diff options
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.td | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td index 3f09cb0095..c25e0ebd6b 100644 --- a/lib/Target/X86/X86InstrInfo.td +++ b/lib/Target/X86/X86InstrInfo.td @@ -3700,15 +3700,21 @@ let Defs = [EFLAGS], isReMaterializable = 1, isAsCheapAsAMove = 1, def MOV8r0 : I<0x30, MRMInitReg, (outs GR8 :$dst), (ins), "xor{b}\t$dst, $dst", [(set GR8:$dst, 0)]>; + + def MOV32r0 : I<0x31, MRMInitReg, (outs GR32:$dst), (ins), + "xor{l}\t$dst, $dst", + [(set GR32:$dst, 0)]>; + // Use xorl instead of xorw since we don't care about the high 16 bits, // it's smaller, and it avoids a partial-register update. def MOV16r0 : I<0x31, MRMInitReg, (outs GR16:$dst), (ins), - "", [(set GR16:$dst, 0)]>; -def MOV32r0 : I<0x31, MRMInitReg, (outs GR32:$dst), (ins), - "xor{l}\t$dst, $dst", - [(set GR32:$dst, 0)]>; + "", [/*(set GR16:$dst, 0)*/]>; } +let AddedComplexity = 1 in +def : Pat<(i16 0), + (EXTRACT_SUBREG (MOV32r0), x86_subreg_16bit)>; + //===----------------------------------------------------------------------===// // Thread Local Storage Instructions // |