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| author | Evan Cheng <evan.cheng@apple.com> | 2009-01-27 03:30:42 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-01-27 03:30:42 +0000 |
| commit | 6a86bd71df6114ce3435b6fda70573f8c1ff80cf (patch) | |
| tree | 4e40de51fbcc4837f84a94190e7ad36dd33d3866 /lib | |
| parent | ccc497f15223f146b8bdad265a6cd1604bf6f82f (diff) | |
| download | external_llvm-6a86bd71df6114ce3435b6fda70573f8c1ff80cf.zip external_llvm-6a86bd71df6114ce3435b6fda70573f8c1ff80cf.tar.gz external_llvm-6a86bd71df6114ce3435b6fda70573f8c1ff80cf.tar.bz2 | |
Implement multiple with overflow by 2 with an add instruction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63090 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.td | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td index 9649c23..f4a57be 100644 --- a/lib/Target/X86/X86InstrInfo.td +++ b/lib/Target/X86/X86InstrInfo.td @@ -3612,6 +3612,17 @@ def : Pat<(parallel (X86smul_ovf (load addr:$src1), i32immSExt8:$src2), (implicit EFLAGS)), (IMUL32rmi8 addr:$src1, i32immSExt8:$src2)>; +// Optimize multiple with overflow by 2. +let AddedComplexity = 2 in { +def : Pat<(parallel (X86smul_ovf GR16:$src1, 2), + (implicit EFLAGS)), + (ADD16rr GR16:$src1, GR16:$src1)>; + +def : Pat<(parallel (X86smul_ovf GR32:$src1, 2), + (implicit EFLAGS)), + (ADD32rr GR32:$src1, GR32:$src1)>; +} + //===----------------------------------------------------------------------===// // Floating Point Stack Support //===----------------------------------------------------------------------===// |