#define tmp x2
#define tmpw w2
#define synd x3
+#define syndw w3
#define shift x4
/* For the first 32 bytes, NUL detection works on the principle that
ENTRY (__strlen_asimd)
PTR_ARG (0)
-
and tmp1, srcin, MIN_PAGE_SIZE - 1
cmp tmp1, MIN_PAGE_SIZE - 32
b.hi L(page_cross)
add len, len, tmp1, lsr 3
ret
- .p2align 3
/* Look for a NUL byte at offset 16..31 in the string. */
L(bytes16_31):
ldp data1, data2, [srcin, 16]
add len, len, tmp1, lsr 3
ret
+ nop
L(loop_entry):
bic src, srcin, 31
/* Low 32 bits of synd are non-zero if a NUL was found in datav1. */
cmeq maskv.16b, datav1.16b, 0
sub len, src, srcin
- tst synd, 0xffffffff
- b.ne 1f
+ cbnz syndw, 1f
cmeq maskv.16b, datav2.16b, 0
add len, len, 16
1:
/* Generate a bitmask and compute correct byte offset. */
-#ifdef __AARCH64EB__
- bic maskv.8h, 0xf0
-#else
- bic maskv.8h, 0x0f, lsl 8
-#endif
- umaxp maskv.16b, maskv.16b, maskv.16b
+ shrn maskv.8b, maskv.8h, 4
fmov synd, maskd
#ifndef __AARCH64EB__
rbit synd, synd
add len, len, tmp, lsr 2
ret
- .p2align 4
-
L(page_cross):
bic src, srcin, 31
mov tmpw, 0x0c03