[Bug c/116791] New: ICE in operator[], at vec.h:910

[manuel.lauss at googlemail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116791

            Bug ID: 116791
           Summary: ICE in operator[], at vec.h:910
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: manuel.lauss at googlemail dot com
  Target Milestone: ---

Created attachment 59160
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59160&action=edit
compressed unreduced testcase

The attached unreduced testcase ICEs on AMD64:

gcc version 15.0.0 20240919 (experimental)
33ccc1314dcdb0b988a9276ca6b6ce9b07bea21e (Gentoo 15.0.9999 p, commit
d676863b64b58bf73a7f26eea70f81aeba517b13)

# gcc -c nine_ff.i -O2 -mavx2
during GIMPLE pass: vect
../mesa-9999/src/gallium/frontends/nine/nine_ff.c: In function
'nine_ff_update':
../mesa-9999/src/gallium/frontends/nine/nine_ff.c:2073:1: internal compiler
error: in operator[], at vec.h:910
 2073 | nine_ff_update(struct NineDevice9 *device)
      | ^~~~~~~~~~~~~~
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://bugs.gentoo.org/> for instructions.


-O2 -mavx2 are required to trigger it; -O1 or plain -mavx make it go away.

Thanks!
     Manuel