-//===------- X86ExpandPseudo.cpp - Expand pseudo instructions -------------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains a pass that expands pseudo instructions into target
-// instructions to allow proper scheduling, if-conversion, other late
-// optimizations, or simply the encoding of the instructions.
-//
-//===----------------------------------------------------------------------===//
-
-#include "X86.h"
-#include "X86FrameLowering.h"
-#include "X86InstrBuilder.h"
-#include "X86InstrInfo.h"
-#include "X86MachineFunctionInfo.h"
-#include "X86Subtarget.h"
-#include "llvm/CodeGen/Passes.h" // For IDs of passes that are preserved.
-#include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/IR/GlobalValue.h"
-using namespace llvm;
-
-#define DEBUG_TYPE "x86-pseudo"
-
-namespace {
-class X86ExpandPseudo : public MachineFunctionPass {
-public:
- static char ID;
- X86ExpandPseudo() : MachineFunctionPass(ID) {}
-
- void getAnalysisUsage(AnalysisUsage &AU) const override {
- AU.setPreservesCFG();
- AU.addPreservedID(MachineLoopInfoID);
- AU.addPreservedID(MachineDominatorsID);
- MachineFunctionPass::getAnalysisUsage(AU);
- }
-
- const X86Subtarget *STI;
- const X86InstrInfo *TII;
- const X86RegisterInfo *TRI;
- const X86FrameLowering *X86FL;
-
- bool runOnMachineFunction(MachineFunction &Fn) override;
-
- const char *getPassName() const override {
- return "X86 pseudo instruction expansion pass";
- }
-
-private:
- bool ExpandMI(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI);
- bool ExpandMBB(MachineBasicBlock &MBB);
-};
-char X86ExpandPseudo::ID = 0;
-} // End anonymous namespace.
-
-/// If \p MBBI is a pseudo instruction, this method expands
-/// it to the corresponding (sequence of) actual instruction(s).
-/// \returns true if \p MBBI has been expanded.
-bool X86ExpandPseudo::ExpandMI(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MBBI) {
- MachineInstr &MI = *MBBI;
- unsigned Opcode = MI.getOpcode();
- DebugLoc DL = MBBI->getDebugLoc();
- switch (Opcode) {
- default:
- return false;
- case X86::TCRETURNdi:
- case X86::TCRETURNri:
- case X86::TCRETURNmi:
- case X86::TCRETURNdi64:
- case X86::TCRETURNri64:
- case X86::TCRETURNmi64: {
- bool isMem = Opcode == X86::TCRETURNmi || Opcode == X86::TCRETURNmi64;
- MachineOperand &JumpTarget = MBBI->getOperand(0);
- MachineOperand &StackAdjust = MBBI->getOperand(isMem ? 5 : 1);
- assert(StackAdjust.isImm() && "Expecting immediate value.");
-
- // Adjust stack pointer.
- int StackAdj = StackAdjust.getImm();
-
- if (StackAdj) {
- // Check for possible merge with preceding ADD instruction.
- StackAdj += X86FL->mergeSPUpdates(MBB, MBBI, true);
- X86FL->emitSPUpdate(MBB, MBBI, StackAdj, /*InEpilogue=*/true);
- }
-
- // Jump to label or value in register.
- bool IsWin64 = STI->isTargetWin64();
- if (Opcode == X86::TCRETURNdi || Opcode == X86::TCRETURNdi64) {
- unsigned Op = (Opcode == X86::TCRETURNdi)
- ? X86::TAILJMPd
- : (IsWin64 ? X86::TAILJMPd64_REX : X86::TAILJMPd64);
- MachineInstrBuilder MIB = BuildMI(MBB, MBBI, DL, TII->get(Op));
- if (JumpTarget.isGlobal())
- MIB.addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
- JumpTarget.getTargetFlags());
- else {
- assert(JumpTarget.isSymbol());
- MIB.addExternalSymbol(JumpTarget.getSymbolName(),
- JumpTarget.getTargetFlags());
- }
- } else if (Opcode == X86::TCRETURNmi || Opcode == X86::TCRETURNmi64) {
- unsigned Op = (Opcode == X86::TCRETURNmi)
- ? X86::TAILJMPm
- : (IsWin64 ? X86::TAILJMPm64_REX : X86::TAILJMPm64);
- MachineInstrBuilder MIB = BuildMI(MBB, MBBI, DL, TII->get(Op));
- for (unsigned i = 0; i != 5; ++i)
- MIB.addOperand(MBBI->getOperand(i));
- } else if (Opcode == X86::TCRETURNri64) {
- BuildMI(MBB, MBBI, DL,
- TII->get(IsWin64 ? X86::TAILJMPr64_REX : X86::TAILJMPr64))
- .addReg(JumpTarget.getReg(), RegState::Kill);
- } else {
- BuildMI(MBB, MBBI, DL, TII->get(X86::TAILJMPr))
- .addReg(JumpTarget.getReg(), RegState::Kill);
- }
-
- MachineInstr *NewMI = std::prev(MBBI);
- NewMI->copyImplicitOps(*MBBI->getParent()->getParent(), MBBI);
-
- // Delete the pseudo instruction TCRETURN.
- MBB.erase(MBBI);
-
- return true;
- }
- case X86::EH_RETURN:
- case X86::EH_RETURN64: {
- MachineOperand &DestAddr = MBBI->getOperand(0);
- assert(DestAddr.isReg() && "Offset should be in register!");
- const bool Uses64BitFramePtr =
- STI->isTarget64BitLP64() || STI->isTargetNaCl64();
- unsigned StackPtr = TRI->getStackRegister();
- BuildMI(MBB, MBBI, DL,
- TII->get(Uses64BitFramePtr ? X86::MOV64rr : X86::MOV32rr), StackPtr)
- .addReg(DestAddr.getReg());
- // The EH_RETURN pseudo is really removed during the MC Lowering.
- return true;
- }
-
- case X86::EH_RESTORE: {
- // Restore ESP and EBP, and optionally ESI if required.
- X86FL->restoreWin32EHStackPointers(MBB, MBBI, DL, /*RestoreSP=*/true);
- MBBI->eraseFromParent();
- return true;
- }
- }
- llvm_unreachable("Previous switch has a fallthrough?");
-}
-
-/// Expand all pseudo instructions contained in \p MBB.
-/// \returns true if any expansion occurred for \p MBB.
-bool X86ExpandPseudo::ExpandMBB(MachineBasicBlock &MBB) {
- bool Modified = false;
-
- // MBBI may be invalidated by the expansion.
- MachineBasicBlock::iterator MBBI = MBB.begin(), E = MBB.end();
- while (MBBI != E) {
- MachineBasicBlock::iterator NMBBI = std::next(MBBI);
- Modified |= ExpandMI(MBB, MBBI);
- MBBI = NMBBI;
- }
-
- return Modified;
-}
-
-bool X86ExpandPseudo::runOnMachineFunction(MachineFunction &MF) {
- STI = &static_cast<const X86Subtarget &>(MF.getSubtarget());
- TII = STI->getInstrInfo();
- TRI = STI->getRegisterInfo();
- X86FL = STI->getFrameLowering();
-
- bool Modified = false;
- for (MachineBasicBlock &MBB : MF)
- Modified |= ExpandMBB(MBB);
- return Modified;
-}
-
-/// Returns an instance of the pseudo instruction expansion pass.
-FunctionPass *llvm::createX86ExpandPseudoPass() {
- return new X86ExpandPseudo();
-}
+//===------- X86ExpandPseudo.cpp - Expand pseudo instructions -------------===//\r
+//\r
+// The LLVM Compiler Infrastructure\r
+//\r
+// This file is distributed under the University of Illinois Open Source\r
+// License. See LICENSE.TXT for details.\r
+//\r
+//===----------------------------------------------------------------------===//\r
+//\r
+// This file contains a pass that expands pseudo instructions into target\r
+// instructions to allow proper scheduling, if-conversion, other late\r
+// optimizations, or simply the encoding of the instructions.\r
+//\r
+//===----------------------------------------------------------------------===//\r
+\r
+#include "X86.h"\r
+#include "X86FrameLowering.h"\r
+#include "X86InstrBuilder.h"\r
+#include "X86InstrInfo.h"\r
+#include "X86MachineFunctionInfo.h"\r
+#include "X86Subtarget.h"\r
+#include "llvm/Analysis/EHPersonalities.h"\r
+#include "llvm/CodeGen/MachineFunctionPass.h"\r
+#include "llvm/CodeGen/MachineInstrBuilder.h"\r
+#include "llvm/CodeGen/Passes.h" // For IDs of passes that are preserved.\r
+#include "llvm/IR/GlobalValue.h"\r
+using namespace llvm;\r
+\r
+#define DEBUG_TYPE "x86-pseudo"\r
+\r
+namespace {\r
+class X86ExpandPseudo : public MachineFunctionPass {\r
+public:\r
+ static char ID;\r
+ X86ExpandPseudo() : MachineFunctionPass(ID) {}\r
+\r
+ void getAnalysisUsage(AnalysisUsage &AU) const override {\r
+ AU.setPreservesCFG();\r
+ AU.addPreservedID(MachineLoopInfoID);\r
+ AU.addPreservedID(MachineDominatorsID);\r
+ MachineFunctionPass::getAnalysisUsage(AU);\r
+ }\r
+\r
+ const X86Subtarget *STI;\r
+ const X86InstrInfo *TII;\r
+ const X86RegisterInfo *TRI;\r
+ const X86FrameLowering *X86FL;\r
+\r
+ bool runOnMachineFunction(MachineFunction &Fn) override;\r
+\r
+ const char *getPassName() const override {\r
+ return "X86 pseudo instruction expansion pass";\r
+ }\r
+\r
+private:\r
+ bool ExpandMI(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI);\r
+ bool ExpandMBB(MachineBasicBlock &MBB);\r
+};\r
+char X86ExpandPseudo::ID = 0;\r
+} // End anonymous namespace.\r
+\r
+/// If \p MBBI is a pseudo instruction, this method expands\r
+/// it to the corresponding (sequence of) actual instruction(s).\r
+/// \returns true if \p MBBI has been expanded.\r
+bool X86ExpandPseudo::ExpandMI(MachineBasicBlock &MBB,\r
+ MachineBasicBlock::iterator MBBI) {\r
+ MachineInstr &MI = *MBBI;\r
+ unsigned Opcode = MI.getOpcode();\r
+ DebugLoc DL = MBBI->getDebugLoc();\r
+ switch (Opcode) {\r
+ default:\r
+ return false;\r
+ case X86::TCRETURNdi:\r
+ case X86::TCRETURNri:\r
+ case X86::TCRETURNmi:\r
+ case X86::TCRETURNdi64:\r
+ case X86::TCRETURNri64:\r
+ case X86::TCRETURNmi64: {\r
+ bool isMem = Opcode == X86::TCRETURNmi || Opcode == X86::TCRETURNmi64;\r
+ MachineOperand &JumpTarget = MBBI->getOperand(0);\r
+ MachineOperand &StackAdjust = MBBI->getOperand(isMem ? 5 : 1);\r
+ assert(StackAdjust.isImm() && "Expecting immediate value.");\r
+\r
+ // Adjust stack pointer.\r
+ int StackAdj = StackAdjust.getImm();\r
+\r
+ if (StackAdj) {\r
+ // Check for possible merge with preceding ADD instruction.\r
+ StackAdj += X86FL->mergeSPUpdates(MBB, MBBI, true);\r
+ X86FL->emitSPUpdate(MBB, MBBI, StackAdj, /*InEpilogue=*/true);\r
+ }\r
+\r
+ // Jump to label or value in register.\r
+ bool IsWin64 = STI->isTargetWin64();\r
+ if (Opcode == X86::TCRETURNdi || Opcode == X86::TCRETURNdi64) {\r
+ unsigned Op = (Opcode == X86::TCRETURNdi)\r
+ ? X86::TAILJMPd\r
+ : (IsWin64 ? X86::TAILJMPd64_REX : X86::TAILJMPd64);\r
+ MachineInstrBuilder MIB = BuildMI(MBB, MBBI, DL, TII->get(Op));\r
+ if (JumpTarget.isGlobal())\r
+ MIB.addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),\r
+ JumpTarget.getTargetFlags());\r
+ else {\r
+ assert(JumpTarget.isSymbol());\r
+ MIB.addExternalSymbol(JumpTarget.getSymbolName(),\r
+ JumpTarget.getTargetFlags());\r
+ }\r
+ } else if (Opcode == X86::TCRETURNmi || Opcode == X86::TCRETURNmi64) {\r
+ unsigned Op = (Opcode == X86::TCRETURNmi)\r
+ ? X86::TAILJMPm\r
+ : (IsWin64 ? X86::TAILJMPm64_REX : X86::TAILJMPm64);\r
+ MachineInstrBuilder MIB = BuildMI(MBB, MBBI, DL, TII->get(Op));\r
+ for (unsigned i = 0; i != 5; ++i)\r
+ MIB.addOperand(MBBI->getOperand(i));\r
+ } else if (Opcode == X86::TCRETURNri64) {\r
+ BuildMI(MBB, MBBI, DL,\r
+ TII->get(IsWin64 ? X86::TAILJMPr64_REX : X86::TAILJMPr64))\r
+ .addReg(JumpTarget.getReg(), RegState::Kill);\r
+ } else {\r
+ BuildMI(MBB, MBBI, DL, TII->get(X86::TAILJMPr))\r
+ .addReg(JumpTarget.getReg(), RegState::Kill);\r
+ }\r
+\r
+ MachineInstr *NewMI = std::prev(MBBI);\r
+ NewMI->copyImplicitOps(*MBBI->getParent()->getParent(), MBBI);\r
+\r
+ // Delete the pseudo instruction TCRETURN.\r
+ MBB.erase(MBBI);\r
+\r
+ return true;\r
+ }\r
+ case X86::EH_RETURN:\r
+ case X86::EH_RETURN64: {\r
+ MachineOperand &DestAddr = MBBI->getOperand(0);\r
+ assert(DestAddr.isReg() && "Offset should be in register!");\r
+ const bool Uses64BitFramePtr =\r
+ STI->isTarget64BitLP64() || STI->isTargetNaCl64();\r
+ unsigned StackPtr = TRI->getStackRegister();\r
+ BuildMI(MBB, MBBI, DL,\r
+ TII->get(Uses64BitFramePtr ? X86::MOV64rr : X86::MOV32rr), StackPtr)\r
+ .addReg(DestAddr.getReg());\r
+ // The EH_RETURN pseudo is really removed during the MC Lowering.\r
+ return true;\r
+ }\r
+ case X86::IRET: {\r
+ // Adjust stack to erase error code\r
+ int64_t StackAdj = MBBI->getOperand(0).getImm();\r
+ X86FL->emitSPUpdate(MBB, MBBI, StackAdj, true);\r
+ // Replace pseudo with machine iret\r
+ BuildMI(MBB, MBBI, DL,\r
+ TII->get(STI->is64Bit() ? X86::IRET64 : X86::IRET32));\r
+ MBB.erase(MBBI);\r
+ return true;\r
+ }\r
+ case X86::EH_RESTORE: {\r
+ // Restore ESP and EBP, and optionally ESI if required.\r
+ bool IsSEH = isAsynchronousEHPersonality(classifyEHPersonality(\r
+ MBB.getParent()->getFunction()->getPersonalityFn()));\r
+ X86FL->restoreWin32EHStackPointers(MBB, MBBI, DL, /*RestoreSP=*/IsSEH);\r
+ MBBI->eraseFromParent();\r
+ return true;\r
+ }\r
+ }\r
+ llvm_unreachable("Previous switch has a fallthrough?");\r
+}\r
+\r
+/// Expand all pseudo instructions contained in \p MBB.\r
+/// \returns true if any expansion occurred for \p MBB.\r
+bool X86ExpandPseudo::ExpandMBB(MachineBasicBlock &MBB) {\r
+ bool Modified = false;\r
+\r
+ // MBBI may be invalidated by the expansion.\r
+ MachineBasicBlock::iterator MBBI = MBB.begin(), E = MBB.end();\r
+ while (MBBI != E) {\r
+ MachineBasicBlock::iterator NMBBI = std::next(MBBI);\r
+ Modified |= ExpandMI(MBB, MBBI);\r
+ MBBI = NMBBI;\r
+ }\r
+\r
+ return Modified;\r
+}\r
+\r
+bool X86ExpandPseudo::runOnMachineFunction(MachineFunction &MF) {\r
+ STI = &static_cast<const X86Subtarget &>(MF.getSubtarget());\r
+ TII = STI->getInstrInfo();\r
+ TRI = STI->getRegisterInfo();\r
+ X86FL = STI->getFrameLowering();\r
+\r
+ bool Modified = false;\r
+ for (MachineBasicBlock &MBB : MF)\r
+ Modified |= ExpandMBB(MBB);\r
+ return Modified;\r
+}\r
+\r
+/// Returns an instance of the pseudo instruction expansion pass.\r
+FunctionPass *llvm::createX86ExpandPseudoPass() {\r
+ return new X86ExpandPseudo();\r
+}\r
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