https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69274
Bug ID: 69274
Summary: [6 Regression] Performance regression after r231814
on x86 Haswell.
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ysrumyan at gmail dot com
Target Milestone: ---
After this simple fix we got huge regression ( > 16%) for spec2006/435.gromacs
on Haswell with "-O2 -ffast-math" options. Preliminary investigation have shown
that 1he size of the hottest loop in benchmark (fsettle) became 10 instructions
shorter (less spill/fill) but performance regressed significantly . Note that
adding the first scheduler by "-fschedule-insns --param
sched-pressure-algorithm=2 -fsched-pressure" gave us +24% speed-up (but only
for this particular benchmark).
