[Bug c/96165] New: internal compiler error during IPA pass: fnsummary

[jpalus+gcc at fastmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96165

            Bug ID: 96165
           Summary: internal compiler error during IPA pass: fnsummary
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jpalus+gcc at fastmail dot com
  Target Milestone: ---

Created attachment 48863
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48863&action=edit
preprocessed source file

During Mesa compilation gcc segfaults with:


    during IPA pass: fnsummary
    ../src/gallium/drivers/softpipe/sp_tex_sample.c: In function
‘sample_compare’:
    ../src/gallium/drivers/softpipe/sp_tex_sample.c:3862:1: internal compiler
error: Segmentation fault

Confirmed on both aarch64 and x86_64, note that issue occurs only if -O flag
was passed. Attached source file after preprocessor. Command to reproduce:

   gcc -O2 -c test.c -o test.o