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Implement the isLoadFromStackSlot interface

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23387 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-19 05:23:44 +00:00
parent 7203e158da
commit a92aab74dd
2 changed files with 28 additions and 0 deletions
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25
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -92,6 +92,31 @@ void X86RegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
BuildMI(MBB, MI, Opc, 1, DestReg).addReg(SrcReg);
}
unsigned X86RegisterInfo::isLoadFromStackSlot(MachineInstr *MI,
int &FrameIndex) const {
switch (MI->getOpcode()) {
default: break;
case X86::MOV8rm:
case X86::MOV16rm:
case X86::MOV32rm:
case X86::FLD64m:
case X86::FLD80m:
case X86::MOVAPDrm:
case X86::MOVSDrm:
if (MI->getOperand(1).isFrameIndex() && MI->getOperand(2).isImmediate() &&
MI->getOperand(3).isRegister() && MI->getOperand(4).isImmediate() &&
MI->getOperand(2).getImmedValue() == 1 &&
MI->getOperand(3).getReg() == 0 &&
MI->getOperand(4).getImmedValue() == 0) {
FrameIndex = MI->getOperand(1).getFrameIndex();
return MI->getOperand(0).getReg();
}
break;
}
return 0;
}
static MachineInstr *MakeMInst(unsigned Opcode, unsigned FrameIndex,
MachineInstr *MI) {
return addFrameReference(BuildMI(Opcode, 4), FrameIndex);

3
lib/Target/X86/X86RegisterInfo.h
View File

@ -39,6 +39,9 @@ struct X86RegisterInfo : public X86GenRegisterInfo {
unsigned DestReg, unsigned SrcReg,
const TargetRegisterClass *RC) const;
unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const;
/// foldMemoryOperand - If this target supports it, fold a load or store of
/// the specified stack slot into the specified machine instruction for the
/// specified operand. If this is possible, the target should perform the