/* Vector optimized 32/64 bit S/390 version of strchr.

   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/>.  */

#include <ifunc-strchr.h>

#if HAVE_STRCHR_Z13

# include "sysdep.h"

# include "asm-syntax.h"

	.text

/* char *strchr (const char *s, int c)

   Locate character in string.

   Register usage:

   -r1=tmp

   -r2=s

   -r3=c

   -r4=tmp

   -r5=current_len

   -v16=part of s

   -v17=index of unequal

   -v18=replicated c

*/

ENTRY(STRCHR_Z13)

	.machine "z13"

	.machinemode "zarch_nohighgprs"

	vlbb	%v16,0(%r2),6	/* Load s until next 4k-byte boundary.  */

	lcbb	%r1,0(%r2),6	/* Get bytes to 4k-byte boundary or 16.  */

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

	vlvgb	%v18,%r3,0	/* Generate vector which elements are all c.

				   If c > 255, c will be truncated.  */

	vrepb	%v18,%v18,0

	vfeezbs	%v16,%v16,%v18	/* Find element equal with zero search.  */

	vlgvb	%r4,%v16,7	/* Load byte index of character or zero.  */

	clrjl	%r4,%r1,.Lfound /* Return if c/zero is in loaded bytes.  */

	/* Align s to 16 byte.  */

	risbgn	%r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */

	lghi	%r5,16		/* current_len = 16.  */

	slr	%r5,%r4		/* Compute bytes to 16bytes boundary.  */

	/* Find c/zero in 16 byte aligned loop */

.Lloop:

	vl	%v16,0(%r5,%r2) /* Load s.  */

	vfeezbs	%v16,%v16,%v18	/* Find element equal with zero search.  */

	jno	.Lfound		/* Found c/zero (cc=0|1|2).  */

	vl	%v16,16(%r5,%r2)

	vfeezbs	%v16,%v16,%v18

	jno	.Lfound16

	vl	%v16,32(%r5,%r2)

	vfeezbs	%v16,%v16,%v18

	jno	.Lfound32

	vl	%v16,48(%r5,%r2)

	vfeezbs	%v16,%v16,%v18

	jno	.Lfound48

	aghi	%r5,64

	j	.Lloop		/* No character and no zero -> loop.  */

.Lfound48:

	la	%r5,16(%r5)	/* Use la since aghi would clobber cc.  */

.Lfound32:

	la	%r5,16(%r5)

.Lfound16:

	la	%r5,16(%r5)

.Lfound:

	je	.Lzero		/* Found zero, but no c before that zero.  */

.Lcharacter:

	vlgvb	%r4,%v16,7	/* Load byte index of character.  */

	algr	%r5,%r4

	la	%r2,0(%r5,%r2)	/* Return pointer to character.  */

	br	%r14

.Lzero:

	llgcr	%r3,%r3		/* char c_char = (char) c.  */

	clije	%r3,0,.Lcharacter /* Found zero and c is zero.  */

	lghi	%r2,0		/* Return null if character not found.  */

	br	%r14

END(STRCHR_Z13)

# if ! HAVE_STRCHR_IFUNC

strong_alias (STRCHR_Z13, strchr)

weak_alias (strchr, index)

# endif

# if ! HAVE_STRCHR_C && defined SHARED && IS_IN (libc)

strong_alias (STRCHR_Z13, __GI_strchr)

# endif

#endif /* HAVE_STRCHR_Z13  */