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Disable 2->3 address promotion of add and inc instructions to LEA's. In

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addition to being three address, LEA's don't set the flags.

This fixes 186.crafty.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19251 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-02 04:18:17 +00:00
parent bbdfaf8ec7
commit 5aee0b97aa
1 changed files with 5 additions and 0 deletions
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5
lib/Target/X86/X86InstrInfo.cpp
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@ -55,6 +55,11 @@ MachineInstr *X86InstrInfo::convertToThreeAddress(MachineInstr *MI) const {
unsigned Dest = MI->getOperand(0).getReg();
unsigned Src = MI->getOperand(1).getReg();
// FIXME: None of these instructions are promotable to LEAs without
// additional information. In particular, LEA doesn't set the flags that
// add and inc do. :(
return 0;
// FIXME: 16-bit LEA's are really slow on Athlons, but not bad on P4's. When
// we have subtarget support, enable the 16-bit LEA generation here.
bool DisableLEA16 = true;