[Bug rtl-optimization/68796] Make use of and-immediate+compare instructions more robust

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68796

--- Comment #3 from ktkachov at gcc dot gnu.org ---
Author: ktkachov
Date: Mon Jan 11 14:44:22 2016
New Revision: 232228

URL: https://gcc.gnu.org/viewcvs?rev=232228&root=gcc&view=rev
Log:
[AArch64] PR rtl-optimization/68796: Add patterns for QImode and HImode
comparison with zero

        PR rtl-optimization/68796
        * config/aarch64/aarch64.md (*and<mode>_compare0): New pattern.
        * config/aarch64/aarch64.c (aarch64_select_cc_mode): Handle HImode
        and QImode comparisons against zero with CC_NZmode.
        * config/aarch64/iterators.md (short_mask): New mode_attr.

        * gcc.target/aarch64/tst_5.c: New test.
        * gcc.target/aarch64/tst_6.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.target/aarch64/tst_5.c
    trunk/gcc/testsuite/gcc.target/aarch64/tst_6.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/aarch64/aarch64.c
    trunk/gcc/config/aarch64/aarch64.md
    trunk/gcc/config/aarch64/iterators.md
    trunk/gcc/testsuite/ChangeLog