[Bug target/83628] performance regression when accessing arrays on alpha

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83628

--- Comment #3 from uros at gcc dot gnu.org ---
Author: uros
Date: Thu Jan  4 09:42:01 2018
New Revision: 256228

URL: https://gcc.gnu.org/viewcvs?rev=256228&root=gcc&view=rev
Log:
        PR target/83628
        * config/alpha/alpha.md (*sadd<modesuffix>): Use ASHIFT
        instead of MULT rtx.  Update all corresponding splitters.
        (*saddl_se): Ditto.
        (*ssub<modesuffix>): Ditto.
        (*ssubl_se): Ditto.
        (*cmp_sadd_di): Update split patterns.
        (*cmp_sadd_si): Ditto.
        (*cmp_sadd_sidi): Ditto.
        (*cmp_ssub_di): Ditto.
        (*cmp_ssub_si): Ditto.
        (*cmp_ssub_sidi): Ditto.
        * config/alpha/predicates.md (const23_operand): New predicate.
        * config/alpha/alpha.c (alpha_rtx_costs) [PLUS, MINUS]:
        Look for ASHIFT, not MULT inner operand.
        (alpha_split_conditional_move): Update for *sadd<modesuffix> change.

testsuite/ChangeLog:

        PR target/83628
        * gcc.target/alpha/pr83628-1.c: New test.
        * gcc.target/alpha/pr83628-2.c: Ditto.


Added:
    trunk/gcc/testsuite/gcc.target/alpha/pr83628-1.c
    trunk/gcc/testsuite/gcc.target/alpha/pr83628-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/alpha/alpha.c
    trunk/gcc/config/alpha/alpha.md
    trunk/gcc/config/alpha/predicates.md
    trunk/gcc/testsuite/ChangeLog