https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106012
Bug ID: 106012
Summary: rsqrtss instruction generated even if -mno-recip
specified
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: vincenzo.innocente at cern dot ch
Target Milestone: ---
with option -Ofast -mno-recip rsqrtss instruction is still generated.
https://godbolt.org/z/hGxrG7xPh
inhibiting rsqrtss and rcpss is critical to obtain identical results when
running on INTEL and AMD platforms. Having to inhibit Ofast is clearly a larger
performance penalty.
