return IsLP64 ? X86::LEA64r : X86::LEA32r;
}
-/// findDeadCallerSavedReg - Return a caller-saved register that isn't live
-/// when it reaches the "return" instruction. We can then pop a stack object
-/// to this register without worry about clobbering it.
-static unsigned findDeadCallerSavedReg(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- const X86RegisterInfo *TRI,
- bool Is64Bit) {
- const MachineFunction *MF = MBB.getParent();
- if (MF->callsEHReturn())
- return 0;
-
- const TargetRegisterClass &AvailableRegs = *TRI->getGPRsForTailCall(*MF);
-
- if (MBBI == MBB.end())
- return 0;
-
- switch (MBBI->getOpcode()) {
- default: return 0;
- case TargetOpcode::PATCHABLE_RET:
- case X86::RET:
- case X86::RETL:
- case X86::RETQ:
- case X86::RETIL:
- case X86::RETIQ:
- case X86::TCRETURNdi:
- case X86::TCRETURNri:
- case X86::TCRETURNmi:
- case X86::TCRETURNdi64:
- case X86::TCRETURNri64:
- case X86::TCRETURNmi64:
- case X86::EH_RETURN:
- case X86::EH_RETURN64: {
- SmallSet<uint16_t, 8> Uses;
- for (unsigned i = 0, e = MBBI->getNumOperands(); i != e; ++i) {
- MachineOperand &MO = MBBI->getOperand(i);
- if (!MO.isReg() || MO.isDef())
- continue;
- Register Reg = MO.getReg();
- if (!Reg)
- continue;
- for (MCRegAliasIterator AI(Reg, TRI, true); AI.isValid(); ++AI)
- Uses.insert(*AI);
- }
-
- for (auto CS : AvailableRegs)
- if (!Uses.count(CS) && CS != X86::RIP && CS != X86::RSP &&
- CS != X86::ESP)
- return CS;
- }
- }
-
- return 0;
-}
-
static bool isEAXLiveIn(MachineBasicBlock &MBB) {
for (MachineBasicBlock::RegisterMaskPair RegMask : MBB.liveins()) {
unsigned Reg = RegMask.PhysReg;
if (isSub && !isEAXLiveIn(MBB))
Reg = Rax;
else
- Reg = findDeadCallerSavedReg(MBB, MBBI, TRI, Is64Bit);
+ Reg = TRI->findDeadCallerSavedReg(MBB, MBBI);
unsigned MovRIOpc = Is64Bit ? X86::MOV64ri : X86::MOV32ri;
unsigned AddSubRROpc =
// need to find a dead register when using pop.
unsigned Reg = isSub
? (unsigned)(Is64Bit ? X86::RAX : X86::EAX)
- : findDeadCallerSavedReg(MBB, MBBI, TRI, Is64Bit);
+ : TRI->findDeadCallerSavedReg(MBB, MBBI);
if (Reg) {
unsigned Opc = isSub
? (Is64Bit ? X86::PUSH64r : X86::PUSH32r)
#include "X86Subtarget.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallSet.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
}
}
+unsigned X86RegisterInfo::findDeadCallerSavedReg(
+ MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI) const {
+ const MachineFunction *MF = MBB.getParent();
+ if (MF->callsEHReturn())
+ return 0;
+
+ const TargetRegisterClass &AvailableRegs = *getGPRsForTailCall(*MF);
+
+ if (MBBI == MBB.end())
+ return 0;
+
+ switch (MBBI->getOpcode()) {
+ default:
+ return 0;
+ case TargetOpcode::PATCHABLE_RET:
+ case X86::RET:
+ case X86::RETL:
+ case X86::RETQ:
+ case X86::RETIL:
+ case X86::RETIQ:
+ case X86::TCRETURNdi:
+ case X86::TCRETURNri:
+ case X86::TCRETURNmi:
+ case X86::TCRETURNdi64:
+ case X86::TCRETURNri64:
+ case X86::TCRETURNmi64:
+ case X86::EH_RETURN:
+ case X86::EH_RETURN64: {
+ SmallSet<uint16_t, 8> Uses;
+ for (unsigned I = 0, E = MBBI->getNumOperands(); I != E; ++I) {
+ MachineOperand &MO = MBBI->getOperand(I);
+ if (!MO.isReg() || MO.isDef())
+ continue;
+ Register Reg = MO.getReg();
+ if (!Reg)
+ continue;
+ for (MCRegAliasIterator AI(Reg, this, true); AI.isValid(); ++AI)
+ Uses.insert(*AI);
+ }
+
+ for (auto CS : AvailableRegs)
+ if (!Uses.count(CS) && CS != X86::RIP && CS != X86::RSP && CS != X86::ESP)
+ return CS;
+ }
+ }
+
+ return 0;
+}
+
Register X86RegisterInfo::getFrameRegister(const MachineFunction &MF) const {
const X86FrameLowering *TFI = getFrameLowering(MF);
return TFI->hasFP(MF) ? FramePtr : StackPtr;
int SPAdj, unsigned FIOperandNum,
RegScavenger *RS = nullptr) const override;
+ /// findDeadCallerSavedReg - Return a caller-saved register that isn't live
+ /// when it reaches the "return" instruction. We can then pop a stack object
+ /// to this register without worry about clobbering it.
+ unsigned findDeadCallerSavedReg(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI) const;
+
// Debug information queries.
Register getFrameRegister(const MachineFunction &MF) const override;
unsigned getPtrSizedFrameRegister(const MachineFunction &MF) const;