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From: Wilco Dijkstra <wilco@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] AArch64: Improve strchrnul Date: Tue, 17 Jan 2023 16:35:56 +0000 (GMT) [thread overview] Message-ID: <20230117163556.BB152385842A@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=09ebd8549b2ce5a3a6c0c7c5f3e62227faf50a99 commit 09ebd8549b2ce5a3a6c0c7c5f3e62227faf50a99 Author: Wilco Dijkstra <wilco.dijkstra@arm.com> Date: Wed Jan 11 13:52:23 2023 +0000 AArch64: Improve strchrnul Unroll the main loop, which improves performance slightly. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Diff: --- sysdeps/aarch64/strchrnul.S | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/sysdeps/aarch64/strchrnul.S b/sysdeps/aarch64/strchrnul.S index 4ca1e58c36..aa8c9a4363 100644 --- a/sysdeps/aarch64/strchrnul.S +++ b/sysdeps/aarch64/strchrnul.S @@ -70,14 +70,22 @@ ENTRY (__strchrnul) .p2align 4 L(loop): - ldr qdata, [src, 16]! + ldr qdata, [src, 16] + cmeq vhas_chr.16b, vdata.16b, vrepchr.16b + cmhs vhas_chr.16b, vhas_chr.16b, vdata.16b + umaxp vend.16b, vhas_chr.16b, vhas_chr.16b + fmov tmp1, dend + cbnz tmp1, L(end) + ldr qdata, [src, 32]! cmeq vhas_chr.16b, vdata.16b, vrepchr.16b cmhs vhas_chr.16b, vhas_chr.16b, vdata.16b umaxp vend.16b, vhas_chr.16b, vhas_chr.16b fmov tmp1, dend cbz tmp1, L(loop) - + sub src, src, 16 +L(end): shrn vend.8b, vhas_chr.8h, 4 /* 128->64 */ + add src, src, 16 fmov tmp1, dend #ifndef __AARCH64EB__ rbit tmp1, tmp1
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