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Re: [PATCH] teach phi-opt to produce -(a COND b)


Il 27/04/2012 18:43, H.J. Lu ha scritto:
> On Fri, Apr 27, 2012 at 3:01 AM, Paolo Bonzini <bonzini@gnu.org> wrote:
>> This patch teaches phiopt to look at phis whose arguments are -1 and 0,
>> and produce negated setcc statements.
>>
>> Bootstrapped/regtested x86_64-pc-linux-gnu, together with the patch
>> for pr53138.  Ok for mainline?
>>
>> Paolo
>>
>> 2012-04-27  Paolo Bonzini  <bonzini@gnu.org>
>>
>>        * tree-ssa-phiopt.c (conditional_replacement): Replace PHIs
>>        whose arguments are -1 and 0, by negating the result of the
>>        conditional.
>>
> 
> This caused:
> 
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53144

The bug exists even in 4.7.0, so in some sense it's a good thing that
the testsuite reminds about it. :)

Paolo


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