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AArch64: Improve strchrnul

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Unroll the main loop, which improves performance slightly.

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
This commit is contained in:
Wilco Dijkstra 2023-01-11 13:52:23 +00:00
parent 51541a2297
commit 09ebd8549b
1 changed files with 10 additions and 2 deletions
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12
sysdeps/aarch64/strchrnul.S
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@ -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