[Bug tree-optimization/97744] New: [11 regression] floating point result errors after r11-4637

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97744

            Bug ID: 97744
           Summary: [11 regression] floating point result errors after
                    r11-4637
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

g:f5e18dd9c7dacc9671044fc669bd5c1b26b6bdba, r11-4637 

This revision causes errors in the 32 bit run of the 172.mgrid test case, part
of spec 2000.

Running Benchmarks
  Running 172.mgrid ref base wds_test_32 default
*** Miscompare of mgrid.out, see
cpu2000/benchspec/CFP2000/172.mgrid/run/00000011/mgrid.out.mis
  Running 172.mgrid ref base wds_test_32 default
*** Miscompare of mgrid.out, see
cpu2000/benchspec/CFP2000/172.mgrid/run/00000011/mgrid.out.mis
  Running 172.mgrid ref base wds_test_32 default
*** Miscompare of mgrid.out, see
cpu2000/benchspec/CFP2000/172.mgrid/run/00000011/mgrid.out.mis
Error: 3x172.mgrid

cat cpu2000/benchspec/CFP2000/172.mgrid/run/00000011/mgrid.out.mis
12732:      0.620103E-12
          -0.425977E-12
                      ^
12733:      0.620103E-12
          -0.425977E-12
                      ^
12734:      0.627531E-12
          -0.431079E-12
                      ^
12735:      0.627531E-12
          -0.431079E-12
                      ^
12736:      0.629423E-12
          -0.432379E-12
                      ^
12737:      0.629423E-12
          -0.432379E-12
                      ^
12738:      0.629932E-12
          -0.432729E-12
                      ^