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From: Wilco Dijkstra Sent: 05 April 2017 13:38 To: GCC Patches Cc: nd; James Greenhalgh; andrew.pin...@cavium.com; Evandro Menezes; jim.wil...@linaro.org Subject: [PATCH][AArch64] Enable AUTOPREFETCHER_WEAK with -mcpu=generic Many supported cores use the AUTOPREFETCHER_WEAK setting which tries to order loads and stores to improve streaming performance. Since significant gains were reported in http://patchwork.ozlabs.org/patch/534469/ it seems like a good idea to enable this setting too for -mcpu=generic. Since the weak model only keeps the order if it doesn't make the schedule worse, it should not impact performance adversely on cores that don't show a gain. Any objections? ChangeLog: 2017-04-05 Wilco Dijkstra <wdijk...@arm.com> * gcc/config/aarch64/aarch64.c (generic_tunings): Update prefetch model. -- diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index 8b729b1b1f87316e940d7fc657f235a935ffa93e..b249ce2b310707c7ded2827d505ce2ddfcfbf976 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -547,7 +547,7 @@ static const struct tune_params generic_tunings = 2, /* min_div_recip_mul_df. */ 0, /* max_case_values. */ 0, /* cache_line_size. */ - tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */ + tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */ (AARCH64_EXTRA_TUNE_NONE) /* tune_flags. */ };
