Hi Benedikt, I ran SPEC2006 fp with your previous patch (v2) for cortex-a57. Gromacs gains ~5% for -mcpu=cortex-a57 -Ofast and gains ~11% with -mcpu=cortex-a57 -Ofast -mlow-precision-recip-sqrt. Other FP benchmarks were within noise.
However I will leave it for Aarch64 maintainers to decide on the default tuning. Regards, Venkat. > -----Original Message----- > From: Benedikt Huber [mailto:benedikt.hu...@theobroma-systems.com] > Sent: Wednesday, July 29, 2015 11:18 PM > To: gcc-patches@gcc.gnu.org > Cc: philipp.toms...@theobroma-systems.com; Kumar, Venkataramanan; > pins...@gmail.com; e.mene...@samsung.com; Benedikt Huber > Subject: [PATCH v3][aarch64] Implemented reciprocal square root (rsqrt) > estimation in -ffast-math > > This third revision of the patch: > * makes -mrecip default value specified per core. > * disables rsqrt when -Os is given. > > Ok for check in. > > Benedikt Huber (1): > 2015-07-29 Benedikt Huber <benedikt.hu...@theobroma-systems.com> > Philipp Tomsich <philipp.toms...@theobroma-systems.com> > > gcc/ChangeLog | 19 ++++ > gcc/config/aarch64/aarch64-builtins.c | 103 ++++++++++++++++++++ > gcc/config/aarch64/aarch64-opts.h | 7 ++ > gcc/config/aarch64/aarch64-protos.h | 3 + > gcc/config/aarch64/aarch64-simd.md | 27 ++++++ > gcc/config/aarch64/aarch64.c | 81 ++++++++++++++-- > gcc/config/aarch64/aarch64.md | 3 + > gcc/config/aarch64/aarch64.opt | 8 ++ > gcc/doc/invoke.texi | 19 ++++ > gcc/testsuite/gcc.target/aarch64/rsqrt-asm-check.c | 63 ++++++++++++ > gcc/testsuite/gcc.target/aarch64/rsqrt.c | 107 > +++++++++++++++++++++ > 11 files changed, 434 insertions(+), 6 deletions(-) create mode 100644 > gcc/testsuite/gcc.target/aarch64/rsqrt-asm-check.c > create mode 100644 gcc/testsuite/gcc.target/aarch64/rsqrt.c > > -- > 1.9.1
