[newlib-cygwin.git] / newlib / libc / machine / arc / strcmp-archs.S

/*
   Copyright (c) 2015-2024, Synopsys, Inc. All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:

   1) Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

   2) Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

   3) Neither the name of the Synopsys, Inc., nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGE.
*/

/* This implementation is optimized for performance.  For code size a generic
   implementation of this function from newlib/libc/string/strcmp.c will be
   used.  */
#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) \
    && !defined (__ARC_RF16__)

#include "asm.h"

#ifdef __ARCHS__
ENTRY (strcmp)
	or	r2, r0, r1
	bmsk_s	r2, r2, 1
	brne	r2, 0, @.Lcharloop

; s1 and s2 are word aligned
	ld.ab	r2, [r0, 4]

	mov_s	r12, 0x01010101
	ror	r11, r12
	.align  4
.LwordLoop:
	ld.ab	r3, [r1, 4]
	; Detect NULL char in str1
	sub	r4, r2, r12
	ld.ab	r5, [r0, 4]
	bic	r4, r4, r2
	and	r4, r4, r11
	brne.d.nt	r4, 0, .LfoundNULL
	; Check if the read locations are the same
	cmp	r2, r3
	beq.d	.LwordLoop
	mov.eq	r2, r5

	; A match is found, spot it out
#ifdef __LITTLE_ENDIAN__
	swape	r3, r3
	mov_s	r0, 1
	swape	r2, r2
#else
	mov_s	r0, 1
#endif
	cmp_s	r2, r3
	j_s.d	[blink]
	bset.lo	r0, r0, 31

	.align 4
.LfoundNULL:
#ifdef __BIG_ENDIAN__
	swape	r4, r4
	swape	r2, r2
	swape	r3, r3
#endif
	; Find null byte
	ffs	r0, r4
	bmsk	r2, r2, r0
	bmsk	r3, r3, r0
	swape	r2, r2
	swape	r3, r3
	; make the return value
	sub.f	r0, r2, r3
	mov.hi	r0, 1
	j_s.d	[blink]
	bset.lo	r0, r0, 31

	.align 4
.Lcharloop:
	ldb.ab	r2, [r0, 1]
	ldb.ab	r3, [r1, 1]
	nop
	breq	r2, 0, .Lcmpend
	breq	r2, r3, .Lcharloop

	.align 4
.Lcmpend:
	j_s.d	[blink]
	sub	r0, r2, r3
ENDFUNC (strcmp)
#endif /* __ARCHS__ */

#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */
Commit	Line	Data
c0a99f02	1	/*
d85bb55f	2	Copyright (c) 2015-2024, Synopsys, Inc. All rights reserved.
c0a99f02 AK	3
	4	Redistribution and use in source and binary forms, with or without
	5	modification, are permitted provided that the following conditions are met:
	6
	7	1) Redistributions of source code must retain the above copyright notice,
	8	this list of conditions and the following disclaimer.
	9
	10	2) Redistributions in binary form must reproduce the above copyright notice,
	11	this list of conditions and the following disclaimer in the documentation
	12	and/or other materials provided with the distribution.
	13
	14	3) Neither the name of the Synopsys, Inc., nor the names of its contributors
	15	may be used to endorse or promote products derived from this software
	16	without specific prior written permission.
	17
	18	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	19	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	20	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	21	ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	22	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	23	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	24	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	25	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	26	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	27	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	28	POSSIBILITY OF SUCH DAMAGE.
	29	*/
	30
	31	/* This implementation is optimized for performance. For code size a generic
	32	implementation of this function from newlib/libc/string/strcmp.c will be
	33	used. */
d85bb55f CZ	34	#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) \
d85bb55f CZ	35	&& !defined (__ARC_RF16__)
c0a99f02 AK	36
	37	#include "asm.h"
	38
06537f05	39	#ifdef __ARCHS__
c0a99f02 AK	40	ENTRY (strcmp)
	41	or r2, r0, r1
	42	bmsk_s r2, r2, 1
	43	brne r2, 0, @.Lcharloop
	44
	45	; s1 and s2 are word aligned
	46	ld.ab r2, [r0, 4]
	47
	48	mov_s r12, 0x01010101
	49	ror r11, r12
	50	.align 4
	51	.LwordLoop:
	52	ld.ab r3, [r1, 4]
	53	; Detect NULL char in str1
	54	sub r4, r2, r12
	55	ld.ab r5, [r0, 4]
	56	bic r4, r4, r2
	57	and r4, r4, r11
	58	brne.d.nt r4, 0, .LfoundNULL
	59	; Check if the read locations are the same
	60	cmp r2, r3
	61	beq.d .LwordLoop
	62	mov.eq r2, r5
	63
	64	; A match is found, spot it out
	65	#ifdef __LITTLE_ENDIAN__
	66	swape r3, r3
	67	mov_s r0, 1
	68	swape r2, r2
	69	#else
	70	mov_s r0, 1
	71	#endif
	72	cmp_s r2, r3
	73	j_s.d [blink]
	74	bset.lo r0, r0, 31
	75
	76	.align 4
	77	.LfoundNULL:
	78	#ifdef __BIG_ENDIAN__
	79	swape r4, r4
	80	swape r2, r2
	81	swape r3, r3
	82	#endif
	83	; Find null byte
	84	ffs r0, r4
	85	bmsk r2, r2, r0
	86	bmsk r3, r3, r0
	87	swape r2, r2
	88	swape r3, r3
	89	; make the return value
	90	sub.f r0, r2, r3
	91	mov.hi r0, 1
	92	j_s.d [blink]
	93	bset.lo r0, r0, 31
	94
	95	.align 4
	96	.Lcharloop:
	97	ldb.ab r2, [r0, 1]
	98	ldb.ab r3, [r1, 1]
	99	nop
	100	breq r2, 0, .Lcmpend
	101	breq r2, r3, .Lcharloop
	102
	103	.align 4
104	.Lcmpend:
105	j_s.d [blink]
106	sub r0, r2, r3
107	ENDFUNC (strcmp)
06537f05	108	#endif /* __ARCHS__ */
c0a99f02 AK	109
c0a99f02 AK	110	#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */