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From: Wilco Dijkstra <wilco@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r12-1015] AArch64: Enable fast shifts on Neoverse N1 Date: Mon, 24 May 2021 14:01:02 +0000 (GMT) [thread overview] Message-ID: <20210524140102.C8023385802D@sourceware.org> (raw) https://gcc.gnu.org/g:b326f495218a213079f572bd9960903b3425da74 commit r12-1015-gb326f495218a213079f572bd9960903b3425da74 Author: Wilco Dijkstra <wdijkstr@arm.com> Date: Mon May 24 14:31:37 2021 +0100 AArch64: Enable fast shifts on Neoverse N1 Enable the fast shift feature in Neoverse N1 tuning - this means additions with a shift left by 1-4 are as fast as addition. This improves multiply by constant expansions, eg. x * 25 is now emitted using shifts rather than a multiply: add w0, w0, w0, lsl 2 add w0, w0, w0, lsl 2 ChangeLog: 2020-09-11 Wilco Dijkstra <wdijkstr@arm.com> * config/aarch64/aarch64.c (neoversen1_tunings): Enable AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND. Diff: --- gcc/config/aarch64/aarch64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index e9f961d41fa..2753c852abd 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -1659,7 +1659,7 @@ static const struct tune_params neoversen1_tunings = 2, /* min_div_recip_mul_df. */ 0, /* max_case_values. */ tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */ - (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */ + (AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */ &generic_prefetch_tune };
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