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Re: [PATCH] Change PRED_LOOP_EXIT from 85 to 92
- From: Segher Boessenkool <segher at kernel dot crashing dot org>
- To: David Esparza <david dot esparza dot borquez at intel dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Sat, 23 Dec 2017 16:08:16 -0600
- Subject: Re: [PATCH] Change PRED_LOOP_EXIT from 85 to 92
- Authentication-results: sourceware.org; auth=none
- References: <20171222225347.18748-1-david.esparza.borquez@intel.com>
On Fri, Dec 22, 2017 at 04:53:47PM -0600, David Esparza wrote:
> With a value of 85 GCC has a CPU performance degradation of 11%,
> reverting PRED_LOOP_EXIT to 92 this degradation disappear.
> Those values where measured by running c-ray ray-tracer that is a
> floating point benchmark that runs out of L1 cache.
Why is this single benchmark more important than everything else?
https://patchwork.ozlabs.org/patch/637073/
Segher