[Bug target/91275] __builtin_crypto_vpmsumd gives different results -O[123] vs -O0

[wschmidt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91275

--- Comment #12 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Committed to trunk with 276410.  Forgot to annotate the ChangeLog with the PR,
so here it is:

[gcc]

2019-10-01  Bill Schmidt  <wschmidt@linux.ibm.com>

        * config/rs6000/rs6000-p8swap.c (rtx_is_swappable_p): Don't swap
        vpmsumd.

[gcc/testsuite]

2019-10-01  Bill Schmidt  <wschmdit@linux.ibm.com>

        * gcc.target/powerpc/pr91275.c: New.