On Thu, Apr 28, 2016 at 5:42 PM, Jakub Jelinek wrote:
> Hi!
>
> Optimizing atomic_fetch_add followed by comparison into just testing
> the flags of the lock; sub is handled by a peephole2, which works usually
> fine, except that for -Os we have another peephole2 that transforms
> movl $-1, %reg in
Hi!
Optimizing atomic_fetch_add followed by comparison into just testing
the flags of the lock; sub is handled by a peephole2, which works usually
fine, except that for -Os we have another peephole2 that transforms
movl $-1, %reg into orl $-1, %reg and that causes the above mentioned
peephole2 not
