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INC64_32r -> LEA64_32r is better than INC64_32r -> LEA32r, but it still can

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cause performance degradation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42653 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-10-05 21:55:32 +00:00
parent 559dc46d46
commit b75ed322c4
1 changed files with 4 additions and 8 deletions
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12
lib/Target/X86/X86InstrInfo.cpp
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@ -283,11 +283,9 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
switch (MIOpc) {
default: return 0;
case X86::INC64r:
case X86::INC32r:
case X86::INC64_32r: {
case X86::INC32r: {
assert(MI->getNumOperands() >= 2 && "Unknown inc instruction!");
unsigned Opc = MIOpc == X86::INC64r ? X86::LEA64r
: (MIOpc == X86::INC64_32r ? X86::LEA64_32r : X86::LEA32r);
unsigned Opc = MIOpc == X86::INC64r ? X86::LEA64r : X86::LEA32r;
NewMI = addRegOffset(BuildMI(get(Opc), Dest), Src, 1);
break;
}
@ -298,11 +296,9 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
NewMI = addRegOffset(BuildMI(get(X86::LEA16r), Dest), Src, 1);
break;
case X86::DEC64r:
case X86::DEC32r:
case X86::DEC64_32r: {
case X86::DEC32r: {
assert(MI->getNumOperands() >= 2 && "Unknown dec instruction!");
unsigned Opc = MIOpc == X86::DEC64r ? X86::LEA64r
: (MIOpc == X86::DEC64_32r ? X86::LEA64_32r : X86::LEA32r);
unsigned Opc = MIOpc == X86::DEC64r ? X86::LEA64r : X86::LEA32r;
NewMI = addRegOffset(BuildMI(get(Opc), Dest), Src, -1);
break;
}