[Bug tree-optimization/98854] New: [11 Regression] cray benchmark is about 15% slower since r11-4428-g4a369d199bf2f34e

[marxin at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98854

            Bug ID: 98854
           Summary: [11 Regression] cray benchmark is about 15% slower
                    since r11-4428-g4a369d199bf2f34e
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---

Since the revision, the following is slower on znver2:

$ make clean && m CFLAGS="-Ofast -march=znver2 -g" && cat sphfract | ./c-ray-mt
-o /dev/null
c-ray-mt v1.1
Rendering took: 1 seconds (1798 milliseconds)

while GCC 10 has:

c-ray-mt v1.1
Rendering took: 1 seconds (1585 milliseconds)