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| author | dim <dim@FreeBSD.org> | 2011-07-17 15:36:56 +0000 |
|---|---|---|
| committer | dim <dim@FreeBSD.org> | 2011-07-17 15:36:56 +0000 |
| commit | 1176aa52646fe641a4243a246aa7f960c708a274 (patch) | |
| tree | c8086addb211fa670a9d2b1038d8c2e453229755 /lib/Target/X86/X86InstrCompiler.td | |
| parent | ece02cd5829cea836e9365b0845a8ef042d17b0a (diff) | |
| download | FreeBSD-src-1176aa52646fe641a4243a246aa7f960c708a274.zip FreeBSD-src-1176aa52646fe641a4243a246aa7f960c708a274.tar.gz | |
Vendor import of llvm trunk r135360:
http://llvm.org/svn/llvm-project/llvm/trunk@135360
Diffstat (limited to 'lib/Target/X86/X86InstrCompiler.td')
| -rw-r--r-- | lib/Target/X86/X86InstrCompiler.td | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrCompiler.td b/lib/Target/X86/X86InstrCompiler.td index 33534cd..adcc747 100644 --- a/lib/Target/X86/X86InstrCompiler.td +++ b/lib/Target/X86/X86InstrCompiler.td @@ -1368,6 +1368,11 @@ def : Pat<(store (i8 (trunc_su (srl_su GR16:$src, (i8 8)))), addr:$dst), // (shl x, 1) ==> (add x, x) +// Note that if x is undef (immediate or otherwise), we could theoretically +// end up with the two uses of x getting different values, producing a result +// where the least significant bit is not 0. However, the probability of this +// happening is considered low enough that this is officially not a +// "real problem". def : Pat<(shl GR8 :$src1, (i8 1)), (ADD8rr GR8 :$src1, GR8 :$src1)>; def : Pat<(shl GR16:$src1, (i8 1)), (ADD16rr GR16:$src1, GR16:$src1)>; def : Pat<(shl GR32:$src1, (i8 1)), (ADD32rr GR32:$src1, GR32:$src1)>; |
