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| author | Evan Cheng <evan.cheng@apple.com> | 2006-01-19 01:56:29 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2006-01-19 01:56:29 +0000 |
| commit | 68b951a5e5c8e3e36fd64af3c56a5d2b53d1bfaf (patch) | |
| tree | f317056094a8ae62e5f161004ec5a47f6058a6d9 /lib/Target/X86/X86InstrInfo.td | |
| parent | b4ad33c4aedc124f956ff6866fc73db14be534ee (diff) | |
| download | external_llvm-68b951a5e5c8e3e36fd64af3c56a5d2b53d1bfaf.zip external_llvm-68b951a5e5c8e3e36fd64af3c56a5d2b53d1bfaf.tar.gz external_llvm-68b951a5e5c8e3e36fd64af3c56a5d2b53d1bfaf.tar.bz2 | |
Two peepholes:
(or (x >> c) | (y << (32 - c))) ==> (shrd x, y, c)
(or (x << c) | (y >> (32 - c))) ==> (shld x, y, c)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25438 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86InstrInfo.td')
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.td | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td index 958aa09..741e7d1 100644 --- a/lib/Target/X86/X86InstrInfo.td +++ b/lib/Target/X86/X86InstrInfo.td @@ -3066,3 +3066,13 @@ def : Pat<(f64 (undef)), (FpLD0)>, Requires<[FPStack]>; def : Pat<(shl R8 :$src1, (i8 1)), (ADD8rr R8 :$src1, R8 :$src1)>; def : Pat<(shl R16:$src1, (i8 1)), (ADD16rr R16:$src1, R16:$src1)>; def : Pat<(shl R32:$src1, (i8 1)), (ADD32rr R32:$src1, R32:$src1)>; + +// (or (x >> c) | (y << (32 - c))) ==> (shrd x, y, c) +def : Pat<(or (srl R32:$src1, CL:$amt), + (shl R32:$src2, (sub 32, CL:$amt))), + (SHRD32rrCL R32:$src1, R32:$src2)>; + +// (or (x << c) | (y >> (32 - c))) ==> (shld x, y, c) +def : Pat<(or (shl R32:$src1, CL:$amt), + (srl R32:$src2, (sub 32, CL:$amt))), + (SHLD32rrCL R32:$src1, R32:$src2)>; |