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Re: [PATCH x86] Increase PARAM_MAX_COMPLETELY_PEELED_INSNS when branch is costly
- From: Eric Botcazou <ebotcazou at adacore dot com>
- To: Uros Bizjak <ubizjak at gmail dot com>
- Cc: gcc-patches at gcc dot gnu dot org, Evgeny Stupachenko <evstupac at gmail dot com>, Jan Hubicka <hubicka at ucw dot cz>, Richard Biener <richard dot guenther at gmail dot com>
- Date: Sat, 22 Nov 2014 10:49:52 +0100
- Subject: Re: [PATCH x86] Increase PARAM_MAX_COMPLETELY_PEELED_INSNS when branch is costly
- Authentication-results: sourceware.org; auth=none
- References: <CAOvf_xwBqY++PGRC_+1=rzHO18jvc+TP5mmR=PjYvGgm=63NuA at mail dot gmail dot com> <CAOvf_xxUaOkzzyVZp1nzq8Uw63tfuTyneSzhkoLwanzVw32_4g at mail dot gmail dot com> <CAFULd4Yo2FByv26QYEEOv2NN2n=sdFcuGmP+sd3j88n-xjbqRw at mail dot gmail dot com>
> OK. Looks like a good performance vs. codesize tradeoff.
Yes, but IMO this should be done in the generic code, unrolling small loops is
profitable on most architectures.
--
Eric Botcazou