> URL: http://llvm.org/viewvc/llvm-project?rev=42661&view=rev
> Log:
> Commute x86 cmove instructions by swapping the operands and change
> the condition
> to its inverse.
> Testing this as llcbeta
Random crazy idea:
> +def CMOVB16rm : I<0x42, MRMSrcMem, // if <u, GR16 = [mem16]
> + (outs GR16:$dst), (ins GR16:$src1, i16mem:$src2),
> + "cmovb\t{$src2, $dst|$dst, $src2}",
> + [(set GR16:$dst, (X86cmov GR16:$src1, (loadi16
> addr:$src2),
> + X86_COND_B, EFLAGS))]>,
> + TB, OpSize;
Instead of having one instruction for each comparison code, would it
make sense to have one "CMOV16rm" that took the condcode as an
immediate argument? If you had that, you could change the comparison
just by twiddling the immediate operand and wouldn't have a bazillion
CMOV instructions.
-Chris
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