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Re: PATCH] Fix PR 31531: A microoptimization of isnegative of signed integer
- From: Senthil Kumar Selvaraj <senthil_kumar dot selvaraj at atmel dot com>
- To: "Hurugalawadi, Naveen" <Naveen dot Hurugalawadi at caviumnetworks dot com>
- Cc: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, "Pinski, Andrew" <Andrew dot Pinski at caviumnetworks dot com>
- Date: Mon, 8 Feb 2016 14:46:25 +0530
- Subject: Re: PATCH] Fix PR 31531: A microoptimization of isnegative of signed integer
- Authentication-results: sourceware.org; auth=none
- References: <SN2PR0701MB1024F7BEE5230333B12BAA888ED50 at SN2PR0701MB1024 dot namprd07 dot prod dot outlook dot com>
Hurugalawadi, Naveen writes:
> Hi,
>
> Please find attached the patch that performs optimization on unsigned values.
>
> Original fold-const part implemented in match.pd.
>
> Please review the patch and let us know if it's OK?
>
> Regression Tested on X86_64 with no regressions.
>
> Thanks,
> Naveen
>
> ChangeLog:
> * match.pd (cmp (convert (bit_not @0)) INTEGER_CST@1): New Simplifier.
>
> Testsuite/ChangeLog:
> * gcc.dg/pr31531.c : New testcase.
Could you please add dg-require-effective-target int32 to the test to
avoid breaking targets with smaller ints (right shift by 31 bits)?
Regards
Senthil