diff options
| author | Manman Ren <mren@apple.com> | 2012-08-08 00:51:41 +0000 |
|---|---|---|
| committer | Manman Ren <mren@apple.com> | 2012-08-08 00:51:41 +0000 |
| commit | 39ad568c62f5120faec29f69d3d614303a1f992d (patch) | |
| tree | 4512b094b076453ca2fe06fa3a8a17fbe32f275b /lib/Target/X86/X86InstrArithmetic.td | |
| parent | 130e603115129ec1a6b94550a15f7caea0cbf068 (diff) | |
X86: enable CSE between CMP and SUB
We perform the following:
1> Use SUB instead of CMP for i8,i16,i32 and i64 in ISel lowering.
2> Modify MachineCSE to correctly handle implicit defs.
3> Convert SUB back to CMP if possible at peephole.
Removed pattern matching of (a>b) ? (a-b):0 and like, since they are handled
by peephole now.
rdar://11873276
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161462 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86InstrArithmetic.td')
| -rw-r--r-- | lib/Target/X86/X86InstrArithmetic.td | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/Target/X86/X86InstrArithmetic.td b/lib/Target/X86/X86InstrArithmetic.td index b6ba68fff0..f790611b8f 100644 --- a/lib/Target/X86/X86InstrArithmetic.td +++ b/lib/Target/X86/X86InstrArithmetic.td @@ -1132,8 +1132,10 @@ defm XOR : ArithBinOp_RF<0x30, 0x32, 0x34, "xor", MRM6r, MRM6m, X86xor_flag, xor, 1, 0>; defm ADD : ArithBinOp_RF<0x00, 0x02, 0x04, "add", MRM0r, MRM0m, X86add_flag, add, 1, 1>; +let isCompare = 1 in { defm SUB : ArithBinOp_RF<0x28, 0x2A, 0x2C, "sub", MRM5r, MRM5m, X86sub_flag, sub, 0, 0>; +} // Arithmetic. let Uses = [EFLAGS] in { |