https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121830

            Bug ID: 121830
           Summary: ice in vect_build_slp_tree_2, again ?
           Product: gcc
           Version: 16.0
            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 62334
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62334&action=edit
C source code

The attached C code does this with recent gcc:

foundBugs $ ../results/bin/gcc -c -w -O1 bug1121.c
foundBugs $ ../results/bin/gcc -c -w -O2 bug1121.c
during GIMPLE pass: vect
runData/keep/in.45787.c: In function ‘main’:
runData/keep/in.45787.c:1884:5: internal compiler error: in
vect_build_slp_tree_2, at tree-vect-slp.cc:2857
0x1ef3d27 internal_error
       
/home/dcb42/gcc/working/gcc/../../trunk/gcc/diagnostic-global-context.cc:786
0x1efd3eb fancy_abort
        /home/dcb42/gcc/working/gcc/../../trunk/gcc/diagnostics/context.cc:1787
0xf89fbd vect_build_slp_tree_2
        /home/dcb42/gcc/working/gcc/../../trunk/gcc/tree-vect-slp.cc:2857

The bug first seems to occur sometime between g:d21f10259f64723f
and g:dea668daa2ea8f9d.

I will run a reduction.

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