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Re: RFC: PATCH to genericize C++ loops to LOOP_EXPR instead of gotos

From: Jason Merrill <jason at redhat dot com>
To: Richard Biener <richard dot guenther at gmail dot com>
Cc: gcc-patches List <gcc-patches at gcc dot gnu dot org>
Date: Mon, 17 Nov 2014 13:21:48 -0500
Subject: Re: RFC: PATCH to genericize C++ loops to LOOP_EXPR instead of gotos
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References: <54683066 dot 40704 at redhat dot com> <CAFiYyc1fcq5dF4=B8Fk2x30d3AmSYUqes+UnfGM2vLn3Gigq9A at mail dot gmail dot com> <546A1351 dot 6070303 at redhat dot com> <CAFiYyc2vUV9_gKqEnShg9=keR9+K-iFVYUdkKs=SsEojOEiv1w at mail dot gmail dot com>

On 11/17/2014 10:27 AM, Richard Biener wrote:

The generated code for g++.dg/torture/pr37922.C is pretty different at -O2,
but it's hard for me to tell whether the changes are good, bad, or neutral.


There is always the possibility of running the C++ portion of SPEC CPU 2006...

I ran the tramp3d benchmark over 500 iterations before and after thechange and couldn't see any measurable difference in runtime. Thebinary with my change was 0.4% smaller.

I'm going to go ahead and check it in; if a performance hit shows up onthe automated testing we can revisit the choice.

References:
- RFC: PATCH to genericize C++ loops to LOOP_EXPR instead of gotos
  - From: Jason Merrill
- Re: RFC: PATCH to genericize C++ loops to LOOP_EXPR instead of gotos
  - From: Richard Biener
- Re: RFC: PATCH to genericize C++ loops to LOOP_EXPR instead of gotos
  - From: Jason Merrill
- Re: RFC: PATCH to genericize C++ loops to LOOP_EXPR instead of gotos
  - From: Richard Biener

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