/* 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) */