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[X86] Remove -x86-experimental-vector-widening-legalization command line flag

Authored by craig.topper on Sep 29 2019, 4:32 PM.

Description

[X86] Remove -x86-experimental-vector-widening-legalization command line flag

This was added back to allow some performance regressions to be
investigated. The main perf issue was fixed shortly after adding
this back and no other major issues have been reported. So I
think its safe to remove this again.

llvm-svn: 373174

Details

Event Timeline

troyj added a subscriber: troyj.Oct 16 2019, 1:19 PM

Craig, the pass still causes an 8% performance degradation for SPEC CPU 2017 imagick on skylake. Just FYI in case you want to investigate.