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Teach mode load folding and unfolding code about CMP32ri8 and friends.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104068 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-05-18 21:54:15 +00:00
parent 2abc93d0fb
commit f8c1ef0510
1 changed files with 9 additions and 3 deletions
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12
lib/Target/X86/X86InstrInfo.cpp
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@ -2598,9 +2598,9 @@ MachineInstr* X86InstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
switch (MI->getOpcode()) {
default: return NULL;
case X86::TEST8rr: NewOpc = X86::CMP8ri; break;
case X86::TEST16rr: NewOpc = X86::CMP16ri; break;
case X86::TEST32rr: NewOpc = X86::CMP32ri; break;
case X86::TEST64rr: NewOpc = X86::CMP64ri32; break;
case X86::TEST16rr: NewOpc = X86::CMP16ri8; break;
case X86::TEST32rr: NewOpc = X86::CMP32ri8; break;
case X86::TEST64rr: NewOpc = X86::CMP64ri8; break;
}
// Change to CMPXXri r, 0 first.
MI->setDesc(get(NewOpc));
@ -2808,16 +2808,22 @@ bool X86InstrInfo::unfoldMemoryOperand(MachineFunction &MF, MachineInstr *MI,
switch (DataMI->getOpcode()) {
default: break;
case X86::CMP64ri32:
case X86::CMP64ri8:
case X86::CMP32ri:
case X86::CMP32ri8:
case X86::CMP16ri:
case X86::CMP16ri8:
case X86::CMP8ri: {
MachineOperand &MO0 = DataMI->getOperand(0);
MachineOperand &MO1 = DataMI->getOperand(1);
if (MO1.getImm() == 0) {
switch (DataMI->getOpcode()) {
default: break;
case X86::CMP64ri8:
case X86::CMP64ri32: NewOpc = X86::TEST64rr; break;
case X86::CMP32ri8:
case X86::CMP32ri: NewOpc = X86::TEST32rr; break;
case X86::CMP16ri8:
case X86::CMP16ri: NewOpc = X86::TEST16rr; break;
case X86::CMP8ri: NewOpc = X86::TEST8rr; break;
}