[Bug target/83687] [6/7 Regression] ARM NEON invalid optimisation for vabd/vabdl

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83687

--- Comment #5 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Wed Jan 17 11:51:03 2018
New Revision: 256791

URL: https://gcc.gnu.org/viewcvs?rev=256791&root=gcc&view=rev
Log:
[arm] PR target/83687: Fix invalid combination of VSUB + VABS into VABD

        Backport from mailine
        2018-01-15  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

        PR target/83687
        * config/arm/iterators.md (VF): New mode iterator.
        * config/arm/neon.md (neon_vabd<mode>_2): Use the above.
        Remove integer-related logic from pattern.
        (neon_vabd<mode>_3): Likewise.

        * gcc.target/arm/neon-combine-sub-abs-into-vabd.c: Delete integer
        tests.
        * gcc.target/arm/pr83687.c: New test.


Added:
    branches/gcc-7-branch/gcc/testsuite/gcc.target/arm/pr83687.c
Modified:
    branches/gcc-7-branch/gcc/ChangeLog
    branches/gcc-7-branch/gcc/config/arm/iterators.md
    branches/gcc-7-branch/gcc/config/arm/neon.md
    branches/gcc-7-branch/gcc/testsuite/ChangeLog
   
branches/gcc-7-branch/gcc/testsuite/gcc.target/arm/neon-combine-sub-abs-into-vabd.c