[llvm-commits] [llvm] r131455 - /llvm/trunk/lib/Target/X86/README.txt

[pageexec at freemail.hu]

On 17 May 2011 at 7:22, Chris Lattner wrote:

> +into:
> +	movl	$-1, %eax
> +	lock
> +	xaddl	%eax, (%rdi)
> +	cmpl	$1, %eax
> +	je	LBB0_2
> +
> +Instead we could generate:
> +
> +	lock
> +	dec %rdi
           ^^^^

you probably meant dec (%rdi) ?

> +	je LBB0_2
> +
> +The trick is to match "fetch_and_add(X, -C) == C".