diff options
| author | Chris Lattner <sabre@nondot.org> | 2005-01-02 04:18:17 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-01-02 04:18:17 +0000 |
| commit | 5aee0b97aa46cb25ccfe157a3a5612d155519b28 (patch) | |
| tree | fcd2eda7be0d57e9dad890058813f19744af87e0 /lib | |
| parent | bbdfaf8ec7d3d9ef4bbbc85778e1323d26461ab2 (diff) | |
Disable 2->3 address promotion of add and inc instructions to LEA's. In
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
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp index d588afe28a..a13498e3ae 100644 --- a/lib/Target/X86/X86InstrInfo.cpp +++ b/lib/Target/X86/X86InstrInfo.cpp @@ -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; |