https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123152

David Binderman <dcb314 at hotmail dot com> changed:

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                 CC|                            |dcb314 at hotmail dot com

--- Comment #4 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to Tamar Christina from comment #2)
> can reproduce on AArch64 with just -O3

I see this on x86_64 with -O3 -march=znver3:

SPECS $ ~/gcc/results/bin/gcc -c -w  -O3 -march=znver3 bug1164.c
stb_vorbis.c: In function ‘stb_vorbis_seek_frame’:
stb_vorbis.c:4880:5: error: dominator of 157 should be 318, not 320
during GIMPLE pass: vect
stb_vorbis.c:4880:5: internal compiler error: in verify_dominators, at
dominance.cc:1194
0x1f837e7 internal_error
       
/home/dcb42/gcc/working/gcc/../../trunk/gcc/diagnostic-global-context.cc:787
0x1f8d02b fancy_abort
        /home/dcb42/gcc/working/gcc/../../trunk/gcc/diagnostics/context.cc:1805
0x695edc verify_dominators
        /home/dcb42/gcc/working/gcc/../../trunk/gcc/dominance.cc:1194

I will have a go at generating a smaller testcase.

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