[PATCH] i386: Add peephole2 for __atomic_sub_fetch (x, y, z) == 0 [PR98737]

[Ulrich Drepper]

On 1/27/21 11:37 AM, Jakub Jelinek wrote:
> Would equality comparison against 0 handle the most common cases.
> 
> The user can write it as
> __atomic_sub_fetch (x, y, z) == 0
> or
> __atomic_fetch_sub (x, y, z) - y == 0
> thouch, so the expansion code would need to be able to cope with both.

Please also keep !=0, <0, <=0, >0, and >=0 in mind.  They all can be
useful and can be handled with the flags.

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