[llvm-commits] [PATCH] Replace SUB with CMP if possible on X86

[Manman Ren]

Hi All,

This patch is to optimize generated code from
	movq	%rdi, %rax
	subq	%rsi, %rax
	cmovsq	%rsi, %rdi
	movq	%rdi, %rax
	
to
	cmpq	%rsi, %rdi
	cmovsq	%rsi, %rdi
	movq	%rdi, %rax

The only criterion to perform this optimization is that the actual result of SUB is not used.

Thanks,
Manman

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