[llvm-commits] [PATCH] optimization of max-like struct for x86

[Sean Silva]

Why not turn it into e.g.

cmp ebx, eax
cmovg ebx, eax
sub ebx, eax

?

--Sean Silva



On Wed, Apr 25, 2012 at 12:33 PM, Manman Ren <mren at apple.com> wrote:

>
> This patch is intended to optimize the following cases for x86:
> (b > a) ? (b-a) : 0
> (a < b) ? (b-a) : 0
> It will use cmovs in generated x86 code.
>
> The patch modified one source file: lib/Target/X86/X86ISelLowering.cpp
>
> Please review & provide feedback.
> Thanks,
>
>
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