re PR target/63503 ([AArch64] A57 executes fused multiply-add poorly in some situations)

re PR target/63503 ([AArch64] A57 executes fused multiply-add poorly in some situations)

2015-04-28  Thomas Preud'homme  <thomas.preudhomme@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.

From-SVN: r222512