VirtRegMap.h revision d36531249a9a9500e516148e7e72d4c0a7a4d0ee
134d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos//===-- llvm/CodeGen/VirtRegMap.h - Virtual Register Map -*- C++ -*--------===// 234d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// 334d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// The LLVM Compiler Infrastructure 434d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 734d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// 834d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos//===----------------------------------------------------------------------===// 934d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// 108c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// This file implements a virtual register map. This maps virtual registers to 118c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// physical registers and virtual registers to stack slots. It is created and 128c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// updated by a register allocator and then used by a machine code rewriter that 138c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner// adds spill code and rewrites virtual into physical register references. 1434d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos// 1534d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos//===----------------------------------------------------------------------===// 1634d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos 1734d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos#ifndef LLVM_CODEGEN_VIRTREGMAP_H 1834d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos#define LLVM_CODEGEN_VIRTREGMAP_H 1934d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos 206f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman#include "llvm/Target/TargetRegisterInfo.h" 2181a038218171860ee4c382849c647d3dc841fe8bEvan Cheng#include "llvm/ADT/DenseMap.h" 2294c002a190cd2e3a52b1510bc997e53d63af0b3bChris Lattner#include "llvm/ADT/IndexedMap.h" 23d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng#include "llvm/ADT/SmallPtrSet.h" 24e81561909d128c6e2d8033cb5465a49b2596b26aBill Wendling#include "llvm/Support/Streams.h" 255f37502bfbadfa65de087627bd67fd58bb03725cAlkis Evlogimenos#include <map> 2634d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos 2734d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenosnamespace llvm { 288c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner class MachineInstr; 297e23146ab9dd6c2d8849bacce841a2e4660305dcDavid Greene class MachineFunction; 302926869b4a083fc951484de03a9867eabf81e880Chris Lattner class TargetInstrInfo; 318c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 328c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner class VirtRegMap { 338c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner public: 342638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng enum { 352638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng NO_PHYS_REG = 0, 369193514e2e3e599e241220b72bc9add25a80a8fdEvan Cheng NO_STACK_SLOT = (1L << 30)-1, 379193514e2e3e599e241220b72bc9add25a80a8fdEvan Cheng MAX_STACK_SLOT = (1L << 18)-1 382638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng }; 392638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng 4035f2705e3de4600c3621b883eed9b22e4607ddf4Chris Lattner enum ModRef { isRef = 1, isMod = 2, isModRef = 3 }; 41bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner typedef std::multimap<MachineInstr*, 42bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner std::pair<unsigned, ModRef> > MI2VirtMapTy; 438c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 448c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner private: 452926869b4a083fc951484de03a9867eabf81e880Chris Lattner const TargetInstrInfo &TII; 462926869b4a083fc951484de03a9867eabf81e880Chris Lattner 477f690e625807b9320bf4ae437b8f35258acc99deChris Lattner MachineFunction &MF; 48c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// Virt2PhysMap - This is a virtual to physical register 49c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// mapping. Each virtual register is required to have an entry in 50c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// it; even spilled virtual registers (the register mapped to a 51c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// spilled register is the temporary used to load it from the 52c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// stack). 5394c002a190cd2e3a52b1510bc997e53d63af0b3bChris Lattner IndexedMap<unsigned, VirtReg2IndexFunctor> Virt2PhysMap; 5481a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 55c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// Virt2StackSlotMap - This is virtual register to stack slot 56c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// mapping. Each spilled virtual register has an entry in it 57c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// which corresponds to the stack slot this register is spilled 58c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// at. 5994c002a190cd2e3a52b1510bc997e53d63af0b3bChris Lattner IndexedMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap; 6081a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 6181a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// Virt2StackSlotMap - This is virtual register to rematerialization id 6281a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// mapping. Each spilled virtual register that should be remat'd has an 6381a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// entry in it which corresponds to the remat id. 64549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng IndexedMap<int, VirtReg2IndexFunctor> Virt2ReMatIdMap; 6581a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 6681a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// Virt2SplitMap - This is virtual register to splitted virtual register 6781a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// mapping. 6881a038218171860ee4c382849c647d3dc841fe8bEvan Cheng IndexedMap<unsigned, VirtReg2IndexFunctor> Virt2SplitMap; 6981a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 70adf85906906ebf85c57c333e8209f37ef11a6c99Evan Cheng /// Virt2SplitKillMap - This is splitted virtual register to its last use 71d120ffd26f2715c600b028d4eac9a3c41a9f4653Evan Cheng /// (kill) index mapping. 72d120ffd26f2715c600b028d4eac9a3c41a9f4653Evan Cheng IndexedMap<unsigned> Virt2SplitKillMap; 73adf85906906ebf85c57c333e8209f37ef11a6c99Evan Cheng 7481a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// ReMatMap - This is virtual register to re-materialized instruction 7581a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// mapping. Each virtual register whose definition is going to be 7681a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// re-materialized has an entry in it. 7781a038218171860ee4c382849c647d3dc841fe8bEvan Cheng IndexedMap<MachineInstr*, VirtReg2IndexFunctor> ReMatMap; 7881a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 79c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// MI2VirtMap - This is MachineInstr to virtual register 80c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// mapping. In the case of memory spill code being folded into 81c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// instructions, we need to know which virtual register was 82c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// read/written by this instruction. 837f690e625807b9320bf4ae437b8f35258acc99deChris Lattner MI2VirtMapTy MI2VirtMap; 84edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 8581a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// SpillPt2VirtMap - This records the virtual registers which should 8681a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// be spilled right after the MachineInstr due to live interval 8781a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// splitting. 88b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng std::map<MachineInstr*, std::vector<std::pair<unsigned,bool> > > 89b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng SpillPt2VirtMap; 902638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng 910cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng /// RestorePt2VirtMap - This records the virtual registers which should 920cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng /// be restored right before the MachineInstr due to live interval 930cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng /// splitting. 940cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng std::map<MachineInstr*, std::vector<unsigned> > RestorePt2VirtMap; 950cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng 962638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// ReMatId - Instead of assigning a stack slot to a to be rematerialized 979193514e2e3e599e241220b72bc9add25a80a8fdEvan Cheng /// virtual register, an unique id is being assigned. This keeps track of 982638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// the highest id used so far. Note, this starts at (1<<18) to avoid 992638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// conflicts with stack slot numbers. 1002638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng int ReMatId; 1012638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng 102d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng /// LowSpillSlot, HighSpillSlot - Lowest and highest spill slot indexes. 103d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng int LowSpillSlot, HighSpillSlot; 104d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng 105d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng /// SpillSlotToUsesMap - Records uses for each register spill slot. 106d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng SmallVector<SmallPtrSet<MachineInstr*, 4>, 8> SpillSlotToUsesMap; 107d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng 1088c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT 1098c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner void operator=(const VirtRegMap&); // DO NOT IMPLEMENT 1108c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 1118c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner public: 11261e729e2e9517ab2d8887bab86fb377900fa1081Dan Gohman explicit VirtRegMap(MachineFunction &mf); 1138c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 1148c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner void grow(); 1158c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 116c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// @brief returns true if the specified virtual register is 117c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// mapped to a physical register 1188c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner bool hasPhys(unsigned virtReg) const { 1198c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner return getPhys(virtReg) != NO_PHYS_REG; 1208c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1218c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 122c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// @brief returns the physical register mapped to the specified 123c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// virtual register 1248c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner unsigned getPhys(unsigned virtReg) const { 1256f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman assert(TargetRegisterInfo::isVirtualRegister(virtReg)); 1267f690e625807b9320bf4ae437b8f35258acc99deChris Lattner return Virt2PhysMap[virtReg]; 1278c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1288c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 129c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// @brief creates a mapping for the specified virtual register to 130c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// the specified physical register 1318c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner void assignVirt2Phys(unsigned virtReg, unsigned physReg) { 1326f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman assert(TargetRegisterInfo::isVirtualRegister(virtReg) && 1336f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman TargetRegisterInfo::isPhysicalRegister(physReg)); 1347f690e625807b9320bf4ae437b8f35258acc99deChris Lattner assert(Virt2PhysMap[virtReg] == NO_PHYS_REG && 1358c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner "attempt to assign physical register to already mapped " 1368c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner "virtual register"); 1377f690e625807b9320bf4ae437b8f35258acc99deChris Lattner Virt2PhysMap[virtReg] = physReg; 1388c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1398c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 140c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// @brief clears the specified virtual register's, physical 141c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// register mapping 1428c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner void clearVirt(unsigned virtReg) { 1436f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman assert(TargetRegisterInfo::isVirtualRegister(virtReg)); 1447f690e625807b9320bf4ae437b8f35258acc99deChris Lattner assert(Virt2PhysMap[virtReg] != NO_PHYS_REG && 1458c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner "attempt to clear a not assigned virtual register"); 1467f690e625807b9320bf4ae437b8f35258acc99deChris Lattner Virt2PhysMap[virtReg] = NO_PHYS_REG; 1478c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1488c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 149c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// @brief clears all virtual to physical register mappings 1508c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner void clearAllVirt() { 1517f690e625807b9320bf4ae437b8f35258acc99deChris Lattner Virt2PhysMap.clear(); 1528c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner grow(); 1538c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1548c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 15581a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// @brief records virtReg is a split live interval from SReg. 15681a038218171860ee4c382849c647d3dc841fe8bEvan Cheng void setIsSplitFromReg(unsigned virtReg, unsigned SReg) { 15781a038218171860ee4c382849c647d3dc841fe8bEvan Cheng Virt2SplitMap[virtReg] = SReg; 15881a038218171860ee4c382849c647d3dc841fe8bEvan Cheng } 15981a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 16081a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// @brief returns the live interval virtReg is split from. 16181a038218171860ee4c382849c647d3dc841fe8bEvan Cheng unsigned getPreSplitReg(unsigned virtReg) { 16281a038218171860ee4c382849c647d3dc841fe8bEvan Cheng return Virt2SplitMap[virtReg]; 16381a038218171860ee4c382849c647d3dc841fe8bEvan Cheng } 16481a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 165549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng /// @brief returns true is the specified virtual register is not 166549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng /// mapped to a stack slot or rematerialized. 167549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng bool isAssignedReg(unsigned virtReg) const { 16881a038218171860ee4c382849c647d3dc841fe8bEvan Cheng if (getStackSlot(virtReg) == NO_STACK_SLOT && 16981a038218171860ee4c382849c647d3dc841fe8bEvan Cheng getReMatId(virtReg) == NO_STACK_SLOT) 17081a038218171860ee4c382849c647d3dc841fe8bEvan Cheng return true; 17181a038218171860ee4c382849c647d3dc841fe8bEvan Cheng // Split register can be assigned a physical register as well as a 17281a038218171860ee4c382849c647d3dc841fe8bEvan Cheng // stack slot or remat id. 17381a038218171860ee4c382849c647d3dc841fe8bEvan Cheng return (Virt2SplitMap[virtReg] && Virt2PhysMap[virtReg] != NO_PHYS_REG); 1748c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1758c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 176c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// @brief returns the stack slot mapped to the specified virtual 177c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// register 1788c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner int getStackSlot(unsigned virtReg) const { 1796f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman assert(TargetRegisterInfo::isVirtualRegister(virtReg)); 1807f690e625807b9320bf4ae437b8f35258acc99deChris Lattner return Virt2StackSlotMap[virtReg]; 1818c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 1828c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 183549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng /// @brief returns the rematerialization id mapped to the specified virtual 184549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng /// register 185549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng int getReMatId(unsigned virtReg) const { 1866f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman assert(TargetRegisterInfo::isVirtualRegister(virtReg)); 187549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng return Virt2ReMatIdMap[virtReg]; 188549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng } 189549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng 190c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// @brief create a mapping for the specifed virtual register to 191c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// the next available stack slot 1928c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner int assignVirt2StackSlot(unsigned virtReg); 193c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// @brief create a mapping for the specified virtual register to 194c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// the specified stack slot 1958c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner void assignVirt2StackSlot(unsigned virtReg, int frameIndex); 1968c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 1972638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// @brief assign an unique re-materialization id to the specified 1982638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// virtual register. 1992638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng int assignVirtReMatId(unsigned virtReg); 200549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng /// @brief assign an unique re-materialization id to the specified 201549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng /// virtual register. 202549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng void assignVirtReMatId(unsigned virtReg, int id); 2032638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng 2042638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// @brief returns true if the specified virtual register is being 2052638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// re-materialized. 2062638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng bool isReMaterialized(unsigned virtReg) const { 207549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng return ReMatMap[virtReg] != NULL; 2082638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng } 2092638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng 2102638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// @brief returns the original machine instruction being re-issued 2112638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// to re-materialize the specified virtual register. 212549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng MachineInstr *getReMaterializedMI(unsigned virtReg) const { 2132638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng return ReMatMap[virtReg]; 2142638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng } 2152638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng 2162638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// @brief records the specified virtual register will be 2172638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng /// re-materialized and the original instruction which will be re-issed 218549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng /// for this purpose. If parameter all is true, then all uses of the 219549f27d3070195d6647b796841a5291b4549e8e0Evan Cheng /// registers are rematerialized and it's safe to delete the definition. 2202638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng void setVirtIsReMaterialized(unsigned virtReg, MachineInstr *def) { 2212638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng ReMatMap[virtReg] = def; 2222638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng } 2232638e1a6b9e3c0e22b398987e1db99bee81db4fbEvan Cheng 224adf85906906ebf85c57c333e8209f37ef11a6c99Evan Cheng /// @brief record the last use (kill) of a split virtual register. 225d120ffd26f2715c600b028d4eac9a3c41a9f4653Evan Cheng void addKillPoint(unsigned virtReg, unsigned index) { 226d120ffd26f2715c600b028d4eac9a3c41a9f4653Evan Cheng Virt2SplitKillMap[virtReg] = index; 227adf85906906ebf85c57c333e8209f37ef11a6c99Evan Cheng } 228adf85906906ebf85c57c333e8209f37ef11a6c99Evan Cheng 229d120ffd26f2715c600b028d4eac9a3c41a9f4653Evan Cheng unsigned getKillPoint(unsigned virtReg) const { 230d120ffd26f2715c600b028d4eac9a3c41a9f4653Evan Cheng return Virt2SplitKillMap[virtReg]; 231d120ffd26f2715c600b028d4eac9a3c41a9f4653Evan Cheng } 232d120ffd26f2715c600b028d4eac9a3c41a9f4653Evan Cheng 233d120ffd26f2715c600b028d4eac9a3c41a9f4653Evan Cheng /// @brief remove the last use (kill) of a split virtual register. 234adf85906906ebf85c57c333e8209f37ef11a6c99Evan Cheng void removeKillPoint(unsigned virtReg) { 235d120ffd26f2715c600b028d4eac9a3c41a9f4653Evan Cheng Virt2SplitKillMap[virtReg] = 0; 236adf85906906ebf85c57c333e8209f37ef11a6c99Evan Cheng } 237adf85906906ebf85c57c333e8209f37ef11a6c99Evan Cheng 238cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng /// @brief returns true if the specified MachineInstr is a spill point. 239cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng bool isSpillPt(MachineInstr *Pt) const { 240cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng return SpillPt2VirtMap.find(Pt) != SpillPt2VirtMap.end(); 241cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng } 242cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng 24381a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// @brief returns the virtual registers that should be spilled due to 24481a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// splitting right after the specified MachineInstr. 245b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng std::vector<std::pair<unsigned,bool> > &getSpillPtSpills(MachineInstr *Pt) { 24681a038218171860ee4c382849c647d3dc841fe8bEvan Cheng return SpillPt2VirtMap[Pt]; 24781a038218171860ee4c382849c647d3dc841fe8bEvan Cheng } 24881a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 24981a038218171860ee4c382849c647d3dc841fe8bEvan Cheng /// @brief records the specified MachineInstr as a spill point for virtReg. 250b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng void addSpillPoint(unsigned virtReg, bool isKill, MachineInstr *Pt) { 251cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng if (SpillPt2VirtMap.find(Pt) != SpillPt2VirtMap.end()) 252b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng SpillPt2VirtMap[Pt].push_back(std::make_pair(virtReg, isKill)); 253cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng else { 254b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng std::vector<std::pair<unsigned,bool> > Virts; 255b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng Virts.push_back(std::make_pair(virtReg, isKill)); 256cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng SpillPt2VirtMap.insert(std::make_pair(Pt, Virts)); 257cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng } 25881a038218171860ee4c382849c647d3dc841fe8bEvan Cheng } 25981a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 26081a038218171860ee4c382849c647d3dc841fe8bEvan Cheng void transferSpillPts(MachineInstr *Old, MachineInstr *New) { 261b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng std::map<MachineInstr*,std::vector<std::pair<unsigned,bool> > >::iterator 262b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng I = SpillPt2VirtMap.find(Old); 263cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng if (I == SpillPt2VirtMap.end()) 264cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng return; 265cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng while (!I->second.empty()) { 266b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng unsigned virtReg = I->second.back().first; 267b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng bool isKill = I->second.back().second; 268cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng I->second.pop_back(); 269b50bb8cf197709b3f49044740044c06d8f314564Evan Cheng addSpillPoint(virtReg, isKill, New); 27081a038218171860ee4c382849c647d3dc841fe8bEvan Cheng } 271cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng SpillPt2VirtMap.erase(I); 27281a038218171860ee4c382849c647d3dc841fe8bEvan Cheng } 27381a038218171860ee4c382849c647d3dc841fe8bEvan Cheng 2740cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng /// @brief returns true if the specified MachineInstr is a restore point. 2750cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng bool isRestorePt(MachineInstr *Pt) const { 2760cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng return RestorePt2VirtMap.find(Pt) != RestorePt2VirtMap.end(); 2770cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng } 2780cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng 2790cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng /// @brief returns the virtual registers that should be restoreed due to 2800cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng /// splitting right after the specified MachineInstr. 2810cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng std::vector<unsigned> &getRestorePtRestores(MachineInstr *Pt) { 2820cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng return RestorePt2VirtMap[Pt]; 2830cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng } 2840cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng 2850cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng /// @brief records the specified MachineInstr as a restore point for virtReg. 2860cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng void addRestorePoint(unsigned virtReg, MachineInstr *Pt) { 2870cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng if (RestorePt2VirtMap.find(Pt) != RestorePt2VirtMap.end()) 2880cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng RestorePt2VirtMap[Pt].push_back(virtReg); 2890cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng else { 2900cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng std::vector<unsigned> Virts; 2910cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng Virts.push_back(virtReg); 2920cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng RestorePt2VirtMap.insert(std::make_pair(Pt, Virts)); 2930cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng } 2940cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng } 2950cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng 2960cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng void transferRestorePts(MachineInstr *Old, MachineInstr *New) { 2970cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng std::map<MachineInstr*,std::vector<unsigned> >::iterator I = 2980cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng RestorePt2VirtMap.find(Old); 2990cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng if (I == RestorePt2VirtMap.end()) 3000cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng return; 3010cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng while (!I->second.empty()) { 3020cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng unsigned virtReg = I->second.back(); 3030cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng I->second.pop_back(); 3040cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng addRestorePoint(virtReg, New); 3050cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng } 3060cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng RestorePt2VirtMap.erase(I); 3070cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng } 3080cbb1164b3227f25f5e5d3681800a8e50e6b9865Evan Cheng 309d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng /// @brief Return lowest spill slot index. 310d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng int getLowSpillSlot() const { 311d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng return LowSpillSlot; 312d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng } 313d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng 314d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng /// @brief Return highest spill slot index. 315d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng int getHighSpillSlot() const { 316d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng return HighSpillSlot; 317d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng } 318d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng 319d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng /// @brief Records a spill slot use. 320d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng void addSpillSlotUse(int FrameIndex, MachineInstr *MI); 321d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng 322d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng /// @brief Returns true if spill slot has been used. 323d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng bool isSpillSlotUsed(int FrameIndex) const { 324d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng assert(FrameIndex >= 0 && "Spill slot index should not be negative!"); 325d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng return !SpillSlotToUsesMap[FrameIndex-LowSpillSlot].empty(); 326d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng } 327d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng 328bec6a9ea1281a0b3b37aece91ab0df21e086af61Chris Lattner /// @brief Updates information about the specified virtual register's value 329aee4af68ae2016afc5b4ec0c430e539c5810a766Evan Cheng /// folded into newMI machine instruction. 330aee4af68ae2016afc5b4ec0c430e539c5810a766Evan Cheng void virtFolded(unsigned VirtReg, MachineInstr *OldMI, MachineInstr *NewMI, 331aee4af68ae2016afc5b4ec0c430e539c5810a766Evan Cheng ModRef MRInfo); 3328c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 3337f56625447b94178118f2fec732b10f9e4aa7fbfEvan Cheng /// @brief Updates information about the specified virtual register's value 3347f56625447b94178118f2fec732b10f9e4aa7fbfEvan Cheng /// folded into the specified machine instruction. 3357f56625447b94178118f2fec732b10f9e4aa7fbfEvan Cheng void virtFolded(unsigned VirtReg, MachineInstr *MI, ModRef MRInfo); 3367f56625447b94178118f2fec732b10f9e4aa7fbfEvan Cheng 337c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// @brief returns the virtual registers' values folded in memory 338c736b3a37aa8959f9011bf0773288ba35c3f08b3Alkis Evlogimenos /// operands of this instruction 3397f690e625807b9320bf4ae437b8f35258acc99deChris Lattner std::pair<MI2VirtMapTy::const_iterator, MI2VirtMapTy::const_iterator> 3408c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner getFoldedVirts(MachineInstr* MI) const { 3417f690e625807b9320bf4ae437b8f35258acc99deChris Lattner return MI2VirtMap.equal_range(MI); 3428c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 34335f2705e3de4600c3621b883eed9b22e4607ddf4Chris Lattner 344cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng /// RemoveMachineInstrFromMaps - MI is being erased, remove it from the 345cada245d06959831b90f8c29f92e77beda4b71cbEvan Cheng /// the folded instruction map and spill point map. 346d36531249a9a9500e516148e7e72d4c0a7a4d0eeEvan Cheng void RemoveMachineInstrFromMaps(MachineInstr *MI); 3478c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 3488c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner void print(std::ostream &OS) const; 3495c7e326585f3a543388ba871c3425f7664cd9143Bill Wendling void print(std::ostream *OS) const { if (OS) print(*OS); } 3508c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner void dump() const; 3518c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner }; 3528c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 3535c7e326585f3a543388ba871c3425f7664cd9143Bill Wendling inline std::ostream *operator<<(std::ostream *OS, const VirtRegMap &VRM) { 3545c7e326585f3a543388ba871c3425f7664cd9143Bill Wendling VRM.print(OS); 3555c7e326585f3a543388ba871c3425f7664cd9143Bill Wendling return OS; 3565c7e326585f3a543388ba871c3425f7664cd9143Bill Wendling } 3578c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner inline std::ostream &operator<<(std::ostream &OS, const VirtRegMap &VRM) { 3588c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner VRM.print(OS); 3598c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner return OS; 3608c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner } 3618c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 3628c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner /// Spiller interface: Implementations of this interface assign spilled 3638c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner /// virtual registers to stack slots, rewriting the code. 3648c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner struct Spiller { 3658c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner virtual ~Spiller(); 3668c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner virtual bool runOnMachineFunction(MachineFunction &MF, 36735f2705e3de4600c3621b883eed9b22e4607ddf4Chris Lattner VirtRegMap &VRM) = 0; 3688c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner }; 3698c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner 3708c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner /// createSpiller - Create an return a spiller object, as specified on the 3718c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner /// command line. 3728c4d88d3697835371ecf6823f4142af13603ad2dChris Lattner Spiller* createSpiller(); 3730d6c5b6489b9abb634a1506d183ba47f1bf4d1f0Alkis Evlogimenos 37434d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos} // End llvm namespace 37534d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos 37634d9bc9f168d17c52eb57e024580bd9499695f91Alkis Evlogimenos#endif 377