MachineRegisterInfo.h revision e6dc59891fc53d65b3f6d19772d26e23e0cc1cac
184bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner//===-- llvm/CodeGen/MachineRegisterInfo.h ----------------------*- C++ -*-===// 284bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// 384bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// The LLVM Compiler Infrastructure 484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// 584bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// This file is distributed under the University of Illinois Open Source 684bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// License. See LICENSE.TXT for details. 784bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// 884bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner//===----------------------------------------------------------------------===// 984bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// 1084bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// This file defines the MachineRegisterInfo class. 1184bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner// 1284bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner//===----------------------------------------------------------------------===// 1384bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner 1484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner#ifndef LLVM_CODEGEN_MACHINEREGISTERINFO_H 1584bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner#define LLVM_CODEGEN_MACHINEREGISTERINFO_H 1684bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner 1784bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner#include "llvm/ADT/BitVector.h" 18994c727b5790e5c976e32c75364d78eb9b22a568Jakob Stoklund Olesen#include "llvm/ADT/IndexedMap.h" 19255f89faee13dc491cb64fbeae3c763e7e2ea4e6Chandler Carruth#include "llvm/CodeGen/MachineInstrBundle.h" 20255f89faee13dc491cb64fbeae3c763e7e2ea4e6Chandler Carruth#include "llvm/Target/TargetRegisterInfo.h" 2184bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner#include <vector> 2284bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner 2384bc5427d6883f73cfeae3da640acd011d35c006Chris Lattnernamespace llvm { 2490019479f9a3868d8be90564695097a61a725438Andrew Trick 251213d672653d7fee471d91d05b559e137d70ba56Chris Lattner/// MachineRegisterInfo - Keep track of information for virtual and physical 261213d672653d7fee471d91d05b559e137d70ba56Chris Lattner/// registers, including vreg register classes, use/def chains for registers, 271213d672653d7fee471d91d05b559e137d70ba56Chris Lattner/// etc. 2884bc5427d6883f73cfeae3da640acd011d35c006Chris Lattnerclass MachineRegisterInfo { 29e27e1ca3c90b69e78242c98a669337f84ccded7fJakob Stoklund Olesen const TargetRegisterInfo *const TRI; 30e27e1ca3c90b69e78242c98a669337f84ccded7fJakob Stoklund Olesen 3173e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen /// IsSSA - True when the machine function is in SSA form and virtual 3273e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen /// registers have a single def. 3373e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen bool IsSSA; 3473e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen 35aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// TracksLiveness - True while register liveness is being tracked accurately. 36aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// Basic block live-in lists, kill flags, and implicit defs may not be 37aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// accurate when after this flag is cleared. 38aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen bool TracksLiveness; 39aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen 40994c727b5790e5c976e32c75364d78eb9b22a568Jakob Stoklund Olesen /// VRegInfo - Information we keep for each virtual register. 4162ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner /// 4262ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner /// Each element in this list contains the register class of the vreg and the 4362ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner /// start of the use/def list for the register. 44994c727b5790e5c976e32c75364d78eb9b22a568Jakob Stoklund Olesen IndexedMap<std::pair<const TargetRegisterClass*, MachineOperand*>, 45994c727b5790e5c976e32c75364d78eb9b22a568Jakob Stoklund Olesen VirtReg2IndexFunctor> VRegInfo; 4611a26f3697ea6520022ea6d3fa6a07b3c1b988cdEvan Cheng 4790f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng /// RegAllocHints - This vector records register allocation hints for virtual 48358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng /// registers. For each virtual register, it keeps a register and hint type 49358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng /// pair making up the allocation hint. Hint type is target specific except 50358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng /// for the value 0 which means the second value of the pair is the preferred 51358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng /// register for allocation. For example, if the hint is <0, 1024>, it means 52358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng /// the allocator should prefer the physical register allocated to the virtual 5390f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng /// register of the hint. 54994c727b5790e5c976e32c75364d78eb9b22a568Jakob Stoklund Olesen IndexedMap<std::pair<unsigned, unsigned>, VirtReg2IndexFunctor> RegAllocHints; 5590019479f9a3868d8be90564695097a61a725438Andrew Trick 5662ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner /// PhysRegUseDefLists - This is an array of the head of the use/def list for 5762ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner /// physical registers. 5890019479f9a3868d8be90564695097a61a725438Andrew Trick MachineOperand **PhysRegUseDefLists; 5990019479f9a3868d8be90564695097a61a725438Andrew Trick 60ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen /// getRegUseDefListHead - Return the head pointer for the register use/def 61ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen /// list for the specified virtual or physical register. 62ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen MachineOperand *&getRegUseDefListHead(unsigned RegNo) { 63ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen if (TargetRegisterInfo::isVirtualRegister(RegNo)) 64ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen return VRegInfo[RegNo].second; 65ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen return PhysRegUseDefLists[RegNo]; 66ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen } 67ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen 68ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen MachineOperand *getRegUseDefListHead(unsigned RegNo) const { 69ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen if (TargetRegisterInfo::isVirtualRegister(RegNo)) 70ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen return VRegInfo[RegNo].second; 71ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen return PhysRegUseDefLists[RegNo]; 72ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen } 73ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen 74fdd6484b41ef0fa7eb8c995fb34b728b193c6258Jakob Stoklund Olesen /// Get the next element in the use-def chain. 75fdd6484b41ef0fa7eb8c995fb34b728b193c6258Jakob Stoklund Olesen static MachineOperand *getNextOperandForReg(const MachineOperand *MO) { 76fdd6484b41ef0fa7eb8c995fb34b728b193c6258Jakob Stoklund Olesen assert(MO && MO->isReg() && "This is not a register operand!"); 77fdd6484b41ef0fa7eb8c995fb34b728b193c6258Jakob Stoklund Olesen return MO->Contents.Reg.Next; 78fdd6484b41ef0fa7eb8c995fb34b728b193c6258Jakob Stoklund Olesen } 79fdd6484b41ef0fa7eb8c995fb34b728b193c6258Jakob Stoklund Olesen 804b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen /// UsedRegUnits - This is a bit vector that is computed and set by the 8184bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// register allocator, and must be kept up to date by passes that run after 8284bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// register allocation (though most don't modify this). This is used 8384bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// so that the code generator knows which callee save registers to save and 8484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// for other target specific uses. 854b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen /// This vector has bits set for register units that are modified in the 864b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen /// current function. It doesn't include registers clobbered by function 874b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen /// calls with register mask operands. 884b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen BitVector UsedRegUnits; 894b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen 904b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen /// UsedPhysRegMask - Additional used physregs including aliases. 914b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen /// This bit vector represents all the registers clobbered by function calls. 924b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen /// It can model things that UsedRegUnits can't, such as function calls that 934b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen /// clobber ymm7 but preserve the low half in xmm7. 94d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen BitVector UsedPhysRegMask; 95d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen 96d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// ReservedRegs - This is a bit vector of reserved registers. The target 97d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// may change its mind about which registers should be reserved. This 98d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// vector is the frozen set of reserved registers when register allocation 99d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// started. 100d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen BitVector ReservedRegs; 101d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen 102e6dc59891fc53d65b3f6d19772d26e23e0cc1cacJakob Stoklund Olesen /// Keep track of the physical registers that are live in to the function. 103e6dc59891fc53d65b3f6d19772d26e23e0cc1cacJakob Stoklund Olesen /// Live in values are typically arguments in registers, live out values are 104e6dc59891fc53d65b3f6d19772d26e23e0cc1cacJakob Stoklund Olesen /// typically return values in registers. LiveIn values are allowed to have 105e6dc59891fc53d65b3f6d19772d26e23e0cc1cacJakob Stoklund Olesen /// virtual registers associated with them, stored in the second element. 10684bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner std::vector<std::pair<unsigned, unsigned> > LiveIns; 10790019479f9a3868d8be90564695097a61a725438Andrew Trick 108001d3dc976d7cda8a3dd8c7fd4020b0b96033f4eCraig Topper MachineRegisterInfo(const MachineRegisterInfo&) LLVM_DELETED_FUNCTION; 109001d3dc976d7cda8a3dd8c7fd4020b0b96033f4eCraig Topper void operator=(const MachineRegisterInfo&) LLVM_DELETED_FUNCTION; 11084bc5427d6883f73cfeae3da640acd011d35c006Chris Lattnerpublic: 1116f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman explicit MachineRegisterInfo(const TargetRegisterInfo &TRI); 11262ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner ~MachineRegisterInfo(); 11373e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen 11473e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen //===--------------------------------------------------------------------===// 11573e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen // Function State 11673e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen //===--------------------------------------------------------------------===// 11773e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen 11873e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen // isSSA - Returns true when the machine function is in SSA form. Early 11973e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen // passes require the machine function to be in SSA form where every virtual 12073e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen // register has a single defining instruction. 12173e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen // 12273e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen // The TwoAddressInstructionPass and PHIElimination passes take the machine 12373e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen // function out of SSA form when they introduce multiple defs per virtual 12473e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen // register. 12573e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen bool isSSA() const { return IsSSA; } 12673e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen 12773e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen // leaveSSA - Indicates that the machine function is no longer in SSA form. 12873e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen void leaveSSA() { IsSSA = false; } 12973e7dced3892f2abb4344526147d4df0f62aee61Jakob Stoklund Olesen 130aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// tracksLiveness - Returns true when tracking register liveness accurately. 131aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// 132aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// While this flag is true, register liveness information in basic block 133aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// live-in lists and machine instruction operands is accurate. This means it 134aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// can be used to change the code in ways that affect the values in 135aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// registers, for example by the register scavenger. 136aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// 137aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// When this flag is false, liveness is no longer reliable. 138aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen bool tracksLiveness() const { return TracksLiveness; } 139aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen 140aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// invalidateLiveness - Indicates that register liveness is no longer being 141aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// tracked accurately. 142aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// 143aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// This should be called by late passes that invalidate the liveness 144aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen /// information. 145aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen void invalidateLiveness() { TracksLiveness = false; } 146aba6559370c3d453588103fb667ffa3b11b76652Jakob Stoklund Olesen 1476c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner //===--------------------------------------------------------------------===// 1486c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner // Register Info 1496c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner //===--------------------------------------------------------------------===// 1506c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner 151ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen // Strictly for use by MachineInstr.cpp. 152ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen void addRegOperandToUseList(MachineOperand *MO); 153ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen 154ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen // Strictly for use by MachineInstr.cpp. 155ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen void removeRegOperandFromUseList(MachineOperand *MO); 156ff2b99afc8cbc6cfa73181072888e0f9f07deb7eJakob Stoklund Olesen 157bced5cd924e47818d67e33b3ae1550ab96fc239aJakob Stoklund Olesen // Strictly for use by MachineInstr.cpp. 158bced5cd924e47818d67e33b3ae1550ab96fc239aJakob Stoklund Olesen void moveOperands(MachineOperand *Dst, MachineOperand *Src, unsigned NumOps); 159bced5cd924e47818d67e33b3ae1550ab96fc239aJakob Stoklund Olesen 1606c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner /// reg_begin/reg_end - Provide iteration support to walk over all definitions 1616c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner /// and uses of a register within the MachineFunction that corresponds to this 1626c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner /// MachineRegisterInfo object. 163a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen template<bool Uses, bool Defs, bool SkipDebug> 164c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner class defusechain_iterator; 165c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner 166fdd6484b41ef0fa7eb8c995fb34b728b193c6258Jakob Stoklund Olesen // Make it a friend so it can access getNextOperandForReg(). 167fdd6484b41ef0fa7eb8c995fb34b728b193c6258Jakob Stoklund Olesen template<bool, bool, bool> friend class defusechain_iterator; 168fdd6484b41ef0fa7eb8c995fb34b728b193c6258Jakob Stoklund Olesen 169c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner /// reg_iterator/reg_begin/reg_end - Walk all defs and uses of the specified 170c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner /// register. 171a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen typedef defusechain_iterator<true,true,false> reg_iterator; 1726c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner reg_iterator reg_begin(unsigned RegNo) const { 1736c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner return reg_iterator(getRegUseDefListHead(RegNo)); 1746c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner } 1756c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner static reg_iterator reg_end() { return reg_iterator(0); } 176c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner 17700ffd505d327782eb51fa55e47967fd8e62ba40aDan Gohman /// reg_empty - Return true if there are no instructions using or defining the 17800ffd505d327782eb51fa55e47967fd8e62ba40aDan Gohman /// specified register (it may be live-in). 17900ffd505d327782eb51fa55e47967fd8e62ba40aDan Gohman bool reg_empty(unsigned RegNo) const { return reg_begin(RegNo) == reg_end(); } 18000ffd505d327782eb51fa55e47967fd8e62ba40aDan Gohman 181c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen /// reg_nodbg_iterator/reg_nodbg_begin/reg_nodbg_end - Walk all defs and uses 182c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen /// of the specified register, skipping those marked as Debug. 183c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen typedef defusechain_iterator<true,true,true> reg_nodbg_iterator; 184c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen reg_nodbg_iterator reg_nodbg_begin(unsigned RegNo) const { 185c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen return reg_nodbg_iterator(getRegUseDefListHead(RegNo)); 186c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen } 187c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen static reg_nodbg_iterator reg_nodbg_end() { return reg_nodbg_iterator(0); } 188c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen 189c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen /// reg_nodbg_empty - Return true if the only instructions using or defining 190c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen /// Reg are Debug instructions. 191c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen bool reg_nodbg_empty(unsigned RegNo) const { 192c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen return reg_nodbg_begin(RegNo) == reg_nodbg_end(); 193c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen } 194c66c78c6846631a9f6a44fee69d218f900e63140Jakob Stoklund Olesen 195c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner /// def_iterator/def_begin/def_end - Walk all defs of the specified register. 196a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen typedef defusechain_iterator<false,true,false> def_iterator; 197c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner def_iterator def_begin(unsigned RegNo) const { 198c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner return def_iterator(getRegUseDefListHead(RegNo)); 199c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner } 200c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner static def_iterator def_end() { return def_iterator(0); } 201c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner 20200ffd505d327782eb51fa55e47967fd8e62ba40aDan Gohman /// def_empty - Return true if there are no instructions defining the 20300ffd505d327782eb51fa55e47967fd8e62ba40aDan Gohman /// specified register (it may be live-in). 20400ffd505d327782eb51fa55e47967fd8e62ba40aDan Gohman bool def_empty(unsigned RegNo) const { return def_begin(RegNo) == def_end(); } 20500ffd505d327782eb51fa55e47967fd8e62ba40aDan Gohman 2060492a8c530df6c7b2ebcfa91fed930c1a1bf664dAndrew Trick /// hasOneDef - Return true if there is exactly one instruction defining the 2070492a8c530df6c7b2ebcfa91fed930c1a1bf664dAndrew Trick /// specified register. 2080492a8c530df6c7b2ebcfa91fed930c1a1bf664dAndrew Trick bool hasOneDef(unsigned RegNo) const { 2090492a8c530df6c7b2ebcfa91fed930c1a1bf664dAndrew Trick def_iterator DI = def_begin(RegNo); 2100492a8c530df6c7b2ebcfa91fed930c1a1bf664dAndrew Trick if (DI == def_end()) 2110492a8c530df6c7b2ebcfa91fed930c1a1bf664dAndrew Trick return false; 2120492a8c530df6c7b2ebcfa91fed930c1a1bf664dAndrew Trick return ++DI == def_end(); 2130492a8c530df6c7b2ebcfa91fed930c1a1bf664dAndrew Trick } 2140492a8c530df6c7b2ebcfa91fed930c1a1bf664dAndrew Trick 215c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner /// use_iterator/use_begin/use_end - Walk all uses of the specified register. 216a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen typedef defusechain_iterator<true,false,false> use_iterator; 217c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner use_iterator use_begin(unsigned RegNo) const { 218c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner return use_iterator(getRegUseDefListHead(RegNo)); 219c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner } 220c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner static use_iterator use_end() { return use_iterator(0); } 22190019479f9a3868d8be90564695097a61a725438Andrew Trick 222ce049437d6986cfb4c0dba6bf99cadd8c301351aEvan Cheng /// use_empty - Return true if there are no instructions using the specified 223ce049437d6986cfb4c0dba6bf99cadd8c301351aEvan Cheng /// register. 224ce049437d6986cfb4c0dba6bf99cadd8c301351aEvan Cheng bool use_empty(unsigned RegNo) const { return use_begin(RegNo) == use_end(); } 225ce049437d6986cfb4c0dba6bf99cadd8c301351aEvan Cheng 2261423c70b8f1b1a757c640fac9a17cb015012e8e9Evan Cheng /// hasOneUse - Return true if there is exactly one instruction using the 2271423c70b8f1b1a757c640fac9a17cb015012e8e9Evan Cheng /// specified register. 228269120cd9b45b24665433ea28eb7d092c138ca76Andrew Trick bool hasOneUse(unsigned RegNo) const { 229269120cd9b45b24665433ea28eb7d092c138ca76Andrew Trick use_iterator UI = use_begin(RegNo); 230269120cd9b45b24665433ea28eb7d092c138ca76Andrew Trick if (UI == use_end()) 231269120cd9b45b24665433ea28eb7d092c138ca76Andrew Trick return false; 232269120cd9b45b24665433ea28eb7d092c138ca76Andrew Trick return ++UI == use_end(); 233269120cd9b45b24665433ea28eb7d092c138ca76Andrew Trick } 2341423c70b8f1b1a757c640fac9a17cb015012e8e9Evan Cheng 235a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen /// use_nodbg_iterator/use_nodbg_begin/use_nodbg_end - Walk all uses of the 236a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen /// specified register, skipping those marked as Debug. 237a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen typedef defusechain_iterator<true,false,true> use_nodbg_iterator; 238a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen use_nodbg_iterator use_nodbg_begin(unsigned RegNo) const { 239a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen return use_nodbg_iterator(getRegUseDefListHead(RegNo)); 240a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen } 241a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen static use_nodbg_iterator use_nodbg_end() { return use_nodbg_iterator(0); } 24290019479f9a3868d8be90564695097a61a725438Andrew Trick 243a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen /// use_nodbg_empty - Return true if there are no non-Debug instructions 244a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen /// using the specified register. 245a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen bool use_nodbg_empty(unsigned RegNo) const { 246a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen return use_nodbg_begin(RegNo) == use_nodbg_end(); 247a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen } 248a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen 2491423c70b8f1b1a757c640fac9a17cb015012e8e9Evan Cheng /// hasOneNonDBGUse - Return true if there is exactly one non-Debug 2501423c70b8f1b1a757c640fac9a17cb015012e8e9Evan Cheng /// instruction using the specified register. 2511423c70b8f1b1a757c640fac9a17cb015012e8e9Evan Cheng bool hasOneNonDBGUse(unsigned RegNo) const; 2521423c70b8f1b1a757c640fac9a17cb015012e8e9Evan Cheng 253e138b3dd1ff02d826233482831318708a166ed93Chris Lattner /// replaceRegWith - Replace all instances of FromReg with ToReg in the 254e138b3dd1ff02d826233482831318708a166ed93Chris Lattner /// machine function. This is like llvm-level X->replaceAllUsesWith(Y), 255e138b3dd1ff02d826233482831318708a166ed93Chris Lattner /// except that it also changes any definitions of the register as well. 2564007529d4b014f43a1c7089f9b285a67c1c9b853Jakob Stoklund Olesen /// 2574007529d4b014f43a1c7089f9b285a67c1c9b853Jakob Stoklund Olesen /// Note that it is usually necessary to first constrain ToReg's register 2584007529d4b014f43a1c7089f9b285a67c1c9b853Jakob Stoklund Olesen /// class to match the FromReg constraints using: 2594007529d4b014f43a1c7089f9b285a67c1c9b853Jakob Stoklund Olesen /// 2604007529d4b014f43a1c7089f9b285a67c1c9b853Jakob Stoklund Olesen /// constrainRegClass(ToReg, getRegClass(FromReg)) 2614007529d4b014f43a1c7089f9b285a67c1c9b853Jakob Stoklund Olesen /// 2624007529d4b014f43a1c7089f9b285a67c1c9b853Jakob Stoklund Olesen /// That function will return NULL if the virtual registers have incompatible 2634007529d4b014f43a1c7089f9b285a67c1c9b853Jakob Stoklund Olesen /// constraints. 264e138b3dd1ff02d826233482831318708a166ed93Chris Lattner void replaceRegWith(unsigned FromReg, unsigned ToReg); 26590019479f9a3868d8be90564695097a61a725438Andrew Trick 2661eb5cf9c7d0b0b04402eddc007b0de414488baf4Evan Cheng /// getVRegDef - Return the machine instr that defines the specified virtual 2671eb5cf9c7d0b0b04402eddc007b0de414488baf4Evan Cheng /// register or null if none is found. This assumes that the code is in SSA 2681eb5cf9c7d0b0b04402eddc007b0de414488baf4Evan Cheng /// form, so there should only be one definition. 2691eb5cf9c7d0b0b04402eddc007b0de414488baf4Evan Cheng MachineInstr *getVRegDef(unsigned Reg) const; 27049b4589978ca181537c8ae694ac4c8d58d27a09aDan Gohman 27154d69668b22b8c37aa6e45f14445f3988cc430d4Manman Ren /// getUniqueVRegDef - Return the unique machine instr that defines the 27254d69668b22b8c37aa6e45f14445f3988cc430d4Manman Ren /// specified virtual register or null if none is found. If there are 27354d69668b22b8c37aa6e45f14445f3988cc430d4Manman Ren /// multiple definitions or no definition, return null. 27454d69668b22b8c37aa6e45f14445f3988cc430d4Manman Ren MachineInstr *getUniqueVRegDef(unsigned Reg) const; 27554d69668b22b8c37aa6e45f14445f3988cc430d4Manman Ren 27649b4589978ca181537c8ae694ac4c8d58d27a09aDan Gohman /// clearKillFlags - Iterate over all the uses of the given register and 27749b4589978ca181537c8ae694ac4c8d58d27a09aDan Gohman /// clear the kill flag from the MachineOperand. This function is used by 27849b4589978ca181537c8ae694ac4c8d58d27a09aDan Gohman /// optimization passes which extend register lifetimes and need only 27949b4589978ca181537c8ae694ac4c8d58d27a09aDan Gohman /// preserve conservative kill flag information. 28049b4589978ca181537c8ae694ac4c8d58d27a09aDan Gohman void clearKillFlags(unsigned Reg) const; 28190019479f9a3868d8be90564695097a61a725438Andrew Trick 2821eb5cf9c7d0b0b04402eddc007b0de414488baf4Evan Cheng#ifndef NDEBUG 2831eb5cf9c7d0b0b04402eddc007b0de414488baf4Evan Cheng void dumpUses(unsigned RegNo) const; 2841eb5cf9c7d0b0b04402eddc007b0de414488baf4Evan Cheng#endif 285c035c940a656f34a58ebe22fcc5f9b2a7d8e97fbJakob Stoklund Olesen 286c035c940a656f34a58ebe22fcc5f9b2a7d8e97fbJakob Stoklund Olesen /// isConstantPhysReg - Returns true if PhysReg is unallocatable and constant 287c035c940a656f34a58ebe22fcc5f9b2a7d8e97fbJakob Stoklund Olesen /// throughout the function. It is safe to move instructions that read such 288c035c940a656f34a58ebe22fcc5f9b2a7d8e97fbJakob Stoklund Olesen /// a physreg. 289c035c940a656f34a58ebe22fcc5f9b2a7d8e97fbJakob Stoklund Olesen bool isConstantPhysReg(unsigned PhysReg, const MachineFunction &MF) const; 290c035c940a656f34a58ebe22fcc5f9b2a7d8e97fbJakob Stoklund Olesen 29184bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner //===--------------------------------------------------------------------===// 29284bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner // Virtual Register Info 29384bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner //===--------------------------------------------------------------------===// 29490019479f9a3868d8be90564695097a61a725438Andrew Trick 29584bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// getRegClass - Return the register class of the specified virtual register. 29611a26f3697ea6520022ea6d3fa6a07b3c1b988cdEvan Cheng /// 2971eb5cf9c7d0b0b04402eddc007b0de414488baf4Evan Cheng const TargetRegisterClass *getRegClass(unsigned Reg) const { 29862ed6b9ade63bf01717ce5274fa11e93e873d245Chris Lattner return VRegInfo[Reg].first; 29984bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner } 300bdf34bc12bfc39de02c19fa250e83edb5924a6cfEvan Cheng 301bdf34bc12bfc39de02c19fa250e83edb5924a6cfEvan Cheng /// setRegClass - Set the register class of the specified virtual register. 30211a26f3697ea6520022ea6d3fa6a07b3c1b988cdEvan Cheng /// 30333f1c68cba4e905fdd2bf7d2848c52052d46fbffDan Gohman void setRegClass(unsigned Reg, const TargetRegisterClass *RC); 30411a26f3697ea6520022ea6d3fa6a07b3c1b988cdEvan Cheng 305bf4699c56100a0184bbe4fb53937c7204ca1ceb0Jakob Stoklund Olesen /// constrainRegClass - Constrain the register class of the specified virtual 30691fb536a345dc268e5b73dbddb9bee4cba87b28fJakob Stoklund Olesen /// register to be a common subclass of RC and the current register class, 30791fb536a345dc268e5b73dbddb9bee4cba87b28fJakob Stoklund Olesen /// but only if the new class has at least MinNumRegs registers. Return the 30891fb536a345dc268e5b73dbddb9bee4cba87b28fJakob Stoklund Olesen /// new register class, or NULL if no such class exists. 309bf4699c56100a0184bbe4fb53937c7204ca1ceb0Jakob Stoklund Olesen /// This should only be used when the constraint is known to be trivial, like 310bf4699c56100a0184bbe4fb53937c7204ca1ceb0Jakob Stoklund Olesen /// GR32 -> GR32_NOSP. Beware of increasing register pressure. 3116d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen /// 312bf4699c56100a0184bbe4fb53937c7204ca1ceb0Jakob Stoklund Olesen const TargetRegisterClass *constrainRegClass(unsigned Reg, 31391fb536a345dc268e5b73dbddb9bee4cba87b28fJakob Stoklund Olesen const TargetRegisterClass *RC, 31491fb536a345dc268e5b73dbddb9bee4cba87b28fJakob Stoklund Olesen unsigned MinNumRegs = 0); 315bf4699c56100a0184bbe4fb53937c7204ca1ceb0Jakob Stoklund Olesen 3166d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen /// recomputeRegClass - Try to find a legal super-class of Reg's register 3176d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen /// class that still satisfies the constraints from the instructions using 3186d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen /// Reg. Returns true if Reg was upgraded. 3196d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen /// 3206d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen /// This method can be used after constraints have been removed from a 3216d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen /// virtual register, for example after removing instructions or splitting 3226d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen /// the live range. 3236d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen /// 3246d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen bool recomputeRegClass(unsigned Reg, const TargetMachine&); 3256d1fd0b979cb88809ebb77a24f4da69e1d67606bJakob Stoklund Olesen 32684bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// createVirtualRegister - Create and return a new virtual register in the 32784bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// function with the specified register class. 32884bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// 3292e3e5bf42742a7421b513829101501f2de6d2b02Dan Gohman unsigned createVirtualRegister(const TargetRegisterClass *RegClass); 33084bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner 331b421c566f512ed0ec87851866d335e9086c3f8beJakob Stoklund Olesen /// getNumVirtRegs - Return the number of virtual registers created. 332b421c566f512ed0ec87851866d335e9086c3f8beJakob Stoklund Olesen /// 333b421c566f512ed0ec87851866d335e9086c3f8beJakob Stoklund Olesen unsigned getNumVirtRegs() const { return VRegInfo.size(); } 334b421c566f512ed0ec87851866d335e9086c3f8beJakob Stoklund Olesen 33519273aec441411b4d571fdb87c6daa0fbe7a33a0Andrew Trick /// clearVirtRegs - Remove all virtual registers (after physreg assignment). 33619273aec441411b4d571fdb87c6daa0fbe7a33a0Andrew Trick void clearVirtRegs(); 33719273aec441411b4d571fdb87c6daa0fbe7a33a0Andrew Trick 33890f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng /// setRegAllocationHint - Specify a register allocation hint for the 33990f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng /// specified virtual register. 340358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng void setRegAllocationHint(unsigned Reg, unsigned Type, unsigned PrefReg) { 34190f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng RegAllocHints[Reg].first = Type; 34290f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng RegAllocHints[Reg].second = PrefReg; 34390f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng } 34490f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng 34590f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng /// getRegAllocationHint - Return the register allocation hint for the 34690f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng /// specified virtual register. 347358dec51804ee52e47ea3a47c9248086e458ad7cEvan Cheng std::pair<unsigned, unsigned> 34890f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng getRegAllocationHint(unsigned Reg) const { 34990f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng return RegAllocHints[Reg]; 35090f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng } 35190f95f88c6ce09c6744777dc9d140c3c77203b92Evan Cheng 35251458ed09e6db0e424cd528e10b879f59915abe4Jakob Stoklund Olesen /// getSimpleHint - Return the preferred register allocation hint, or 0 if a 35351458ed09e6db0e424cd528e10b879f59915abe4Jakob Stoklund Olesen /// standard simple hint (Type == 0) is not set. 35451458ed09e6db0e424cd528e10b879f59915abe4Jakob Stoklund Olesen unsigned getSimpleHint(unsigned Reg) const { 35551458ed09e6db0e424cd528e10b879f59915abe4Jakob Stoklund Olesen std::pair<unsigned, unsigned> Hint = getRegAllocationHint(Reg); 35651458ed09e6db0e424cd528e10b879f59915abe4Jakob Stoklund Olesen return Hint.first ? 0 : Hint.second; 35751458ed09e6db0e424cd528e10b879f59915abe4Jakob Stoklund Olesen } 35851458ed09e6db0e424cd528e10b879f59915abe4Jakob Stoklund Olesen 35951458ed09e6db0e424cd528e10b879f59915abe4Jakob Stoklund Olesen 36084bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner //===--------------------------------------------------------------------===// 36184bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner // Physical Register Use Info 36284bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner //===--------------------------------------------------------------------===// 36390019479f9a3868d8be90564695097a61a725438Andrew Trick 36484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// isPhysRegUsed - Return true if the specified register is used in this 3659aa6e0a134358c681cc5918ec65b1ec9726b778eJakob Stoklund Olesen /// function. Also check for clobbered aliases and registers clobbered by 3669aa6e0a134358c681cc5918ec65b1ec9726b778eJakob Stoklund Olesen /// function calls with register mask operands. 3679aa6e0a134358c681cc5918ec65b1ec9726b778eJakob Stoklund Olesen /// 3689aa6e0a134358c681cc5918ec65b1ec9726b778eJakob Stoklund Olesen /// This only works after register allocation. It is primarily used by 3699aa6e0a134358c681cc5918ec65b1ec9726b778eJakob Stoklund Olesen /// PrologEpilogInserter to determine which callee-saved registers need 3709aa6e0a134358c681cc5918ec65b1ec9726b778eJakob Stoklund Olesen /// spilling. 371d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen bool isPhysRegUsed(unsigned Reg) const { 372d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen if (UsedPhysRegMask.test(Reg)) 373d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen return true; 3744b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen for (MCRegUnitIterator Units(Reg, TRI); Units.isValid(); ++Units) 3754b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen if (UsedRegUnits.test(*Units)) 376a2a98fd0ddd2ae277be7cdd62aae92f6c5155e07Jakob Stoklund Olesen return true; 377a2a98fd0ddd2ae277be7cdd62aae92f6c5155e07Jakob Stoklund Olesen return false; 378a2a98fd0ddd2ae277be7cdd62aae92f6c5155e07Jakob Stoklund Olesen } 379a2a98fd0ddd2ae277be7cdd62aae92f6c5155e07Jakob Stoklund Olesen 38084bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// setPhysRegUsed - Mark the specified register used in this function. 38184bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// This should only be called during and after register allocation. 3824b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen void setPhysRegUsed(unsigned Reg) { 3834b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen for (MCRegUnitIterator Units(Reg, TRI); Units.isValid(); ++Units) 3844b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen UsedRegUnits.set(*Units); 3854b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen } 38682b07dc4995d48065bd95affff4d8513a5cad4f2Jakob Stoklund Olesen 387d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen /// addPhysRegsUsedFromRegMask - Mark any registers not in RegMask as used. 388d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen /// This corresponds to the bit mask attached to register mask operands. 389d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen void addPhysRegsUsedFromRegMask(const uint32_t *RegMask) { 390d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen UsedPhysRegMask.setBitsNotInMask(RegMask); 391d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen } 392d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen 39384bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// setPhysRegUnused - Mark the specified register unused in this function. 39484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// This should only be called during and after register allocation. 395d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen void setPhysRegUnused(unsigned Reg) { 396d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen UsedPhysRegMask.reset(Reg); 3974b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen for (MCRegUnitIterator Units(Reg, TRI); Units.isValid(); ++Units) 3984b1aa961fdbb75035a963f8c6a01c8c5f1dc3f16Jakob Stoklund Olesen UsedRegUnits.reset(*Units); 399d9f0ff56a1878347fe5a0f162ef8c2ef2b63aeb5Jakob Stoklund Olesen } 40084bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner 401d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen 402d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen //===--------------------------------------------------------------------===// 403d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen // Reserved Register Info 404d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen //===--------------------------------------------------------------------===// 405d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen // 406d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen // The set of reserved registers must be invariant during register 407d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen // allocation. For example, the target cannot suddenly decide it needs a 408d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen // frame pointer when the register allocator has already used the frame 409d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen // pointer register for something else. 410d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen // 411d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen // These methods can be used by target hooks like hasFP() to avoid changing 412d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen // the reserved register set during register allocation. 413d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen 414d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// freezeReservedRegs - Called by the register allocator to freeze the set 415d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// of reserved registers before allocation begins. 416d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen void freezeReservedRegs(const MachineFunction&); 417d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen 418d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// reservedRegsFrozen - Returns true after freezeReservedRegs() was called 419d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// to ensure the set of reserved registers stays constant. 420d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen bool reservedRegsFrozen() const { 421d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen return !ReservedRegs.empty(); 422d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen } 423d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen 424d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// canReserveReg - Returns true if PhysReg can be used as a reserved 425d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// register. Any register can be reserved before freezeReservedRegs() is 426d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen /// called. 427d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen bool canReserveReg(unsigned PhysReg) const { 428d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen return !reservedRegsFrozen() || ReservedRegs.test(PhysReg); 429d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen } 430d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen 431e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// getReservedRegs - Returns a reference to the frozen set of reserved 432e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// registers. This method should always be preferred to calling 433e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// TRI::getReservedRegs() when possible. 434e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen const BitVector &getReservedRegs() const { 435e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen assert(reservedRegsFrozen() && 436e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen "Reserved registers haven't been frozen yet. " 437e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen "Use TRI::getReservedRegs()."); 438e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen return ReservedRegs; 439e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen } 440e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen 441e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// isReserved - Returns true when PhysReg is a reserved register. 442e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// 443e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// Reserved registers may belong to an allocatable register class, but the 444e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// target has explicitly requested that they are not used. 445e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// 446e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen bool isReserved(unsigned PhysReg) const { 447e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen return getReservedRegs().test(PhysReg); 448e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen } 449e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen 450e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// isAllocatable - Returns true when PhysReg belongs to an allocatable 451e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// register class and it hasn't been reserved. 452e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// 453e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// Allocatable registers may show up in the allocation order of some virtual 454e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// register, so a register allocator needs to track its liveness and 455e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen /// availability. 456e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen bool isAllocatable(unsigned PhysReg) const { 457e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen return TRI->isInAllocatableClass(PhysReg) && !isReserved(PhysReg); 458e4f273908bd37df5f0f6b2c575dcb2af99f6b85bJakob Stoklund Olesen } 459d9e5c764bfea339fc5082bf17e558db959fd6d28Jakob Stoklund Olesen 46084bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner //===--------------------------------------------------------------------===// 46184bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner // LiveIn/LiveOut Management 46284bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner //===--------------------------------------------------------------------===// 46390019479f9a3868d8be90564695097a61a725438Andrew Trick 46484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// addLiveIn/Out - Add the specified register as a live in/out. Note that it 46584bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner /// is an error to add the same register to the same set more than once. 46684bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner void addLiveIn(unsigned Reg, unsigned vreg = 0) { 46784bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner LiveIns.push_back(std::make_pair(Reg, vreg)); 46884bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner } 46990019479f9a3868d8be90564695097a61a725438Andrew Trick 47084bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner // Iteration support for live in/out sets. These sets are kept in sorted 47184bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner // order by their register number. 47284bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner typedef std::vector<std::pair<unsigned,unsigned> >::const_iterator 47384bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner livein_iterator; 47484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner typedef std::vector<unsigned>::const_iterator liveout_iterator; 47584bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner livein_iterator livein_begin() const { return LiveIns.begin(); } 47684bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner livein_iterator livein_end() const { return LiveIns.end(); } 47784bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner bool livein_empty() const { return LiveIns.empty(); } 4786d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman 47913e73f483ef2ba630962dad3125393292533b756Dan Gohman bool isLiveIn(unsigned Reg) const; 4806d69ba8a6901c69d78488cbc41f8dbf080618fdeDan Gohman 4812ad0fcf794924f618a7240741cc14a39be99d0f2Evan Cheng /// getLiveInPhysReg - If VReg is a live-in virtual register, return the 4822ad0fcf794924f618a7240741cc14a39be99d0f2Evan Cheng /// corresponding live-in physical register. 4832ad0fcf794924f618a7240741cc14a39be99d0f2Evan Cheng unsigned getLiveInPhysReg(unsigned VReg) const; 4842ad0fcf794924f618a7240741cc14a39be99d0f2Evan Cheng 4853946043a80a043b3cf43b34bf068feaadc46485bEvan Cheng /// getLiveInVirtReg - If PReg is a live-in physical register, return the 4863946043a80a043b3cf43b34bf068feaadc46485bEvan Cheng /// corresponding live-in physical register. 4873946043a80a043b3cf43b34bf068feaadc46485bEvan Cheng unsigned getLiveInVirtReg(unsigned PReg) const; 4883946043a80a043b3cf43b34bf068feaadc46485bEvan Cheng 48998708260f55cab997a5db77e930a2bd35f4172aaDan Gohman /// EmitLiveInCopies - Emit copies to initialize livein virtual registers 49098708260f55cab997a5db77e930a2bd35f4172aaDan Gohman /// into the given entry block. 49198708260f55cab997a5db77e930a2bd35f4172aaDan Gohman void EmitLiveInCopies(MachineBasicBlock *EntryMBB, 49298708260f55cab997a5db77e930a2bd35f4172aaDan Gohman const TargetRegisterInfo &TRI, 49398708260f55cab997a5db77e930a2bd35f4172aaDan Gohman const TargetInstrInfo &TII); 49498708260f55cab997a5db77e930a2bd35f4172aaDan Gohman 495c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner /// defusechain_iterator - This class provides iterator support for machine 496c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner /// operands in the function that use or define a specific register. If 497c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner /// ReturnUses is true it returns uses of registers, if ReturnDefs is true it 498c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner /// returns defs. If neither are true then you are silly and it always 499a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen /// returns end(). If SkipDebug is true it skips uses marked Debug 500a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen /// when incrementing. 501a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen template<bool ReturnUses, bool ReturnDefs, bool SkipDebug> 502c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner class defusechain_iterator 503f0891be8bdbeeadb39da5575273b6645755fa383Gabor Greif : public std::iterator<std::forward_iterator_tag, MachineInstr, ptrdiff_t> { 5046c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner MachineOperand *Op; 5051327f69d98a2cb527b275ffc93080cf31ddf6dc5Dan Gohman explicit defusechain_iterator(MachineOperand *op) : Op(op) { 506c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner // If the first node isn't one we're interested in, advance to one that 507c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner // we are interested in. 508c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner if (op) { 509ae9f3a3b7c915f725aef5a7250e88eaeddda03c6Anton Korobeynikov if ((!ReturnUses && op->isUse()) || 510a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen (!ReturnDefs && op->isDef()) || 511a65aa0f0bba1ef2322d63d05c074a92168684c63Dale Johannesen (SkipDebug && op->isDebug())) 512c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner ++*this; 513c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner } 514c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner } 5156c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner friend class MachineRegisterInfo; 5166c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner public: 5177362ce08cb2c1f0b544b18dbc21630fb4baebcfcGabor Greif typedef std::iterator<std::forward_iterator_tag, 5187362ce08cb2c1f0b544b18dbc21630fb4baebcfcGabor Greif MachineInstr, ptrdiff_t>::reference reference; 5197362ce08cb2c1f0b544b18dbc21630fb4baebcfcGabor Greif typedef std::iterator<std::forward_iterator_tag, 5207362ce08cb2c1f0b544b18dbc21630fb4baebcfcGabor Greif MachineInstr, ptrdiff_t>::pointer pointer; 52190019479f9a3868d8be90564695097a61a725438Andrew Trick 522c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner defusechain_iterator(const defusechain_iterator &I) : Op(I.Op) {} 523c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner defusechain_iterator() : Op(0) {} 52490019479f9a3868d8be90564695097a61a725438Andrew Trick 525c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner bool operator==(const defusechain_iterator &x) const { 5266c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner return Op == x.Op; 5276c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner } 528c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner bool operator!=(const defusechain_iterator &x) const { 5296c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner return !operator==(x); 5306c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner } 53190019479f9a3868d8be90564695097a61a725438Andrew Trick 5326c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner /// atEnd - return true if this iterator is equal to reg_end() on the value. 5336c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner bool atEnd() const { return Op == 0; } 53490019479f9a3868d8be90564695097a61a725438Andrew Trick 5356c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner // Iterator traversal: forward iteration only 536c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner defusechain_iterator &operator++() { // Preincrement 5376c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner assert(Op && "Cannot increment end iterator!"); 538fdd6484b41ef0fa7eb8c995fb34b728b193c6258Jakob Stoklund Olesen Op = getNextOperandForReg(Op); 53990019479f9a3868d8be90564695097a61a725438Andrew Trick 540c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen // All defs come before the uses, so stop def_iterator early. 541c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen if (!ReturnUses) { 542c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen if (Op) { 543c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen if (Op->isUse()) 544c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen Op = 0; 545c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen else 546c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen assert(!Op->isDebug() && "Can't have debug defs"); 547c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen } 548c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen } else { 549c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen // If this is an operand we don't care about, skip it. 550c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen while (Op && ((!ReturnDefs && Op->isDef()) || 551c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen (SkipDebug && Op->isDebug()))) 552c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen Op = getNextOperandForReg(Op); 553c7908037d87c8f6866b872e9f6b5a7fffae5b63eJakob Stoklund Olesen } 55490019479f9a3868d8be90564695097a61a725438Andrew Trick 5556c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner return *this; 5566c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner } 557c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner defusechain_iterator operator++(int) { // Postincrement 558c637d6f4525e417260cf2ce08643dc62283e523fChris Lattner defusechain_iterator tmp = *this; ++*this; return tmp; 5596c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner } 560914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen 561914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen /// skipInstruction - move forward until reaching a different instruction. 562914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen /// Return the skipped instruction that is no longer pointed to, or NULL if 563914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen /// already pointing to end(). 564914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen MachineInstr *skipInstruction() { 565914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen if (!Op) return 0; 566914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen MachineInstr *MI = Op->getParent(); 567914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen do ++*this; 568914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen while (Op && Op->getParent() == MI); 569914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen return MI; 570914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen } 571914f2ff9e6969214d84a75745ec2851f045000f7Jakob Stoklund Olesen 57266c994c2dbd1a76418fdd0acb138aa029538ffe5Jakob Stoklund Olesen MachineInstr *skipBundle() { 57366c994c2dbd1a76418fdd0acb138aa029538ffe5Jakob Stoklund Olesen if (!Op) return 0; 57466c994c2dbd1a76418fdd0acb138aa029538ffe5Jakob Stoklund Olesen MachineInstr *MI = getBundleStart(Op->getParent()); 57566c994c2dbd1a76418fdd0acb138aa029538ffe5Jakob Stoklund Olesen do ++*this; 57666c994c2dbd1a76418fdd0acb138aa029538ffe5Jakob Stoklund Olesen while (Op && getBundleStart(Op->getParent()) == MI); 57766c994c2dbd1a76418fdd0acb138aa029538ffe5Jakob Stoklund Olesen return MI; 57866c994c2dbd1a76418fdd0acb138aa029538ffe5Jakob Stoklund Olesen } 57966c994c2dbd1a76418fdd0acb138aa029538ffe5Jakob Stoklund Olesen 580e138b3dd1ff02d826233482831318708a166ed93Chris Lattner MachineOperand &getOperand() const { 5816c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner assert(Op && "Cannot dereference end iterator!"); 5826c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner return *Op; 5836c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner } 58490019479f9a3868d8be90564695097a61a725438Andrew Trick 585e138b3dd1ff02d826233482831318708a166ed93Chris Lattner /// getOperandNo - Return the operand # of this MachineOperand in its 586e138b3dd1ff02d826233482831318708a166ed93Chris Lattner /// MachineInstr. 587e138b3dd1ff02d826233482831318708a166ed93Chris Lattner unsigned getOperandNo() const { 588e138b3dd1ff02d826233482831318708a166ed93Chris Lattner assert(Op && "Cannot dereference end iterator!"); 589e138b3dd1ff02d826233482831318708a166ed93Chris Lattner return Op - &Op->getParent()->getOperand(0); 590e138b3dd1ff02d826233482831318708a166ed93Chris Lattner } 59190019479f9a3868d8be90564695097a61a725438Andrew Trick 592e138b3dd1ff02d826233482831318708a166ed93Chris Lattner // Retrieve a reference to the current operand. 593e138b3dd1ff02d826233482831318708a166ed93Chris Lattner MachineInstr &operator*() const { 594e138b3dd1ff02d826233482831318708a166ed93Chris Lattner assert(Op && "Cannot dereference end iterator!"); 595e138b3dd1ff02d826233482831318708a166ed93Chris Lattner return *Op->getParent(); 596e138b3dd1ff02d826233482831318708a166ed93Chris Lattner } 59790019479f9a3868d8be90564695097a61a725438Andrew Trick 598e138b3dd1ff02d826233482831318708a166ed93Chris Lattner MachineInstr *operator->() const { 599e138b3dd1ff02d826233482831318708a166ed93Chris Lattner assert(Op && "Cannot dereference end iterator!"); 600e138b3dd1ff02d826233482831318708a166ed93Chris Lattner return Op->getParent(); 601e138b3dd1ff02d826233482831318708a166ed93Chris Lattner } 6026c5757e4e85bb190097be13c1630bb107a1fbcfeChris Lattner }; 60390019479f9a3868d8be90564695097a61a725438Andrew Trick 60484bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner}; 60584bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner 60684bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner} // End llvm namespace 60784bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner 60884bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner#endif 609