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| author | Evan Cheng <evan.cheng@apple.com> | 2009-05-12 00:07:35 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-05-12 00:07:35 +0000 |
| commit | 55173b7646e0e4308e1579e21d5d786e1678765d (patch) | |
| tree | 90fe66883da3f70684180895b127b2339a6798ce /llvm/lib/Target/X86/X86CodeEmitter.cpp | |
| parent | 6c60dbb3cb3fe8975dbc1cf29662f40dca1c1130 (diff) | |
| download | bcm5719-llvm-55173b7646e0e4308e1579e21d5d786e1678765d.tar.gz bcm5719-llvm-55173b7646e0e4308e1579e21d5d786e1678765d.zip | |
Avoid unneeded SIB byte encoding. Patch by Zoltan Varga.
llvm-svn: 71520
Diffstat (limited to 'llvm/lib/Target/X86/X86CodeEmitter.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86CodeEmitter.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86CodeEmitter.cpp b/llvm/lib/Target/X86/X86CodeEmitter.cpp index c21eacc9a4c..63bf18d157f 100644 --- a/llvm/lib/Target/X86/X86CodeEmitter.cpp +++ b/llvm/lib/Target/X86/X86CodeEmitter.cpp @@ -338,7 +338,8 @@ void Emitter::emitMemModRMByte(const MachineInstr &MI, unsigned BaseReg = Base.getReg(); // Is a SIB byte needed? - if ((!Is64BitMode || DispForReloc) && IndexReg.getReg() == 0 && + if ((!Is64BitMode || DispForReloc || BaseReg != 0) && + IndexReg.getReg() == 0 && (BaseReg == 0 || getX86RegNum(BaseReg) != N86::ESP)) { if (BaseReg == 0) { // Just a displacement? // Emit special case [disp32] encoding |
