[thirdparty/glibc.git] / sysdeps / s390 / multiarch / wcscmp-vx.S

/* Vector optimized 32/64 bit S/390 version of wcscmp.
   Copyright (C) 2015-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)

# include "sysdep.h"
# include "asm-syntax.h"

	.text

/* int wcscmp (const wchar_t *s1, const wchar_t *s2)
   Compare two strings

   Register usage:
   -r1=loaded byte count s1
   -r2=s1
   -r3=s2
   -r4=loaded byte coutn s2, tmp
   -r5=current_len
   -v16=part of s1
   -v17=part of s2
   -v18=index of unequal
*/
ENTRY(__wcscmp_vx)
	.machine "z13"
	.machinemode "zarch_nohighgprs"

	lghi	%r5,0		/* current_len = 0.  */

.Lloop:
	vlbb	%v16,0(%r5,%r2),6 /* Load s1 to block boundary.  */
	vlbb	%v17,0(%r5,%r3),6 /* Load s2 to block boundary.  */
	lcbb	%r1,0(%r5,%r2),6 /* Get loaded byte count of s1.  */
	jo	.Llt16_1	/* Jump away if vr is not fully loaded.  */
	lcbb	%r4,0(%r5,%r3),6
	jo	.Llt16_2	/* Jump away if vr is not fully loaded.  */
	/* Both vrs are fully loaded.  */
	aghi	%r5,16
	vfenezfs %v18,%v16,%v17	/* Compare not equal with zero search.  */
	jno	.Lfound

	vlbb	%v16,0(%r5,%r2),6
	vlbb	%v17,0(%r5,%r3),6
	lcbb	%r1,0(%r5,%r2),6
	jo	.Llt16_1
	lcbb	%r4,0(%r5,%r3),6
	jo	.Llt16_2
	aghi	%r5,16
	vfenezfs %v18,%v16,%v17
	jno	.Lfound

	vlbb	%v16,0(%r5,%r2),6
	vlbb	%v17,0(%r5,%r3),6
	lcbb	%r1,0(%r5,%r2),6
	jo	.Llt16_1
	lcbb	%r4,0(%r5,%r3),6
	jo	.Llt16_2
	aghi	%r5,16
	vfenezfs %v18,%v16,%v17
	jno	.Lfound

	vlbb	%v16,0(%r5,%r2),6
	vlbb	%v17,0(%r5,%r3),6
	lcbb	%r1,0(%r5,%r2),6
	jo	.Llt16_1
	lcbb	%r4,0(%r5,%r3),6
	jo	.Llt16_2
	aghi	%r5,16
	vfenezfs %v18,%v16,%v17
	jno	.Lfound
	j	.Lloop

.Lcmp_one_char:
	/* At least one of both strings is not 4-byte aligned
	   and there is no full character before next block-boundary.
	   Compare one character to get over the boundary and
	   proceed with normal loop!  */
	vlef	%v16,0(%r5,%r2),0 /* Load one character.  */
	vlef	%v17,0(%r5,%r3),0
	lghi	%r1,4		/* Loaded byte count is 4.  */
	j	.Llt_cmp	/* Proceed with comparision.  */

.Llt16_1:
	lcbb	%r4,0(%r5,%r3),6 /* Get loaded byte count of s2.  */
.Llt16_2:
	clr	%r1,%r4
	locrh	%r1,%r4		/* Get minimum of bytes loaded in s1/2.  */
	nill	%r1,65532	/* Align bytes loaded to full characters.  */
	jz	.Lcmp_one_char	/* Jump away if no full char is available.  */
.Llt_cmp:
	algfr	%r5,%r1		/* Add smallest loaded bytes to current_len.  */
	vfenezfs %v18,%v16,%v17	/* Compare not equal with zero search.  */
	vlgvb	%r4,%v18,7	/* Get not equal index or 16 if all equal.  */
	clrjl	%r4,%r1,.Lfound /* Jump away if miscompare is within loaded
				    bytes.  */
	j	.Lloop

.Lfound:
	/* vfenezf found an unequal element or zero.
	   This instruction compares unsigned words, but wchar_t is signed.
	   Thus we have to compare the found element again.  */
	vlgvb	%r4,%v18,7	/* Extract not equal byte-index,  */
	srl	%r4,2		/* Convert it to character-index.  */
	vlgvf	%r3,%v16,0(%r4)	/* Load character-values.  */
	vlgvf	%r4,%v17,0(%r4)
	cr	%r3,%r4
	je	.Lend_equal
	lghi	%r2,1
	lghi	%r1,-1
	locgrl	%r2,%r1
	br	%r14
.Lend_equal:
	lghi	%r2,0
	br	%r14
END(__wcscmp_vx)
#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */
Commit	Line	Data
63724a6d	1	/* Vector optimized 32/64 bit S/390 version of wcscmp.
688903eb	2	Copyright (C) 2015-2018 Free Software Foundation, Inc.
63724a6d SL	3	This file is part of the GNU C Library.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with the GNU C Library; if not, see
	17	<http://www.gnu.org/licenses/>. */
	18
	19	#if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc)
	20
	21	# include "sysdep.h"
	22	# include "asm-syntax.h"
	23
	24	.text
	25
	26	/* int wcscmp (const wchar_t s1, const wchar_t s2)
	27	Compare two strings
	28
	29	Register usage:
	30	-r1=loaded byte count s1
	31	-r2=s1
	32	-r3=s2
	33	-r4=loaded byte coutn s2, tmp
	34	-r5=current_len
	35	-v16=part of s1
	36	-v17=part of s2
	37	-v18=index of unequal
	38	*/
	39	ENTRY(__wcscmp_vx)
	40	.machine "z13"
	41	.machinemode "zarch_nohighgprs"
	42
	43	lghi %r5,0 /* current_len = 0. */
	44
	45	.Lloop:
	46	vlbb %v16,0(%r5,%r2),6 /* Load s1 to block boundary. */
	47	vlbb %v17,0(%r5,%r3),6 /* Load s2 to block boundary. */
	48	lcbb %r1,0(%r5,%r2),6 /* Get loaded byte count of s1. */
	49	jo .Llt16_1 /* Jump away if vr is not fully loaded. */
	50	lcbb %r4,0(%r5,%r3),6
	51	jo .Llt16_2 /* Jump away if vr is not fully loaded. */
	52	/* Both vrs are fully loaded. */
	53	aghi %r5,16
	54	vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */
	55	jno .Lfound
	56
	57	vlbb %v16,0(%r5,%r2),6
	58	vlbb %v17,0(%r5,%r3),6
	59	lcbb %r1,0(%r5,%r2),6
	60	jo .Llt16_1
	61	lcbb %r4,0(%r5,%r3),6
	62	jo .Llt16_2
	63	aghi %r5,16
	64	vfenezfs %v18,%v16,%v17
	65	jno .Lfound
	66
67	vlbb %v16,0(%r5,%r2),6
68	vlbb %v17,0(%r5,%r3),6
69	lcbb %r1,0(%r5,%r2),6
70	jo .Llt16_1
71	lcbb %r4,0(%r5,%r3),6
72	jo .Llt16_2
73	aghi %r5,16
74	vfenezfs %v18,%v16,%v17
75	jno .Lfound
76
77	vlbb %v16,0(%r5,%r2),6
78	vlbb %v17,0(%r5,%r3),6
79	lcbb %r1,0(%r5,%r2),6
80	jo .Llt16_1
81	lcbb %r4,0(%r5,%r3),6
82	jo .Llt16_2
83	aghi %r5,16
84	vfenezfs %v18,%v16,%v17
85	jno .Lfound
86	j .Lloop
87
88	.Lcmp_one_char:
89	/* At least one of both strings is not 4-byte aligned
90	and there is no full character before next block-boundary.
91	Compare one character to get over the boundary and
92	proceed with normal loop! */
93	vlef %v16,0(%r5,%r2),0 /* Load one character. */
94	vlef %v17,0(%r5,%r3),0
95	lghi %r1,4 /* Loaded byte count is 4. */
96	j .Llt_cmp /* Proceed with comparision. */
97
98	.Llt16_1:
99	lcbb %r4,0(%r5,%r3),6 /* Get loaded byte count of s2. */
100	.Llt16_2:
101	clr %r1,%r4
102	locrh %r1,%r4 /* Get minimum of bytes loaded in s1/2. */
103	nill %r1,65532 /* Align bytes loaded to full characters. */
104	jz .Lcmp_one_char /* Jump away if no full char is available. */
105	.Llt_cmp:
106	algfr %r5,%r1 /* Add smallest loaded bytes to current_len. */
107	vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */
108	vlgvb %r4,%v18,7 /* Get not equal index or 16 if all equal. */
109	clrjl %r4,%r1,.Lfound /* Jump away if miscompare is within loaded
110	bytes. */
111	j .Lloop
112
113	.Lfound:
114	/* vfenezf found an unequal element or zero.
115	This instruction compares unsigned words, but wchar_t is signed.
116	Thus we have to compare the found element again. */
117	vlgvb %r4,%v18,7 /* Extract not equal byte-index, */
118	srl %r4,2 /* Convert it to character-index. */
119	vlgvf %r3,%v16,0(%r4) /* Load character-values. */
120	vlgvf %r4,%v17,0(%r4)
121	cr %r3,%r4
122	je .Lend_equal
123	lghi %r2,1
124	lghi %r1,-1
125	locgrl %r2,%r1
126	br %r14
127	.Lend_equal:
128	lghi %r2,0
129	br %r14
130	END(__wcscmp_vx)
131	#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */