From 4f2a94e68ebd12c85a98c4cf3e840c61094aad34 Mon Sep 17 00:00:00 2001 From: Luis Machado Date: Fri, 17 Nov 2017 16:03:37 +0000 Subject: [PATCH] [AArch64] Adjust tuning parameters for Falkor Disabling software prefetching and switching the autoprefetcher to weak improves CPU2017 rate and speed benchmarks for both int and fp sets on Falkor. SPECrate 2017 fp is up 0.38% SPECspeed 2017 fp is up 0.54% SPECrate 2017 int is up 3.02% SPECspeed 2017 int is up 3.16% There are only a couple individual regressions. The biggest one being about 4% in parest. For SPEC2006, we've noticed the following: SPECint is up 0.91% SPECfp is stable In the case of SPEC2006 we noticed both a big regression in mcf (about 20%) and a big improvement for hmmer (about 40%). Since the overall result is positive, we would like to make these new tuning settings the default for Falkor. We may revisit the software prefetcher setting in the future, in case we can adjust it enough so it provides us a good balance between improvements and regressions (mcf). But for now it is best if it stays off. 2017-11-17 Luis Machado gcc/ * config/aarch64/aarch64.c (qdf24xx_prefetch_tune) : Set to -1. (qdf24xx_tunings) : Set to tune_params::AUTOPREFETCHER_WEAK. From-SVN: r254879 --- gcc/ChangeLog | 7 +++++++ gcc/config/aarch64/aarch64.c | 4 ++-- 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a7954d2dbc3..38101fa3550 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2017-11-17 Luis Machado + + * config/aarch64/aarch64.c + (qdf24xx_prefetch_tune) : Set to -1. + (qdf24xx_tunings) : Set to + tune_params::AUTOPREFETCHER_WEAK. + 2017-11-17 Tamar Christina PR target/82641 diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 0c67e2b5c67..8779cad91d9 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -508,7 +508,7 @@ static const cpu_prefetch_tune qdf24xx_prefetch_tune = 32, /* l1_cache_size */ 64, /* l1_cache_line_size */ 1024, /* l2_cache_size */ - 3 /* default_opt_level */ + -1 /* default_opt_level */ }; static const cpu_prefetch_tune thunderxt88_prefetch_tune = @@ -817,7 +817,7 @@ static const struct tune_params qdf24xx_tunings = 2, /* min_div_recip_mul_sf. */ 2, /* min_div_recip_mul_df. */ 0, /* max_case_values. */ - tune_params::AUTOPREFETCHER_STRONG, /* autoprefetcher_model. */ + tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */ (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */ &qdf24xx_prefetch_tune }; -- 2.30.2