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From: Fangrui Song <maskray@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/maskray/unnest] Revert "AArch64: Update A64FX memset not to degrade at 16KB" Date: Thu, 23 Sep 2021 00:43:43 +0000 (GMT) [thread overview] Message-ID: <20210923004343.1E75B385843E@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f873adf3df443f8d302677f963adcc3c22187e68 commit f873adf3df443f8d302677f963adcc3c22187e68 Author: Szabolcs Nagy <szabolcs.nagy@arm.com> Date: Mon Sep 6 10:21:07 2021 +0100 Revert "AArch64: Update A64FX memset not to degrade at 16KB" Because of wrong commit author. Will recommit it with right author. This reverts commit 23777232c23f80809613bdfa329f63aadf992922. Diff: --- sysdeps/aarch64/multiarch/memset_a64fx.S | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/sysdeps/aarch64/multiarch/memset_a64fx.S b/sysdeps/aarch64/multiarch/memset_a64fx.S index f7dfdaace7..7bf759b6a7 100644 --- a/sysdeps/aarch64/multiarch/memset_a64fx.S +++ b/sysdeps/aarch64/multiarch/memset_a64fx.S @@ -96,14 +96,7 @@ L(vl_agnostic): // VL Agnostic L(unroll8): sub count, count, tmp1 .p2align 4 - // The 2 instructions at the beginning of the following loop, - // cmp and branch, are a workaround so as not to degrade at - // the peak performance 16KB. - // It is found heuristically and the branch condition, b.ne, - // is chosen intentionally never to jump. -1: cmp xzr, xzr - b.ne 1b - st1b_unroll 0, 7 +1: st1b_unroll 0, 7 add dst, dst, tmp1 subs count, count, tmp1 b.hi 1b
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