[Bug target/63503] [AArch64] A57 executes fused multiply-add poorly in some situations

[thopre01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63503

--- Comment #25 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
Author: thopre01
Date: Tue Apr 28 08:10:44 2015
New Revision: 222512

URL: https://gcc.gnu.org/viewcvs?rev=222512&root=gcc&view=rev
Log:
2015-04-28  Thomas Preud'homme  <thomas.preudho...@arm.com>

    gcc/
    PR target/63503
    * config.gcc: Add cortex-a57-fma-steering.o to extra_objs for
    aarch64-*-*.
    * config/aarch64/t-aarch64: Add a rule for cortex-a57-fma-steering.o.
    * config/aarch64/aarch64.h (AARCH64_FL_USE_FMA_STEERING_PASS): Define.
    (AARCH64_TUNE_FMA_STEERING): Likewise.
    * config/aarch64/aarch64-cores.def: Set
    AARCH64_FL_USE_FMA_STEERING_PASS for cores with dynamic steering of
    FMUL/FMADD instructions.
    * config/aarch64/aarch64.c (aarch64_register_fma_steering): Declare.
    (aarch64_override_options): Include cortex-a57-fma-steering.h. Call
    aarch64_register_fma_steering () if AARCH64_TUNE_FMA_STEERING is true.
    * config/aarch64/cortex-a57-fma-steering.h: New file.
    * config/aarch64/cortex-a57-fma-steering.c: Likewise.

Added:
    trunk/gcc/config/aarch64/cortex-a57-fma-steering.c
    trunk/gcc/config/aarch64/cortex-a57-fma-steering.h
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config.gcc
    trunk/gcc/config/aarch64/aarch64-cores.def
    trunk/gcc/config/aarch64/aarch64.c
    trunk/gcc/config/aarch64/aarch64.h
    trunk/gcc/config/aarch64/t-aarch64