Lines Matching +full:sub +full:- +full:systems

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  * Copyright (c) 2013-2021, Arm Limited.
6  * https://github.com/ARM-software/optimized-routines/blob/98e4d6a5c13c8e54/string/aarch64/strlen.S
11 #include <asm/mte-def.h>
15  * ARMv8-a, AArch64, unaligned accesses, min page size 4k.
36 	/* NUL detection works on the principle that (X - 1) & (~X) & 0x80
37 	   (=> (X - 1) & ~(X | 0x7f)) is non-zero iff a byte is zero, and
39 	   (X - 1) & 0x80 is zero for non-NUL ASCII characters, but gives
48  * (16-byte) granularity, and we must ensure that no access straddles this
60 	   byte we calculate the length from the 2 8-byte words using
66 	   using the fast NUL check.  If we encounter non-ASCII characters,
75 	   AArch64 systems have a minimum page size of 4k.  We don't bother
76 	   checking for larger page sizes - the cost of setting up the correct
83 	and	tmp1, srcin, MIN_PAGE_SIZE - 1
85 	cmp	tmp1, MIN_PAGE_SIZE - 16
89 	/* For big-endian, carry propagation (if the final byte in the
91 	   Since we expect strings to be small and early-exit,
92 	   byte-swap the data now so has_null1/2 will be correct.  */
96 	sub	tmp1, data1, zeroones
98 	sub	tmp3, data2, zeroones
115 	   NUL check.  If we encounter non-ASCII characters, use a second
120 	sub	src, src, 16
124 	sub	tmp1, data1, zeroones
125 	sub	tmp3, data2, zeroones
130 	sub	tmp1, data1, zeroones
131 	sub	tmp3, data2, zeroones
148 	/* For big-endian, carry propagation (if the final byte in the
150 	   easiest way to get the correct byte is to byte-swap the data
154 	sub	tmp1, data1, zeroones
160 	sub	len, src, srcin
170 	sub	tmp1, data1, zeroones
172 	sub	tmp3, data2, zeroones
179 	sub	tmp1, data1, zeroones
181 	sub	tmp3, data2, zeroones
196 	mov	tmp4, -1
198 	/* Big-endian.	Early bytes are at MSB.	 */
201 	/* Little-endian.  Early bytes are at LSB.  */