[thirdparty/glibc.git] / sysdeps / powerpc / powerpc64 / power8 / strcasestr.S

/* Optimized strcasestr implementation for PowerPC64/POWER8.
   Copyright (C) 2016-2017 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 <sysdep.h>
#include <locale-defines.h>

/* Char * [r3] strcasestr (char *s [r3], char * pat[r4])  */

/* The performance gain is obtained by comparing 16 bytes.  */

/* When the first char of r4 is hit ITERATIONS times in r3
   fallback to default.  */
#define ITERATIONS	64

#ifndef STRLEN
/* For builds without IFUNC support, local calls should be made to internal
   GLIBC symbol (created by libc_hidden_builtin_def).  */
# ifdef SHARED
#  define STRLEN   __GI_strlen
# else
#  define STRLEN   strlen
# endif
#endif

#ifndef STRNLEN
/* For builds without IFUNC support, local calls should be made to internal
   GLIBC symbol (created by libc_hidden_builtin_def).  */
# ifdef SHARED
#  define STRNLEN   __GI_strnlen
# else
#  define STRNLEN    __strnlen
# endif
#endif

#ifndef STRCHR
# ifdef SHARED
#  define STRCHR   __GI_strchr
# else
#  define STRCHR   strchr
# endif
#endif

/* Convert 16 bytes of v4 and reg to lowercase and compare.  */
#define TOLOWER(reg)     \
	vcmpgtub	v6, v4, v1; \
	vcmpgtub	v7, v2, v4; \
	vand	v8, v7, v6; \
	vand	v8, v8, v3; \
	vor	v4, v8, v4; \
	vcmpgtub	v6, reg, v1; \
	vcmpgtub	v7, v2, reg; \
	vand	v8, v7, v6; \
	vand	v8, v8, v3; \
	vor	reg, v8, reg; \
	vcmpequb.	v6, reg, v4;

/* TODO: change these to the actual instructions when the minimum required
   binutils allows it.  */
#ifdef _ARCH_PWR8
#define VCLZD_V8_v7	vclzd	v8, v7;
#else
#define VCLZD_V8_v7	.long	0x11003fc2
#endif

#define	FRAMESIZE	(FRAME_MIN_SIZE+48)
/* TODO: change this to .machine power8 when the minimum required binutils
   allows it.  */
	.machine  power7
EALIGN (__strcasestr, 4, 0)
	CALL_MCOUNT 2
	mflr	r0			/* Load link register LR to r0.  */
	std	r31, -8(r1)		/* Save callers register r31.  */
	std	r30, -16(r1)		/* Save callers register r30.  */
	std	r29, -24(r1)		/* Save callers register r29.  */
	std	r28, -32(r1)		/* Save callers register r28.  */
	std	r27, -40(r1)		/* Save callers register r27.  */
	std	r0, 16(r1)		/* Store the link register.  */
	cfi_offset(r31, -8)
	cfi_offset(r30, -16)
	cfi_offset(r29, -24)
	cfi_offset(r28, -32)
	cfi_offset(r27, -40)
	cfi_offset(lr, 16)
	stdu	r1, -FRAMESIZE(r1)	/* Create the stack frame.  */
	cfi_adjust_cfa_offset(FRAMESIZE)

	dcbt	0, r3
	dcbt	0, r4
	cmpdi	cr7, r3, 0		/* Input validation.  */
	beq	cr7, L(retnull)
	cmpdi	cr7, r4, 0
	beq	cr7, L(retnull)

	mr	r29, r3
	mr	r30, r4
	/* Load first byte from r4 and check if its null.  */
	lbz	r6, 0(r4)
	cmpdi	cr7, r6, 0
	beq	cr7, L(ret_r3)

	ld	r10, __libc_tsd_LOCALE@got@tprel(r2)
	add	r9, r10, __libc_tsd_LOCALE@tls
	ld	r9, 0(r9)
	ld	r9, LOCALE_CTYPE_TOUPPER(r9)
	sldi	r10, r6, 2		/* Convert to upper case.  */
	lwzx	r28, r9, r10

	ld	r10, __libc_tsd_LOCALE@got@tprel(r2)
	add	r11, r10, __libc_tsd_LOCALE@tls
	ld	r11, 0(r11)
	ld	r11, LOCALE_CTYPE_TOLOWER(r11)
	sldi	r10, r6, 2              /* Convert to lower case.  */
	lwzx	r27, r11, r10

	/* Check if the first char is present.  */
	mr	r4, r27
	bl	STRCHR
	nop
	mr	r5, r3
	mr	r3, r29
	mr	r29, r5
	mr	r4, r28
	bl	STRCHR
	nop
	cmpdi	cr7, r29, 0
	beq	cr7, L(firstpos)
	cmpdi	cr7, r3, 0
	beq	cr7, L(skipcheck)
	cmpw	cr7, r3, r29
	ble 	cr7, L(firstpos)
	/* Move r3 to the first occurence.  */
L(skipcheck):
	mr	r3, r29
L(firstpos):
	mr	r29, r3

	sldi	r9, r27, 8
	or	r28, r9, r28
	/* Reg r27 is used to count the number of iterations.  */
	li	r27, 0
	/* If first char of search str is not present.  */
	cmpdi	cr7, r3, 0
	ble	cr7, L(end)

	/* Find the length of pattern.  */
	mr	r3, r30
	bl	STRLEN
	nop

	cmpdi	cr7, r3, 0	/* If search str is null.  */
	beq	cr7, L(ret_r3)

	mr	r31, r3
	mr	r4, r3
	mr	r3, r29
	bl	STRNLEN
	nop

	cmpd	cr7, r3, r31 	/* If len(r3) < len(r4).  */
	blt	cr7, L(retnull)

	mr	r3, r29

	/* Locales not matching ASCII for single bytes.  */
	ld	r10, __libc_tsd_LOCALE@got@tprel(r2)
	add	r9, r10, __libc_tsd_LOCALE@tls
	ld	r9, 0(r9)
	ld	r7, 0(r9)
	addi	r7, r7, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES
	lwz	r8, 0(r7)
	cmpdi	cr7, r8, 1
	beq	cr7, L(bytebybyte)

	/* If len(r4) < 16 handle byte by byte.  */
	/* For shorter strings we will not use vector registers.  */
	cmpdi	cr7, r31, 16
	blt	cr7, L(bytebybyte)

	/* Comparison values used for TOLOWER.  */
	/* Load v1 = 64('A' - 1), v2 = 91('Z' + 1), v3 = 32 in each byte.  */
	vspltish	v0, 0
	vspltisb	v5, 2
	vspltisb	v4, 4
	vsl	v3, v5, v4
	vaddubm	v1, v3, v3
	vspltisb	v5, 15
	vaddubm	v2, v5, v5
	vaddubm	v2, v1, v2
	vspltisb	v4, -3
	vaddubm	v2, v2, v4

	/*
	1. Load 16 bytes from r3 and r4
	2. Check if there is null, If yes, proceed byte by byte path.
	3. Else,Convert both to lowercase and compare.
	4. If they are same proceed to 1.
	5. If they dont match, find if first char of r4 is present in the
	   loaded 16 byte of r3.
	6. If yes, move position, load next 16 bytes of r3 and proceed to 2.
	*/

	mr	r8, r3		/* Save r3 for future use.  */
	mr	r4, r30		/* Restore r4.  */
	clrldi	r10, r4, 60
	lvx	v5, 0, r4	/* Load 16 bytes from r4.  */
	cmpdi	cr7, r10, 0
	beq	cr7, L(begin2)
	/* If r4 is unaligned, load another 16 bytes.  */
#ifdef __LITTLE_ENDIAN__
	lvsr	v7, 0, r4
#else
	lvsl	v7, 0, r4
#endif
	addi	r5, r4, 16
	lvx	v9, 0, r5
#ifdef __LITTLE_ENDIAN__
	vperm	v5, v9, v5, v7
#else
	vperm	v5, v5, v9, v7
#endif
L(begin2):
	lvx	v4, 0, r3
	vcmpequb.	v7, v0, v4	/* Check for null.  */
	beq	cr6, L(nullchk6)
	b	L(trailcheck)

        .align  4
L(nullchk6):
	clrldi	r10, r3, 60
	cmpdi	cr7, r10, 0
	beq	cr7, L(next16)
#ifdef __LITTLE_ENDIAN__
	lvsr	v7, 0, r3
#else
	lvsl	v7, 0, r3
#endif
	addi	r5, r3, 16
	/* If r3 is unaligned, load another 16 bytes.  */
	lvx	v10, 0, r5
#ifdef __LITTLE_ENDIAN__
	vperm	v4, v10, v4, v7
#else
	vperm	v4, v4, v10, v7
#endif
L(next16):
	vcmpequb.	v6, v0, v5	/* Check for null.  */
	beq	cr6, L(nullchk)
	b	L(trailcheck)

	.align	4
L(nullchk):
	vcmpequb.	v6, v0, v4
	beq	cr6, L(nullchk1)
	b	L(retnull)

	.align	4
L(nullchk1):
	/* Convert both v3 and v4 to lower.  */
	TOLOWER(v5)
	/* If both are same, branch to match.  */
	blt	cr6, L(match)
	/* Find if the first char is present in next 15 bytes.  */
#ifdef __LITTLE_ENDIAN__
	vspltb	v6, v5, 15
	vsldoi	v7, v0, v4, 15
#else
	vspltb	v6, v5, 0
	vspltisb	v7, 8
	vslo	v7, v4, v7
#endif
	vcmpequb	v7, v6, v7
	vcmpequb.	v6, v0, v7
	/* Shift r3 by 16 bytes and proceed.  */
	blt	cr6, L(shift16)
	VCLZD_V8_v7
#ifdef __LITTLE_ENDIAN__
	vspltb	v6, v8, 15
#else
	vspltb	v6, v8, 7
#endif
	vcmpequb.	v6, v6, v1
	/* Shift r3 by 8  bytes and proceed.  */
	blt	cr6, L(shift8)
	b	L(begin)

	.align	4
L(match):
	/* There is a match of 16 bytes, check next bytes.  */
	cmpdi	cr7, r31, 16
	mr	r29, r3
	beq	cr7, L(ret_r3)

L(secondmatch):
	addi	r3, r3, 16
	addi	r4, r4, 16
	/* Load next 16 bytes of r3 and r4 and compare.  */
	clrldi	r10, r4, 60
	cmpdi	cr7, r10, 0
	beq	cr7, L(nextload)
	/* Handle unaligned case.  */
	vor	v6, v9, v9
	vcmpequb.	v7, v0, v6
	beq	cr6, L(nullchk2)
	b	L(trailcheck)

	.align	4
L(nullchk2):
#ifdef __LITTLE_ENDIAN__
	lvsr	v7, 0, r4
#else
	lvsl	v7, 0, r4
#endif
	addi	r5, r4, 16
	/* If r4 is unaligned, load another 16 bytes.  */
	lvx	v9, 0, r5
#ifdef __LITTLE_ENDIAN__
	vperm	v11, v9, v6, v7
#else
	vperm	v11, v6, v9, v7
#endif
	b	L(compare)

	.align	4
L(nextload):
	lvx	v11, 0, r4
L(compare):
	vcmpequb.	v7, v0, v11
	beq	cr6, L(nullchk3)
	b	L(trailcheck)

	.align	4
L(nullchk3):
	clrldi	r10, r3, 60
	cmpdi 	cr7, r10, 0
	beq 	cr7, L(nextload1)
	/* Handle unaligned case.  */
	vor	v4, v10, v10
	vcmpequb.	v7, v0, v4
	beq	cr6, L(nullchk4)
	b	L(retnull)

	.align	4
L(nullchk4):
#ifdef __LITTLE_ENDIAN__
	lvsr	v7, 0, r3
#else
	lvsl	v7, 0, r3
#endif
	addi	r5, r3, 16
	/* If r3 is unaligned, load another 16 bytes.  */
	lvx	v10, 0, r5
#ifdef __LITTLE_ENDIAN__
	vperm	v4, v10, v4, v7
#else
	vperm	v4, v4, v10, v7
#endif
	b	L(compare1)

	.align	4
L(nextload1):
	lvx	v4, 0, r3
L(compare1):
	vcmpequb.	v7, v0, v4
	beq	cr6, L(nullchk5)
	b	L(retnull)

	.align	4
L(nullchk5):
	/* Convert both v3 and v4 to lower.  */
	TOLOWER(v11)
	/* If both are same, branch to secondmatch.  */
	blt 	cr6, L(secondmatch)
	/* Continue the search.  */
        b	L(begin)

	.align	4
L(trailcheck):
	ld	r10, __libc_tsd_LOCALE@got@tprel(r2)
	add	r11, r10, __libc_tsd_LOCALE@tls
	ld	r11, 0(r11)
	ld	r11, LOCALE_CTYPE_TOLOWER(r11)
L(loop2):
	lbz	r5, 0(r3)               /* Load byte from r3.  */
	lbz	r6, 0(r4)               /* Load next byte from r4.  */
	cmpdi 	cr7, r6, 0              /* Is it null?  */
	beq 	cr7, L(updater3)
	cmpdi 	cr7, r5, 0              /* Is it null?  */
	beq 	cr7, L(retnull)         /* If yes, return.  */
	addi	r3, r3, 1
	addi	r4, r4, 1               /* Increment r4.  */
	sldi	r10, r5, 2              /* Convert to lower case.  */
	lwzx	r10, r11, r10
	sldi	r7, r6, 2               /* Convert to lower case.  */
	lwzx	r7, r11, r7
	cmpw	cr7, r7, r10            /* Compare with byte from r4.  */
	bne	cr7, L(begin)
	b	L(loop2)

	.align	4
L(shift8):
	addi	r8, r8, 7
	b	L(begin)
	.align	4
L(shift16):
	addi	r8, r8, 15
	.align	4
L(begin):
	addi	r8, r8, 1
	mr	r3, r8
	/* When our iterations exceed ITERATIONS,fall back to default.  */
	addi	r27, r27, 1
	cmpdi	cr7, r27, ITERATIONS
	beq	cr7, L(default)
	mr	r4, r30         /* Restore r4.  */
	b	L(begin2)

	/* Handling byte by byte.  */
	.align	4
L(loop1):
	mr	r3, r8
	addi	r27, r27, 1
	cmpdi	cr7, r27, ITERATIONS
	beq	cr7, L(default)
	mr	r29, r8
	srdi	r4, r28, 8
	/* Check if the first char is present.  */
	bl	STRCHR
	nop
	mr	r5, r3
	mr	r3, r29
	mr	r29, r5
	sldi	r4, r28, 56
	srdi	r4, r4, 56
	bl	STRCHR
	nop
	cmpdi	cr7, r29, 0
	beq	cr7, L(nextpos)
	cmpdi	cr7, r3, 0
	beq	cr7, L(skipcheck1)
	cmpw	cr7, r3, r29
	ble 	cr7, L(nextpos)
	/* Move r3 to first occurence.  */
L(skipcheck1):
	mr	r3, r29
L(nextpos):
	mr	r29, r3
	cmpdi 	cr7, r3, 0
	ble 	cr7, L(retnull)
L(bytebybyte):
	ld	r10, __libc_tsd_LOCALE@got@tprel(r2)
	add	r11, r10, __libc_tsd_LOCALE@tls
	ld	r11, 0(r11)
	ld	r11, LOCALE_CTYPE_TOLOWER(r11)
	mr	r4, r30                 /* Restore r4.  */
	mr	r8, r3                  /* Save r3.  */
	addi	r8, r8, 1

L(loop):
	addi	r3, r3, 1
	lbz	r5, 0(r3)               /* Load byte from r3.  */
	addi	r4, r4, 1               /* Increment r4.  */
	lbz	r6, 0(r4)               /* Load next byte from r4.  */
	cmpdi 	cr7, r6, 0              /* Is it null?  */
	beq 	cr7, L(updater3)
	cmpdi 	cr7, r5, 0              /* Is it null?  */
	beq 	cr7, L(retnull)         /* If yes, return.  */
	sldi	r10, r5, 2              /* Convert to lower case.  */
	lwzx	r10, r11, r10
	sldi	r7, r6, 2               /* Convert to lower case.  */
	lwzx	r7, r11, r7
	cmpw	cr7, r7, r10            /* Compare with byte from r4.  */
	bne 	cr7, L(loop1)
	b	L(loop)

	/* Handling return values.  */
	.align	4
L(updater3):
	subf	r3, r31, r3	/* Reduce r31 (len of r4) from r3.  */
	b	L(end)

	.align	4
L(ret_r3):
	mr	r3, r29		/* Return point of match.  */
	b	L(end)

	.align	4
L(retnull):
	li	r3, 0		/* Substring was not found.  */
	b	L(end)

	.align	4
L(default):
	mr	r4, r30
	bl	__strcasestr_ppc
	nop

	.align	4
L(end):
	addi	r1, r1, FRAMESIZE	/* Restore stack pointer.  */
	cfi_adjust_cfa_offset(-FRAMESIZE)
	ld	r0, 16(r1)	/* Restore the saved link register.  */
	ld	r27, -40(r1)
	ld	r28, -32(r1)
	ld	r29, -24(r1)	/* Restore callers save register r29.  */
	ld	r30, -16(r1)	/* Restore callers save register r30.  */
	ld	r31, -8(r1)	/* Restore callers save register r31.  */
	cfi_restore(lr)
	cfi_restore(r27)
	cfi_restore(r28)
	cfi_restore(r29)
	cfi_restore(r30)
	cfi_restore(r31)
	mtlr	r0		/* Branch to link register.  */
	blr
END (__strcasestr)

weak_alias (__strcasestr, strcasestr)
libc_hidden_def (__strcasestr)
libc_hidden_builtin_def (strcasestr)
Commit	Line	Data
e413b14e	1	/* Optimized strcasestr implementation for PowerPC64/POWER8.
bfff8b1b	2	Copyright (C) 2016-2017 Free Software Foundation, Inc.
e413b14e RS	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	#include <sysdep.h>
	20	#include <locale-defines.h>
	21
	22	/* Char * [r3] strcasestr (char s [r3], char pat[r4]) */
	23
	24	/* The performance gain is obtained by comparing 16 bytes. */
	25
	26	/* When the first char of r4 is hit ITERATIONS times in r3
	27	fallback to default. */
	28	#define ITERATIONS 64
	29
	30	#ifndef STRLEN
	31	/* For builds without IFUNC support, local calls should be made to internal
	32	GLIBC symbol (created by libc_hidden_builtin_def). */
	33	# ifdef SHARED
	34	# define STRLEN __GI_strlen
	35	# else
	36	# define STRLEN strlen
	37	# endif
	38	#endif
	39
	40	#ifndef STRNLEN
	41	/* For builds without IFUNC support, local calls should be made to internal
	42	GLIBC symbol (created by libc_hidden_builtin_def). */
	43	# ifdef SHARED
	44	# define STRNLEN __GI_strnlen
	45	# else
	46	# define STRNLEN __strnlen
	47	# endif
	48	#endif
	49
	50	#ifndef STRCHR
	51	# ifdef SHARED
	52	# define STRCHR __GI_strchr
	53	# else
	54	# define STRCHR strchr
	55	# endif
	56	#endif
	57
	58	/* Convert 16 bytes of v4 and reg to lowercase and compare. */
	59	#define TOLOWER(reg) \
	60	vcmpgtub v6, v4, v1; \
	61	vcmpgtub v7, v2, v4; \
	62	vand v8, v7, v6; \
	63	vand v8, v8, v3; \
	64	vor v4, v8, v4; \
	65	vcmpgtub v6, reg, v1; \
	66	vcmpgtub v7, v2, reg; \
67	vand v8, v7, v6; \
68	vand v8, v8, v3; \
69	vor reg, v8, reg; \
70	vcmpequb. v6, reg, v4;
71
72	/* TODO: change these to the actual instructions when the minimum required
73	binutils allows it. */
74	#ifdef _ARCH_PWR8
75	#define VCLZD_V8_v7 vclzd v8, v7;
76	#else
77	#define VCLZD_V8_v7 .long 0x11003fc2
78	#endif
79
80	#define FRAMESIZE (FRAME_MIN_SIZE+48)
81	/* TODO: change this to .machine power8 when the minimum required binutils
82	allows it. */
83	.machine power7
c24480ce	84	EALIGN (__strcasestr, 4, 0)
e413b14e RS	85	CALL_MCOUNT 2
	86	mflr r0 /* Load link register LR to r0. */
	87	std r31, -8(r1) /* Save callers register r31. */
	88	std r30, -16(r1) /* Save callers register r30. */
	89	std r29, -24(r1) /* Save callers register r29. */
	90	std r28, -32(r1) /* Save callers register r28. */
	91	std r27, -40(r1) /* Save callers register r27. */
	92	std r0, 16(r1) /* Store the link register. */
	93	cfi_offset(r31, -8)
	94	cfi_offset(r30, -16)
	95	cfi_offset(r29, -24)
	96	cfi_offset(r28, -32)
	97	cfi_offset(r27, -40)
	98	cfi_offset(lr, 16)
	99	stdu r1, -FRAMESIZE(r1) /* Create the stack frame. */
	100	cfi_adjust_cfa_offset(FRAMESIZE)
	101
	102	dcbt 0, r3
	103	dcbt 0, r4
	104	cmpdi cr7, r3, 0 /* Input validation. */
	105	beq cr7, L(retnull)
	106	cmpdi cr7, r4, 0
	107	beq cr7, L(retnull)
	108
	109	mr r29, r3
	110	mr r30, r4
	111	/* Load first byte from r4 and check if its null. */
	112	lbz r6, 0(r4)
	113	cmpdi cr7, r6, 0
	114	beq cr7, L(ret_r3)
	115
	116	ld r10, __libc_tsd_LOCALE@got@tprel(r2)
	117	add r9, r10, __libc_tsd_LOCALE@tls
	118	ld r9, 0(r9)
	119	ld r9, LOCALE_CTYPE_TOUPPER(r9)
	120	sldi r10, r6, 2 /* Convert to upper case. */
	121	lwzx r28, r9, r10
	122
	123	ld r10, __libc_tsd_LOCALE@got@tprel(r2)
	124	add r11, r10, __libc_tsd_LOCALE@tls
	125	ld r11, 0(r11)
	126	ld r11, LOCALE_CTYPE_TOLOWER(r11)
	127	sldi r10, r6, 2 /* Convert to lower case. */
	128	lwzx r27, r11, r10
	129
	130	/* Check if the first char is present. */
	131	mr r4, r27
	132	bl STRCHR
	133	nop
	134	mr r5, r3
	135	mr r3, r29
	136	mr r29, r5
	137	mr r4, r28
	138	bl STRCHR
	139	nop
	140	cmpdi cr7, r29, 0
	141	beq cr7, L(firstpos)
	142	cmpdi cr7, r3, 0
	143	beq cr7, L(skipcheck)
	144	cmpw cr7, r3, r29
	145	ble cr7, L(firstpos)
	146	/* Move r3 to the first occurence. */
	147	L(skipcheck):
	148	mr r3, r29
149	L(firstpos):
150	mr r29, r3
151
152	sldi r9, r27, 8
153	or r28, r9, r28
154	/* Reg r27 is used to count the number of iterations. */
155	li r27, 0
156	/* If first char of search str is not present. */
157	cmpdi cr7, r3, 0
158	ble cr7, L(end)
159
160	/* Find the length of pattern. */
161	mr r3, r30
162	bl STRLEN
163	nop
164
165	cmpdi cr7, r3, 0 /* If search str is null. */
166	beq cr7, L(ret_r3)
167
168	mr r31, r3
169	mr r4, r3
170	mr r3, r29
171	bl STRNLEN
172	nop
173
174	cmpd cr7, r3, r31 /* If len(r3) < len(r4). */
175	blt cr7, L(retnull)
176
177	mr r3, r29
178
179	/* Locales not matching ASCII for single bytes. */
180	ld r10, __libc_tsd_LOCALE@got@tprel(r2)
181	add r9, r10, __libc_tsd_LOCALE@tls
182	ld r9, 0(r9)
183	ld r7, 0(r9)
184	addi r7, r7, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES
185	lwz r8, 0(r7)
186	cmpdi cr7, r8, 1
187	beq cr7, L(bytebybyte)
188
189	/* If len(r4) < 16 handle byte by byte. */
190	/* For shorter strings we will not use vector registers. */
191	cmpdi cr7, r31, 16
192	blt cr7, L(bytebybyte)
193
194	/* Comparison values used for TOLOWER. */
195	/* Load v1 = 64('A' - 1), v2 = 91('Z' + 1), v3 = 32 in each byte. */
196	vspltish v0, 0
197	vspltisb v5, 2
198	vspltisb v4, 4
199	vsl v3, v5, v4
200	vaddubm v1, v3, v3
201	vspltisb v5, 15
202	vaddubm v2, v5, v5
203	vaddubm v2, v1, v2
204	vspltisb v4, -3
205	vaddubm v2, v2, v4
206
207	/*
208	1. Load 16 bytes from r3 and r4
209	2. Check if there is null, If yes, proceed byte by byte path.
210	3. Else,Convert both to lowercase and compare.
211	4. If they are same proceed to 1.
212	5. If they dont match, find if first char of r4 is present in the
213	loaded 16 byte of r3.
214	6. If yes, move position, load next 16 bytes of r3 and proceed to 2.
215	*/
216
217	mr r8, r3 /* Save r3 for future use. */
218	mr r4, r30 /* Restore r4. */
219	clrldi r10, r4, 60
220	lvx v5, 0, r4 /* Load 16 bytes from r4. */
221	cmpdi cr7, r10, 0
222	beq cr7, L(begin2)
223	/* If r4 is unaligned, load another 16 bytes. */
224	#ifdef __LITTLE_ENDIAN__
225	lvsr v7, 0, r4
226	#else
227	lvsl v7, 0, r4
228	#endif
229	addi r5, r4, 16
230	lvx v9, 0, r5
231	#ifdef __LITTLE_ENDIAN__
232	vperm v5, v9, v5, v7
233	#else
234	vperm v5, v5, v9, v7
235	#endif
236	L(begin2):
237	lvx v4, 0, r3
238	vcmpequb. v7, v0, v4 /* Check for null. */
239	beq cr6, L(nullchk6)
240	b L(trailcheck)
241
242	.align 4
243	L(nullchk6):
244	clrldi r10, r3, 60
245	cmpdi cr7, r10, 0
246	beq cr7, L(next16)
247	#ifdef __LITTLE_ENDIAN__
248	lvsr v7, 0, r3
249	#else
250	lvsl v7, 0, r3
251	#endif
252	addi r5, r3, 16
253	/* If r3 is unaligned, load another 16 bytes. */
254	lvx v10, 0, r5
255	#ifdef __LITTLE_ENDIAN__
256	vperm v4, v10, v4, v7
257	#else
258	vperm v4, v4, v10, v7
259	#endif
260	L(next16):
261	vcmpequb. v6, v0, v5 /* Check for null. */
262	beq cr6, L(nullchk)
263	b L(trailcheck)
264
265	.align 4
266	L(nullchk):
267	vcmpequb. v6, v0, v4
268	beq cr6, L(nullchk1)
269	b L(retnull)
270
271	.align 4
272	L(nullchk1):
273	/* Convert both v3 and v4 to lower. */
274	TOLOWER(v5)
275	/* If both are same, branch to match. */
276	blt cr6, L(match)
277	/* Find if the first char is present in next 15 bytes. */
278	#ifdef __LITTLE_ENDIAN__
279	vspltb v6, v5, 15
280	vsldoi v7, v0, v4, 15
281	#else
282	vspltb v6, v5, 0
283	vspltisb v7, 8
284	vslo v7, v4, v7
285	#endif
286	vcmpequb v7, v6, v7
287	vcmpequb. v6, v0, v7
288	/* Shift r3 by 16 bytes and proceed. */
289	blt cr6, L(shift16)
290	VCLZD_V8_v7
291	#ifdef __LITTLE_ENDIAN__
292	vspltb v6, v8, 15
293	#else
294	vspltb v6, v8, 7
295	#endif
296	vcmpequb. v6, v6, v1
297	/* Shift r3 by 8 bytes and proceed. */
298	blt cr6, L(shift8)
299	b L(begin)
300
301	.align 4
302	L(match):
303	/* There is a match of 16 bytes, check next bytes. */
304	cmpdi cr7, r31, 16
305	mr r29, r3
306	beq cr7, L(ret_r3)
307
308	L(secondmatch):
309	addi r3, r3, 16
310	addi r4, r4, 16
311	/* Load next 16 bytes of r3 and r4 and compare. */
312	clrldi r10, r4, 60
313	cmpdi cr7, r10, 0
314	beq cr7, L(nextload)
315	/* Handle unaligned case. */
316	vor v6, v9, v9
317	vcmpequb. v7, v0, v6
318	beq cr6, L(nullchk2)
319	b L(trailcheck)
320
321	.align 4
322	L(nullchk2):
323	#ifdef __LITTLE_ENDIAN__
324	lvsr v7, 0, r4
325	#else
326	lvsl v7, 0, r4
327	#endif
328	addi r5, r4, 16
329	/* If r4 is unaligned, load another 16 bytes. */
330	lvx v9, 0, r5
331	#ifdef __LITTLE_ENDIAN__
332	vperm v11, v9, v6, v7
333	#else
334	vperm v11, v6, v9, v7
335	#endif
336	b L(compare)
337
338	.align 4
339	L(nextload):
340	lvx v11, 0, r4
341	L(compare):
342	vcmpequb. v7, v0, v11
343	beq cr6, L(nullchk3)
344	b L(trailcheck)
345
346	.align 4
347	L(nullchk3):
348	clrldi r10, r3, 60
349	cmpdi cr7, r10, 0
350	beq cr7, L(nextload1)
351	/* Handle unaligned case. */
352	vor v4, v10, v10
353	vcmpequb. v7, v0, v4
354	beq cr6, L(nullchk4)
355	b L(retnull)
356
357	.align 4
358	L(nullchk4):
359	#ifdef __LITTLE_ENDIAN__
360	lvsr v7, 0, r3
361	#else
362	lvsl v7, 0, r3
363	#endif
364	addi r5, r3, 16
365	/* If r3 is unaligned, load another 16 bytes. */
366	lvx v10, 0, r5
367	#ifdef __LITTLE_ENDIAN__
368	vperm v4, v10, v4, v7
369	#else
370	vperm v4, v4, v10, v7
371	#endif
372	b L(compare1)
373
374	.align 4
375	L(nextload1):
376	lvx v4, 0, r3
377	L(compare1):
378	vcmpequb. v7, v0, v4
379	beq cr6, L(nullchk5)
380	b L(retnull)
381
382	.align 4
383	L(nullchk5):
384	/* Convert both v3 and v4 to lower. */
385	TOLOWER(v11)
386	/* If both are same, branch to secondmatch. */
387	blt cr6, L(secondmatch)
388	/* Continue the search. */
389	b L(begin)
390
391	.align 4
392	L(trailcheck):
393	ld r10, __libc_tsd_LOCALE@got@tprel(r2)
394	add r11, r10, __libc_tsd_LOCALE@tls
395	ld r11, 0(r11)
396	ld r11, LOCALE_CTYPE_TOLOWER(r11)
397	L(loop2):
398	lbz r5, 0(r3) /* Load byte from r3. */
399	lbz r6, 0(r4) /* Load next byte from r4. */
400	cmpdi cr7, r6, 0 /* Is it null? */
401	beq cr7, L(updater3)
402	cmpdi cr7, r5, 0 /* Is it null? */
403	beq cr7, L(retnull) /* If yes, return. */
404	addi r3, r3, 1
405	addi r4, r4, 1 /* Increment r4. */
406	sldi r10, r5, 2 /* Convert to lower case. */
407	lwzx r10, r11, r10
408	sldi r7, r6, 2 /* Convert to lower case. */
409	lwzx r7, r11, r7
410	cmpw cr7, r7, r10 /* Compare with byte from r4. */
411	bne cr7, L(begin)
412	b L(loop2)
413
414	.align 4
415	L(shift8):
416	addi r8, r8, 7
417	b L(begin)
418	.align 4
419	L(shift16):
420	addi r8, r8, 15
421	.align 4
422	L(begin):
423	addi r8, r8, 1
424	mr r3, r8
425	/* When our iterations exceed ITERATIONS,fall back to default. */
426	addi r27, r27, 1
427	cmpdi cr7, r27, ITERATIONS
428	beq cr7, L(default)
429	mr r4, r30 /* Restore r4. */
430	b L(begin2)
431
432	/* Handling byte by byte. */
433	.align 4
434	L(loop1):
435	mr r3, r8
436	addi r27, r27, 1
437	cmpdi cr7, r27, ITERATIONS
438	beq cr7, L(default)
439	mr r29, r8
440	srdi r4, r28, 8
441	/* Check if the first char is present. */
442	bl STRCHR
443	nop
444	mr r5, r3
445	mr r3, r29
446	mr r29, r5
447	sldi r4, r28, 56
448	srdi r4, r4, 56
449	bl STRCHR
450	nop
451	cmpdi cr7, r29, 0
452	beq cr7, L(nextpos)
453	cmpdi cr7, r3, 0
454	beq cr7, L(skipcheck1)
455	cmpw cr7, r3, r29
456	ble cr7, L(nextpos)
457	/* Move r3 to first occurence. */
458	L(skipcheck1):
459	mr r3, r29
460	L(nextpos):
461	mr r29, r3
462	cmpdi cr7, r3, 0
463	ble cr7, L(retnull)
464	L(bytebybyte):
465	ld r10, __libc_tsd_LOCALE@got@tprel(r2)
466	add r11, r10, __libc_tsd_LOCALE@tls
467	ld r11, 0(r11)
468	ld r11, LOCALE_CTYPE_TOLOWER(r11)
469	mr r4, r30 /* Restore r4. */
470	mr r8, r3 /* Save r3. */
471	addi r8, r8, 1
472
473	L(loop):
474	addi r3, r3, 1
475	lbz r5, 0(r3) /* Load byte from r3. */
476	addi r4, r4, 1 /* Increment r4. */
477	lbz r6, 0(r4) /* Load next byte from r4. */
478	cmpdi cr7, r6, 0 /* Is it null? */
479	beq cr7, L(updater3)
480	cmpdi cr7, r5, 0 /* Is it null? */
481	beq cr7, L(retnull) /* If yes, return. */
482	sldi r10, r5, 2 /* Convert to lower case. */
483	lwzx r10, r11, r10
484	sldi r7, r6, 2 /* Convert to lower case. */
485	lwzx r7, r11, r7
486	cmpw cr7, r7, r10 /* Compare with byte from r4. */
487	bne cr7, L(loop1)
488	b L(loop)
489
490	/* Handling return values. */
491	.align 4
492	L(updater3):
493	subf r3, r31, r3 /* Reduce r31 (len of r4) from r3. */
494	b L(end)
495
496	.align 4
497	L(ret_r3):
498	mr r3, r29 /* Return point of match. */
499	b L(end)
500
501	.align 4
502	L(retnull):
503	li r3, 0 /* Substring was not found. */
504	b L(end)
505
506	.align 4
507	L(default):
508	mr r4, r30
509	bl __strcasestr_ppc
510	nop
511
512	.align 4
513	L(end):
514	addi r1, r1, FRAMESIZE /* Restore stack pointer. */
515	cfi_adjust_cfa_offset(-FRAMESIZE)
516	ld r0, 16(r1) /* Restore the saved link register. */
517	ld r27, -40(r1)
518	ld r28, -32(r1)
519	ld r29, -24(r1) /* Restore callers save register r29. */
520	ld r30, -16(r1) /* Restore callers save register r30. */
521	ld r31, -8(r1) /* Restore callers save register r31. */
522	cfi_restore(lr)
523	cfi_restore(r27)
524	cfi_restore(r28)
525	cfi_restore(r29)
526	cfi_restore(r30)
527	cfi_restore(r31)
528	mtlr r0 /* Branch to link register. */
529	blr
c24480ce TMQMF	530	END (__strcasestr)
	531
	532	weak_alias (__strcasestr, strcasestr)
	533	libc_hidden_def (__strcasestr)
e413b14e	534	libc_hidden_builtin_def (strcasestr)