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Fix for PR1348. If stack inc / dec amount is > 32-bits, issue a series of add / sub instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36456 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1023,6 +1023,30 @@ X86RegisterInfo::processFunctionBeforeFrameFinalized(MachineFunction &MF) const{
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}
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}
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/// emitSPUpdate - Emit a series of instructions to increment / decrement the
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/// stack pointer by a constant value.
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static
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void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
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unsigned StackPtr, int64_t NumBytes, bool Is64Bit,
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const TargetInstrInfo &TII) {
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bool isSub = NumBytes < 0;
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uint64_t Offset = isSub ? -NumBytes : NumBytes;
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unsigned Opc = isSub
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? ((Offset < 128) ?
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(Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) :
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(Is64Bit ? X86::SUB64ri32 : X86::SUB32ri))
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: ((Offset < 128) ?
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(Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) :
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(Is64Bit ? X86::ADD64ri32 : X86::ADD32ri));
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uint64_t Chunk = (1LL << 31) - 1;
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while (Offset) {
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uint64_t ThisVal = (Offset > Chunk) ? Chunk : Offset;
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BuildMI(MBB, MBBI, TII.get(Opc), StackPtr).addReg(StackPtr).addImm(ThisVal);
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Offset -= ThisVal;
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}
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}
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void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
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MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
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MachineBasicBlock::iterator MBBI = MBB.begin();
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@ -1075,11 +1099,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
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MBB.insert(MBBI, MI);
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}
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} else {
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unsigned Opc = (NumBytes < 128) ?
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(Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) :
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(Is64Bit ? X86::SUB64ri32 : X86::SUB32ri);
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MI= BuildMI(TII.get(Opc), StackPtr).addReg(StackPtr).addImm(NumBytes);
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MBB.insert(MBBI, MI);
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emitSPUpdate(MBB, MBBI, StackPtr, -(int64_t)NumBytes, Is64Bit, TII);
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}
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}
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@ -1206,19 +1226,8 @@ void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
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}
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}
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if (NumBytes > 0) {
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unsigned Opc = (NumBytes < 128) ?
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(Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) :
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(Is64Bit ? X86::ADD64ri32 : X86::ADD32ri);
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BuildMI(MBB, MBBI, TII.get(Opc), StackPtr)
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.addReg(StackPtr).addImm(NumBytes);
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} else if ((int)NumBytes < 0) {
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unsigned Opc = (-NumBytes < 128) ?
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(Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) :
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(Is64Bit ? X86::SUB64ri32 : X86::SUB32ri);
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BuildMI(MBB, MBBI, TII.get(Opc), StackPtr)
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.addReg(StackPtr).addImm(-NumBytes);
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}
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if (NumBytes)
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emitSPUpdate(MBB, MBBI, StackPtr, NumBytes, Is64Bit, TII);
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}
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}
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}
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