[LLVMdev] Performance regression on ARM (original) (raw)

Chandler Carruth chandlerc at google.com
Thu Oct 16 23:19:16 PDT 2014

On Thu, Oct 16, 2014 at 9:56 PM, Adam Nemet <anemet at apple.com> wrote:

> On Oct 16, 2014, at 3:04 AM, Renato Golin <renato.golin at linaro.org> wrote: > > On 16 October 2014 09:34, Hal Finkel <hfinkel at anl.gov> wrote: >> Interesting. Looks like the problem is in (219545, 219569]. > > Yes.

Chandler’s complex arithmetic changes are also in the range: r219557 in clang. We saw it change the code in mandel-2 significantly.

I would not at all be surprised by regression in some cases here.

Complex arithmetic with reals got much faster. Complex arithmetic with other complex numbers may have gotten slower. If there were fastmath flags, crazy preposterously slower.

Note that I have a patch out needing review which addresses most of the regression in this case, and should address all of the regressions if fastmath flags are in play. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20141016/3dceba98/attachment.html>

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