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| author | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2023-01-11 13:52:23 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2024-04-09 19:10:56 +0100 |
| commit | bb36cb21ef589ec1199b9382a94c1960af0aa90a (patch) | |
| tree | 8a3b8d43efbc53a6dc2a062ed3dda5378cafd21d | |
| parent | 196458764fad98ef7cba120b2d871646def7c89f (diff) | |
| download | glibc-bb36cb21ef589ec1199b9382a94c1960af0aa90a.tar.gz glibc-bb36cb21ef589ec1199b9382a94c1960af0aa90a.tar.xz glibc-bb36cb21ef589ec1199b9382a94c1960af0aa90a.zip | |
AArch64: Improve strchrnul
Unroll the main loop, which improves performance slightly. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com> (cherry picked from commit 09ebd8549b2ce5a3a6c0c7c5f3e62227faf50a99)
| -rw-r--r-- | sysdeps/aarch64/strchrnul.S | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/sysdeps/aarch64/strchrnul.S b/sysdeps/aarch64/strchrnul.S index 3a29eb7692..c3817f45db 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 |