newlib-cygwin/newlib/libc/machine/aarch64/strnlen.S

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/*
* strnlen - calculate the length of a string with limit.
*
* Copyright (c) 2020-2022, Arm Limited.
* SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
*/
#if (defined (__OPTIMIZE_SIZE__) || defined (PREFER_SIZE_OVER_SPEED))
/* See strlen-stub.c */
#else
/* Assumptions:
*
* ARMv8-a, AArch64, Advanced SIMD.
* MTE compatible.
*/
#include "asmdefs.h"
#define srcin x0
#define cntin x1
#define result x0
#define src x2
#define synd x3
#define shift x4
#define tmp x4
#define cntrem x5
#define qdata q0
#define vdata v0
#define vhas_chr v1
#define vend v2
#define dend d2
/*
Core algorithm:
Process the string in 16-byte aligned chunks. Compute a 64-bit mask with
four bits per byte using the shrn instruction. A count trailing zeros then
identifies the first zero byte. */
ENTRY (strnlen)
PTR_ARG (0)
SIZE_ARG (1)
bic src, srcin, 15
cbz cntin, L(nomatch)
ld1 {vdata.16b}, [src]
cmeq vhas_chr.16b, vdata.16b, 0
lsl shift, srcin, 2
shrn vend.8b, vhas_chr.8h, 4 /* 128->64 */
fmov synd, dend
lsr synd, synd, shift
cbz synd, L(start_loop)
L(finish):
rbit synd, synd
clz synd, synd
lsr result, synd, 2
cmp cntin, result
csel result, cntin, result, ls
ret
L(nomatch):
mov result, cntin
ret
L(start_loop):
sub tmp, src, srcin
add tmp, tmp, 17
subs cntrem, cntin, tmp
b.lo L(nomatch)
/* Make sure that it won't overread by a 16-byte chunk */
tbz cntrem, 4, L(loop32_2)
sub src, src, 16
.p2align 5
L(loop32):
ldr qdata, [src, 32]!
cmeq vhas_chr.16b, vdata.16b, 0
umaxp vend.16b, vhas_chr.16b, vhas_chr.16b /* 128->64 */
fmov synd, dend
cbnz synd, L(end)
L(loop32_2):
ldr qdata, [src, 16]
subs cntrem, cntrem, 32
cmeq vhas_chr.16b, vdata.16b, 0
b.lo L(end_2)
umaxp vend.16b, vhas_chr.16b, vhas_chr.16b /* 128->64 */
fmov synd, dend
cbz synd, L(loop32)
L(end_2):
add src, src, 16
L(end):
shrn vend.8b, vhas_chr.8h, 4 /* 128->64 */
sub result, src, srcin
fmov synd, dend
#ifndef __AARCH64EB__
rbit synd, synd
#endif
clz synd, synd
add result, result, synd, lsr 2
cmp cntin, result
csel result, cntin, result, ls
ret
END (strnlen)
#endif