[Bug c/110874] New: ice with -O2 with recent gcc

["dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110874

            Bug ID: 110874
           Summary: ice with -O2 with recent gcc
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 55675
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55675&action=edit
C source code

The attached C code, when compiled by recent gcc trunk and -O2, does this:

foundBugs $ ~/gcc/results/bin/gcc -c -w -O2 bug945.c
buildData/keep/in.18686.c: In function ‘func_56’:
buildData/keep/in.18686.c:1184:17: note: the ABI for passing parameters with
32-byte alignment has changed in GCC 4.6
gcc: internal compiler error: Segmentation fault signal terminated program cc1
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://gcc.gnu.org/bugs/> for instructions.
foundBugs $ 

-O1 is fine:

foundBugs $ ~/gcc/results/bin/gcc -c -w -O1 bug945.c
buildData/keep/in.18686.c: In function ‘func_56’:
buildData/keep/in.18686.c:1184:17: note: the ABI for passing parameters with
32-byte alignment has changed in GCC 4.6
foundBugs $ 

Yesterday's compiler (g:01b0c36ba0c3bbe6) seems fine, but today's
(g:0460c1221627938b),
some 36 commits later, does not.

I have a reduction running.

It seems a side issue that -w was given to the compiler, but it still prints
out notes about things that happened a long time ago (gcc 4.6).