[Bug target/91481] POWER9 "DARN" RNG intrinsic produces repeated output

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91481

--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Fri Aug 30 13:51:26 2019
New Revision: 275175

URL: https://gcc.gnu.org/viewcvs?rev=275175&root=gcc&view=rev
Log:
        Backport from trunk
        2019-08-22  Segher Boessenkool  <seg...@kernel.crashing.org>

        PR target/91481
        * config/rs6000/rs6000.md (unspec): Delete UNSPEC_DARN, UNSPEC_DARN_32,
        and UNSPEC_DARN_RAW.
        (unspecv): New enumerator values UNSPECV_DARN, UNSPECV_DARN_32, and
        UNSPECV_DARN_RAW.
        (darn_32): Use an unspec_volatile, and UNSPECV_DARN_32.
        (darn_raw): Use an unspec_volatile, and UNSPECV_DARN_RAW.
        (darn): Use an unspec_volatile, and UNSPECV_DARN.

Modified:
    branches/gcc-9-branch/gcc/ChangeLog
    branches/gcc-9-branch/gcc/config/rs6000/rs6000.md