachineBasicBlock::iterator I, 658dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach unsigned BaseReg, int64_t Offset) const { 659dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach assert(0 && "resolveFrameIndex does not exist on this target"); 660dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach } 661dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach 662dc140c6e7b8350ca51aa1d408c10e25a27826e2cJim Grosbach 663f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// getCallFrameSetup/DestroyOpcode - These methods return the opcode of the 664f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// frame setup/destroy instructions if they exist (-1 otherwise). Some 665f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// targets use pseudo instructions in order to abstract away the difference 666f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// between operating with a frame pointer and operating without, through the 667f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// use of these two instructions. 668f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// 669f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner int getCallFrameSetupOpcode() const { return CallFrameSetupOpcode; } 670f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner int getCallFrameDestroyOpcode() const { return CallFrameDestroyOpcode; } 671f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner 672f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// eliminateCallFramePseudoInstr - This method is called during prolog/epilog 673f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// code insertion to eliminate call frame setup and destroy pseudo 674f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// instructions (but only if the Target is using them). It is responsible 675f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// for eliminating these instructions, replacing them with concrete 676f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// instructions. This method need only be implemented if using call frame 6778a1478b6d7aeaed8363316d2e0b90d9f53525c29Chris Lattner /// setup/destroy pseudo instructions. 678f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// 67934695381d626485a560594f162701088079589dfMisha Brukman virtual void 6808604e7572132e8728a1e20d53965bc4ab6986818Chris Lattner eliminateCallFramePseudoInstr(MachineFunction &MF, 6818604e7572132e8728a1e20d53965bc4ab6986818Chris Lattner MachineBasicBlock &MBB, 6828604e7572132e8728a1e20d53965bc4ab6986818Chris Lattner MachineBasicBlock::iterator MI) const { 683f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner assert(getCallFrameSetupOpcode()== -1 && getCallFrameDestroyOpcode()== -1 && 68400876a2808f1a8061f7e0852c7949fc5074ecb04Misha Brukman "eliminateCallFramePseudoInstr must be implemented if using" 68500876a2808f1a8061f7e0852c7949fc5074ecb04Misha Brukman " call frame setup/destroy pseudo instructions!"); 686f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner assert(0 && "Call Frame Pseudo Instructions do not exist on this target!"); 687f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner } 688f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner 6890098b3e2b69e527ddcf2ebad7a3081898fa3b4f0Evan Cheng /// processFunctionBeforeCalleeSavedScan - This method is called immediately 69002569d7355b03155b32c1c0d0e46f6aa957f4802Evan Cheng /// before PrologEpilogInserter scans the physical registers used to determine 6910098b3e2b69e527ddcf2ebad7a3081898fa3b4f0Evan Cheng /// what callee saved registers should be spilled. This method is optional. 69228b3c45109153bc50d3d9e97dccb25ffd043fa50Evan Cheng virtual void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, 69328b3c45109153bc50d3d9e97dccb25ffd043fa50Evan Cheng RegScavenger *RS = NULL) const { 69428b3c45109153bc50d3d9e97dccb25ffd043fa50Evan Cheng 69502569d7355b03155b32c1c0d0e46f6aa957f4802Evan Cheng } 69602569d7355b03155b32c1c0d0e46f6aa957f4802Evan Cheng 697f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// processFunctionBeforeFrameFinalized - This method is called immediately 698e6f60645c7aa208e03b3804bcf8489e08dacff0aJim Grosbach /// before the specified function's frame layout (MF.getFrameInfo()) is 699f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// finalized. Once the frame is finalized, MO_FrameIndex operands are 70002569d7355b03155b32c1c0d0e46f6aa957f4802Evan Cheng /// replaced with direct constants. This method is optional. 701f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// 7028604e7572132e8728a1e20d53965bc4ab6986818Chris Lattner virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const { 703e668dab5b339df01920b8bff890a70455b7dd27aAlkis Evlogimenos } 704f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner 705d482f55af135081aee7f7ab972bb8973f189c88fJim Grosbach /// saveScavengerRegister - Spill the register so it can be used by the 706d482f55af135081aee7f7ab972bb8973f189c88fJim Grosbach /// register scavenger. Return true if the register was spilled, false 707d482f55af135081aee7f7ab972bb8973f189c88fJim Grosbach /// otherwise. If this function does not spill the register, the scavenger 708540b05d227a79443b2a7b07d5152a35cb6392abfJim Grosbach /// will instead spill it to the emergency spill slot. 709540b05d227a79443b2a7b07d5152a35cb6392abfJim Grosbach /// 710540b05d227a79443b2a7b07d5152a35cb6392abfJim Grosbach virtual bool saveScavengerRegister(MachineBasicBlock &MBB, 711540b05d227a79443b2a7b07d5152a35cb6392abfJim Grosbach MachineBasicBlock::iterator I, 712d482f55af135081aee7f7ab972bb8973f189c88fJim Grosbach MachineBasicBlock::iterator &UseMI, 713540b05d227a79443b2a7b07d5152a35cb6392abfJim Grosbach const TargetRegisterClass *RC, 7141f8f4d2db734d9881467a5706acac73660842d43Evan Cheng unsigned Reg) const { 7151f8f4d2db734d9881467a5706acac73660842d43Evan Cheng return false; 7161f8f4d2db734d9881467a5706acac73660842d43Evan Cheng } 717540b05d227a79443b2a7b07d5152a35cb6392abfJim Grosbach 718f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// eliminateFrameIndex - This method must be overriden to eliminate abstract 719f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// frame indices from instructions which may use them. The instruction 720f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// referenced by the iterator contains an MO_FrameIndex operand which must be 721f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// eliminated by this method. This method may modify or replace the 722c49a10aca1e31351c2e11b25ba636a23b93c46c8Dale Johannesen /// specified instruction, as long as it keeps the iterator pointing at the 72318b111bffe643b5ad52ae10a1d5728b0c1ac92f0Evan Cheng /// finished product. SPAdj is the SP adjustment due to call frame setup 7241ad70c09c890c3abcc147503f2e23082f683790cMatthijs Kooijman /// instruction. 725b58f498f7502e7e1833decbbbb4df771367c7341Jim Grosbach /// 726b58f498f7502e7e1833decbbbb4df771367c7341Jim Grosbach /// When -enable-frame-index-scavenging is enabled, the virtual register 727b58f498f7502e7e1833decbbbb4df771367c7341Jim Grosbach /// allocated for this frame index is returned and its value is stored in 728b58f498f7502e7e1833decbbbb4df771367c7341Jim Grosbach /// *Value. 729dff4b4c5a7cc894d3b4b6c6e779ea8f47fa50630Jim Grosbach typedef std::pair<unsigned, int> FrameIndexValue; 730b58f498f7502e7e1833decbbbb4df771367c7341Jim Grosbach virtual unsigned eliminateFrameIndex(MachineBasicBlock::iterator MI, 731dff4b4c5a7cc894d3b4b6c6e779ea8f47fa50630Jim Grosbach int SPAdj, FrameIndexValue *Value = NULL, 732b58f498f7502e7e1833decbbbb4df771367c7341Jim Grosbach RegScavenger *RS=NULL) const = 0; 733f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner 734f9b332b59d1c008268551572557dca6ab6028a4dChris Lattner /// emitProlog/emitEpilog - These methods insert prolog and epilog code into 735854255361ed5a8f009d64c4869ed2a85cf0d8faeMatthijs Kooijman /// the function. 7368604e7572132e8728a1e20d53965bc4ab6986818Chris Lattner virtual void emitPrologue(MachineFunction &MF) const = 0; 7378604e7572132e8728a1e20d53965bc4ab6986818Chris Lattner virtual void emitEpilogue(MachineFunction &MF, 7388604e7572132e8728a1e20d53965bc4ab6986818Chris Lattner MachineBasicBlock &MBB) const = 0; 73995923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 740a99791886d5d4af2b900cd8cc1c9ed1677b6f0f4Jim Laskey //===--------------------------------------------------------------------===// 741a99791886d5d4af2b900cd8cc1c9ed1677b6f0f4Jim Laskey /// Debug information queries. 74295923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 7434188699f80c233a20b6ddc61570a8a8c1804cb85Jim Laskey /// getDwarfRegNum - Map a target register to an equivalent dwarf register 744b97aec663b1591e71c9ddee6dbb327d1b827eda5Dale Johannesen /// number. Returns -1 if there is no equivalent value. The second 745b97aec663b1591e71c9ddee6dbb327d1b827eda5Dale Johannesen /// parameter allows targets to use different numberings for EH info and 7462bbeccdee1937f6cef9f8762595246f447162a4fMatthijs Kooijman /// debugging info. 747b97aec663b1591e71c9ddee6dbb327d1b827eda5Dale Johannesen virtual int getDwarfRegNum(unsigned RegNum, bool isEH) const = 0; 748a99791886d5d4af2b900cd8cc1c9ed1677b6f0f4Jim Laskey 749a99791886d5d4af2b900cd8cc1c9ed1677b6f0f4Jim Laskey /// getFrameRegister - This method should return the register used as a base 7504188699f80c233a20b6ddc61570a8a8c1804cb85Jim Laskey /// for values allocated in the current stack frame. 751b9c2fd964ee7dd7823ac71db8443055e4d0f1c15David Greene virtual unsigned getFrameRegister(const MachineFunction &MF) const = 0; 75272bebb9205c1628601b052d25555aabe6e15e6f4Evan Cheng 75372bebb9205c1628601b052d25555aabe6e15e6f4Evan Cheng /// getFrameIndexOffset - Returns the displacement from the frame register to 75472bebb9205c1628601b052d25555aabe6e15e6f4Evan Cheng /// the stack frame of the specified index. 75530c6b75ac2eef548c18110a38c9798ea5314cabaChris Lattner virtual int getFrameIndexOffset(const MachineFunction &MF, int FI) const; 75695923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 757a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach /// getFrameIndexReference - This method should return the base register 758a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach /// and offset used to reference a frame index location. The offset is 759a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach /// returned directly, and the base register is returned via FrameReg. 76030c6b75ac2eef548c18110a38c9798ea5314cabaChris Lattner virtual int getFrameIndexReference(const MachineFunction &MF, int FI, 761a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach unsigned &FrameReg) const { 762a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach // By default, assume all frame indices are referenced via whatever 763a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach // getFrameRegister() says. The target can override this if it's doing 764a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach // something different. 765a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach FrameReg = getFrameRegister(MF); 766a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach return getFrameIndexOffset(MF, FI); 767a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach } 768a2f20b20a8dc7f053599840557405554a0848aecJim Grosbach 7694188699f80c233a20b6ddc61570a8a8c1804cb85Jim Laskey /// getRARegister - This method should return the register where the return 7704188699f80c233a20b6ddc61570a8a8c1804cb85Jim Laskey /// address can be found. 7714188699f80c233a20b6ddc61570a8a8c1804cb85Jim Laskey virtual unsigned getRARegister() const = 0; 77295923d70d90e0b9901d63ec3e35bf94be260e4f0Jim Grosbach 7734188699f80c233a20b6ddc61570a8a8c1804cb85Jim Laskey /// getInitialFrameState - Returns a list of machine moves that are assumed 7744188699f80c233a20b6ddc61570a8a8c1804cb85Jim Laskey /// on entry to all functions. Note that LabelID is ignored (assumed to be 7754188699f80c233a20b6ddc61570a8a8c1804cb85Jim Laskey /// the beginning of the function.) 7765e73d5bd2e98afda12fa69a7ea83050c69be0d34Jim Laskey virtual void getInitialFrameState(std::vector<MachineMove> &Moves) const; 7773d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner}; 7783d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner 779c781a243a3d17e7e763515794168d8fa6043f565Evan Cheng 78094c002a190cd2e3a52b1510bc997e53d63af0b3bChris Lattner// This is useful when building IndexedMaps keyed on virtual registers 78159bf4fcc0680e75b408579064d1205a132361196Duncan Sandsstruct VirtReg2IndexFunctor : public std::unary_function<unsigned, unsigned> { 7824d0d864be3d9a698c4edfe36961a22126f041298Alkis Evlogimenos unsigned operator()(unsigned Reg) const { 7836f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman return Reg - TargetRegisterInfo::FirstVirtualRegister; 7844d0d864be3d9a698c4edfe36961a22126f041298Alkis Evlogimenos } 7854d0d864be3d9a698c4edfe36961a22126f041298Alkis Evlogimenos}; 7864d0d864be3d9a698c4edfe36961a22126f041298Alkis Evlogimenos 787c781a243a3d17e7e763515794168d8fa6043f565Evan Cheng/// getCommonSubClass - find the largest common subclass of A and B. Return NULL 788c781a243a3d17e7e763515794168d8fa6043f565Evan Cheng/// if there is no common subclass. 789c781a243a3d17e7e763515794168d8fa6043f565Evan Chengconst TargetRegisterClass *getCommonSubClass(const TargetRegisterClass *A, 790c781a243a3d17e7e763515794168d8fa6043f565Evan Cheng const TargetRegisterClass *B); 791c781a243a3d17e7e763515794168d8fa6043f565Evan Cheng 792d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke} // End llvm namespace 793d0fde30ce850b78371fd1386338350591f9ff494Brian Gaeke 7943d7771a387d9476cfb25451ab95b72ce7b3e2532Chris Lattner#endif 795