[Bug tree-optimization/79534] [7 Regression] tree-ifcombine aarch64 performance regression with trunk@245151

jgreenhalgh at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Thu Apr 20 09:32:00 GMT 2017


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79534

--- Comment #10 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
The most striking improvement was in libquantum, for which we saw a 15%
performance improvement on Cortex-A72 (3% on cortex-A57) directly attributable
to basic block ordering after this patch.

Otherwise, I don't have a direct before/after comparison for just Honza's patch
across a wider set of benchmarks, but our nightly runs show general
improvements in benchmarks from Spec which are sensitive to block reordering
after the day of the patch. I don't see any large regressions in this time.


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