[llvm-commits] [PATCH] Update peephole optimization for ARM: modified OptimizeCompare

[Jim Grosbach]

Hi Manman,

There are subtleties here. See <rdar://problem/11081762>.

-Jim

On May 8, 2012, at 6:05 PM, Manman Ren wrote:

> 
> The purpose is to optimize the following cases:
> //       sub r1, r3
> //       cmp r3, r1 or cmp r1, r3
> //       bge L1
> 
> //      sub r1, imm
> //      cmp r1, imm
> //      bge L1
> 
> //     If the branch instruction can use flag from "sub", then we can eliminate
> //     the "cmp" instruction.
> 
> 
> Comments are welcome.
> 
> Thanks,
> Manman
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