glibc/glibc-RHEL-60466-2.patch

commit 92fdb11ae7aa1ab6b18622670ea702205cd6fdc5
Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Date:   Tue Feb 28 14:23:59 2023 -0300

    powerpc: Remove powerpc64 strncmp variants
    
    The default, and power7 implementation just adds word aligned
    access when inputs have the same aligment.  The unaligned case
    is still done by byte operations.
    
    This is already covered by the generic implementation, which also add
    the unaligned input optimization.
    
    Checked on powerpc64-linux-gnu built without multi-arch for powerpc64,
    power7, power8, and power9 (build for le).
    Reviewed-by: Rajalakshmi Srinivasaraghavan <rajis@linux.ibm.com>

Conflicts:
	sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S
	sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S
	sysdeps/powerpc/powerpc64/power7/strncmp.S
	sysdeps/powerpc/powerpc64/strncmp.S
	  (copyright year changes upstream)

diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index 5b20dab108de14ab..0ee7ce39d6470d80 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -12,7 +12,7 @@ sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \
 		   strnlen-power8 strnlen-power7 strnlen-ppc64 \
 		   strcasecmp-power7 strcasecmp_l-power7 \
 		   strncase-power7 strncase_l-power7 \
-		   strncmp-power8 strncmp-power7 strncmp-ppc64 \
+		   strncmp-power8 strncmp-ppc64 \
 		   strchr-power8 strchr-power7 strchr-ppc64 \
 		   strchrnul-power8 strchrnul-power7 strchrnul-ppc64 \
 		   strcpy-power8 strcpy-power7 strcpy-ppc64 stpcpy-power8 \
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
index 914e7d5e28a98b5d..2c84d287ee76a7ea 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -175,8 +175,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 #endif
 	      IFUNC_IMPL_ADD (array, i, strncmp, hwcap2 & PPC_FEATURE2_ARCH_2_07,
 			      __strncmp_power8)
-	      IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_FEATURE_ARCH_2_06,
-			      __strncmp_power7)
 	      IFUNC_IMPL_ADD (array, i, strncmp, 1,
 			      __strncmp_ppc))
 
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S b/sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S
deleted file mode 100644
index 8282ff076c9e00ce..0000000000000000
--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp-power7.S
+++ /dev/null
@@ -1,23 +0,0 @@
-/* Copyright (C) 2013-2021 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
-   <https://www.gnu.org/licenses/>.  */
-
-#define STRNCMP __strncmp_power7
-
-#undef libc_hidden_builtin_def
-#define libc_hidden_builtin_def(name)
-
-#include <sysdeps/powerpc/powerpc64/power7/strncmp.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S b/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S
deleted file mode 100644
index c6f325650c9ace3b..0000000000000000
--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.S
+++ /dev/null
@@ -1,26 +0,0 @@
-/* Copyright (C) 2013-2021 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
-   <https://www.gnu.org/licenses/>.  */
-
-#if defined SHARED && IS_IN (libc)
-# define STRNCMP __strncmp_ppc
-
-# undef libc_hidden_builtin_def
-# define libc_hidden_builtin_def(name)				\
-    .globl __GI_strncmp; __GI_strncmp = __strncmp_ppc
-#endif
-
-#include <sysdeps/powerpc/powerpc64/strncmp.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.c b/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.c
new file mode 100644
index 0000000000000000..09cc009a913ed169
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strncmp-ppc64.c
@@ -0,0 +1,7 @@
+#if defined SHARED && IS_IN (libc)
+# define STRNCMP __strncmp_ppc
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name) \
+    __hidden_ver1 (__strncmp_ppc, __GI_strncmp, __strncmp_ppc);
+#endif
+#include <string/strncmp.c>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c
index 275a558e4afa7d61..df2c0707a919ad79 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c
@@ -26,7 +26,6 @@
 # include "init-arch.h"
 
 extern __typeof (strncmp) __strncmp_ppc attribute_hidden;
-extern __typeof (strncmp) __strncmp_power7 attribute_hidden;
 extern __typeof (strncmp) __strncmp_power8 attribute_hidden;
 # ifdef __LITTLE_ENDIAN__
 extern __typeof (strncmp) __strncmp_power9 attribute_hidden;
@@ -43,7 +42,5 @@ libc_ifunc_redirected (__redirect_strncmp, strncmp,
 # endif
 		       (hwcap2 & PPC_FEATURE2_ARCH_2_07)
 		       ? __strncmp_power8
-		       : (hwcap & PPC_FEATURE_ARCH_2_06)
-			 ? __strncmp_power7
-			 : __strncmp_ppc);
+		       : __strncmp_ppc);
 #endif
diff --git a/sysdeps/powerpc/powerpc64/power7/strncmp.S b/sysdeps/powerpc/powerpc64/power7/strncmp.S
deleted file mode 100644
index d91aeb6077a558f2..0000000000000000
--- a/sysdeps/powerpc/powerpc64/power7/strncmp.S
+++ /dev/null
@@ -1,228 +0,0 @@
-/* Optimized strcmp implementation for POWER7/PowerPC64.
-   Copyright (C) 2010-2021 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
-   <https://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-
-#ifndef STRNCMP
-# define STRNCMP strncmp
-#endif
-
-/* See strlen.s for comments on how the end-of-string testing works.  */
-
-/* int [r3] strncmp (const char *s1 [r3],
-		     const char *s2 [r4],
-		     size_t size [r5])  */
-
-	.machine power7
-ENTRY_TOCLESS (STRNCMP, 5)
-	CALL_MCOUNT 3
-
-#define rTMP2	r0
-#define rRTN	r3
-#define rSTR1	r3	/* first string arg */
-#define rSTR2	r4	/* second string arg */
-#define rN	r5	/* max string length */
-#define rWORD1	r6	/* current word in s1 */
-#define rWORD2	r7	/* current word in s2 */
-#define rWORD3  r10
-#define rWORD4  r11
-#define rFEFE	r8	/* constant 0xfefefefefefefeff (-0x0101010101010101) */
-#define r7F7F	r9	/* constant 0x7f7f7f7f7f7f7f7f */
-#define rNEG	r10	/* ~(word in s1 | 0x7f7f7f7f7f7f7f7f) */
-#define rBITDIF	r11	/* bits that differ in s1 & s2 words */
-#define rTMP	r12
-
-	dcbt	0,rSTR1
-	nop
-	or	rTMP,rSTR2,rSTR1
-	lis	r7F7F,0x7f7f
-	dcbt	0,rSTR2
-	nop
-	clrldi.	rTMP,rTMP,61
-	cmpldi	cr1,rN,0
-	lis	rFEFE,-0x101
-	bne	L(unaligned)
-/* We are doubleword aligned so set up for two loops.  first a double word
-   loop, then fall into the byte loop if any residual.  */
-	srdi.	rTMP,rN,3
-	clrldi	rN,rN,61
-	addi	rFEFE,rFEFE,-0x101
-	addi	r7F7F,r7F7F,0x7f7f
-	cmpldi	cr1,rN,0
-	beq	L(unaligned)
-
-	mtctr	rTMP
-	ld	rWORD1,0(rSTR1)
-	ld	rWORD2,0(rSTR2)
-	sldi	rTMP,rFEFE,32
-	insrdi	r7F7F,r7F7F,32,0
-	add	rFEFE,rFEFE,rTMP
-	b	L(g1)
-
-L(g0):
-	ldu	rWORD1,8(rSTR1)
-	bne	cr1,L(different)
-	ldu	rWORD2,8(rSTR2)
-L(g1):	add	rTMP,rFEFE,rWORD1
-	nor	rNEG,r7F7F,rWORD1
-	bdz	L(tail)
-	and.	rTMP,rTMP,rNEG
-	cmpd	cr1,rWORD1,rWORD2
-	beq	L(g0)
-
-/* OK. We've hit the end of the string. We need to be careful that
-   we don't compare two strings as different because of gunk beyond
-   the end of the strings...  */
-
-#ifdef __LITTLE_ENDIAN__
-L(endstring):
-	addi    rTMP2, rTMP, -1
-	beq	cr1, L(equal)
-	andc    rTMP2, rTMP2, rTMP
-	rldimi	rTMP2, rTMP2, 1, 0
-	and	rWORD2, rWORD2, rTMP2	/* Mask off gunk.  */
-	and	rWORD1, rWORD1, rTMP2
-	cmpd	cr1, rWORD1, rWORD2
-	beq	cr1, L(equal)
-	cmpb	rBITDIF, rWORD1, rWORD2	/* 0xff on equal bytes.  */
-	addi	rNEG, rBITDIF, 1
-	orc	rNEG, rNEG, rBITDIF	/* 0's below LS differing byte.  */
-	sldi	rNEG, rNEG, 8		/* 1's above LS differing byte.  */
-	andc	rWORD1, rWORD1, rNEG	/* mask off MS bytes.  */
-	andc	rWORD2, rWORD2, rNEG
-	xor.	rBITDIF, rWORD1, rWORD2
-	sub	rRTN, rWORD1, rWORD2
-	blt	L(highbit)
-	sradi	rRTN, rRTN, 63		/* must return an int.  */
-	ori	rRTN, rRTN, 1
-	blr
-L(equal):
-	li	rRTN, 0
-	blr
-
-L(different):
-	ld	rWORD1, -8(rSTR1)
-	cmpb	rBITDIF, rWORD1, rWORD2	/* 0xff on equal bytes.  */
-	addi	rNEG, rBITDIF, 1
-	orc	rNEG, rNEG, rBITDIF	/* 0's below LS differing byte.  */
-	sldi	rNEG, rNEG, 8		/* 1's above LS differing byte.  */
-	andc	rWORD1, rWORD1, rNEG	/* mask off MS bytes.  */
-	andc	rWORD2, rWORD2, rNEG
-	xor.	rBITDIF, rWORD1, rWORD2
-	sub	rRTN, rWORD1, rWORD2
-	blt	L(highbit)
-	sradi	rRTN, rRTN, 63
-	ori	rRTN, rRTN, 1
-	blr
-L(highbit):
-	sradi	rRTN, rWORD2, 63
-	ori	rRTN, rRTN, 1
-	blr
-
-#else
-L(endstring):
-	and	rTMP,r7F7F,rWORD1
-	beq	cr1,L(equal)
-	add	rTMP,rTMP,r7F7F
-	xor.	rBITDIF,rWORD1,rWORD2
-	andc	rNEG,rNEG,rTMP
-	blt	L(highbit)
-	cntlzd	rBITDIF,rBITDIF
-	cntlzd	rNEG,rNEG
-	addi	rNEG,rNEG,7
-	cmpd	cr1,rNEG,rBITDIF
-	sub	rRTN,rWORD1,rWORD2
-	blt	cr1,L(equal)
-	sradi	rRTN,rRTN,63		/* must return an int.  */
-	ori	rRTN,rRTN,1
-	blr
-L(equal):
-	li	rRTN,0
-	blr
-
-L(different):
-	ld	rWORD1,-8(rSTR1)
-	xor.	rBITDIF,rWORD1,rWORD2
-	sub	rRTN,rWORD1,rWORD2
-	blt	L(highbit)
-	sradi	rRTN,rRTN,63
-	ori	rRTN,rRTN,1
-	blr
-L(highbit):
-	sradi	rRTN,rWORD2,63
-	ori	rRTN,rRTN,1
-	blr
-#endif
-
-/* Oh well.  In this case, we just do a byte-by-byte comparison.  */
-	.align	4
-L(tail):
-	and.	rTMP,rTMP,rNEG
-	cmpd	cr1,rWORD1,rWORD2
-	bne	L(endstring)
-	addi	rSTR1,rSTR1,8
-	bne	cr1,L(different)
-	addi	rSTR2,rSTR2,8
-	cmpldi	cr1,rN,0
-L(unaligned):
-	mtctr	rN
-	ble	cr1,L(ux)
-L(uz):
-	lbz	rWORD1,0(rSTR1)
-	lbz	rWORD2,0(rSTR2)
-	.align	4
-L(u1):
-	cmpdi	cr1,rWORD1,0
-	bdz	L(u4)
-	cmpd	rWORD1,rWORD2
-	beq	cr1,L(u4)
-	bne	L(u4)
-	lbzu	rWORD3,1(rSTR1)
-	lbzu	rWORD4,1(rSTR2)
-	cmpdi	cr1,rWORD3,0
-	bdz	L(u3)
-	cmpd	rWORD3,rWORD4
-	beq	cr1,L(u3)
-	bne	L(u3)
-	lbzu	rWORD1,1(rSTR1)
-	lbzu	rWORD2,1(rSTR2)
-	cmpdi	cr1,rWORD1,0
-	bdz	L(u4)
-	cmpd	rWORD1,rWORD2
-	beq	cr1,L(u4)
-	bne	L(u4)
-	lbzu	rWORD3,1(rSTR1)
-	lbzu	rWORD4,1(rSTR2)
-	cmpdi	cr1,rWORD3,0
-	bdz	L(u3)
-	cmpd	rWORD3,rWORD4
-	beq	cr1,L(u3)
-	bne	L(u3)
-	lbzu	rWORD1,1(rSTR1)
-	lbzu	rWORD2,1(rSTR2)
-	b	L(u1)
-
-L(u3):  sub	rRTN,rWORD3,rWORD4
-	blr
-L(u4):	sub	rRTN,rWORD1,rWORD2
-	blr
-L(ux):
-	li	rRTN,0
-	blr
-END (STRNCMP)
-libc_hidden_builtin_def (strncmp)
diff --git a/sysdeps/powerpc/powerpc64/strncmp.S b/sysdeps/powerpc/powerpc64/strncmp.S
deleted file mode 100644
index 40a230242cbdf733..0000000000000000
--- a/sysdeps/powerpc/powerpc64/strncmp.S
+++ /dev/null
@@ -1,210 +0,0 @@
-/* Optimized strcmp implementation for PowerPC64.
-   Copyright (C) 2003-2021 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
-   <https://www.gnu.org/licenses/>.  */
-
-#include <sysdep.h>
-
-/* See strlen.s for comments on how the end-of-string testing works.  */
-
-/* int [r3] strncmp (const char *s1 [r3], const char *s2 [r4], size_t size [r5])  */
-
-#ifndef STRNCMP
-# define STRNCMP strncmp
-#endif
-
-ENTRY_TOCLESS (STRNCMP, 4)
-	CALL_MCOUNT 3
-
-#define rTMP2	r0
-#define rRTN	r3
-#define rSTR1	r3	/* first string arg */
-#define rSTR2	r4	/* second string arg */
-#define rN	r5	/* max string length */
-#define rWORD1	r6	/* current word in s1 */
-#define rWORD2	r7	/* current word in s2 */
-#define rFEFE	r8	/* constant 0xfefefefefefefeff (-0x0101010101010101) */
-#define r7F7F	r9	/* constant 0x7f7f7f7f7f7f7f7f */
-#define rNEG	r10	/* ~(word in s1 | 0x7f7f7f7f7f7f7f7f) */
-#define rBITDIF	r11	/* bits that differ in s1 & s2 words */
-#define rTMP	r12
-
-	dcbt	0,rSTR1
-	or	rTMP, rSTR2, rSTR1
-	lis	r7F7F, 0x7f7f
-	dcbt	0,rSTR2
-	clrldi.	rTMP, rTMP, 61
-	cmpldi	cr1, rN, 0
-	lis	rFEFE, -0x101
-	bne	L(unaligned)
-/* We are doubleword aligned so set up for two loops.  first a double word
-   loop, then fall into the byte loop if any residual.  */
-	srdi.	rTMP, rN, 3
-	clrldi	rN, rN, 61
-	addi	rFEFE, rFEFE, -0x101
-	addi	r7F7F, r7F7F, 0x7f7f
-	cmpldi	cr1, rN, 0
-	beq	L(unaligned)
-
-	mtctr	rTMP	/* Power4 wants mtctr 1st in dispatch group.  */
-	ld	rWORD1, 0(rSTR1)
-	ld	rWORD2, 0(rSTR2)
-	sldi	rTMP, rFEFE, 32
-	insrdi	r7F7F, r7F7F, 32, 0
-	add	rFEFE, rFEFE, rTMP
-	b	L(g1)
-
-L(g0):
-	ldu	rWORD1, 8(rSTR1)
-	bne-	cr1, L(different)
-	ldu	rWORD2, 8(rSTR2)
-L(g1):	add	rTMP, rFEFE, rWORD1
-	nor	rNEG, r7F7F, rWORD1
-	bdz	L(tail)
-	and.	rTMP, rTMP, rNEG
-	cmpd	cr1, rWORD1, rWORD2
-	beq+	L(g0)
-
-/* OK. We've hit the end of the string. We need to be careful that
-   we don't compare two strings as different because of gunk beyond
-   the end of the strings...  */
-
-#ifdef __LITTLE_ENDIAN__
-L(endstring):
-	addi    rTMP2, rTMP, -1
-	beq	cr1, L(equal)
-	andc    rTMP2, rTMP2, rTMP
-	rldimi	rTMP2, rTMP2, 1, 0
-	and	rWORD2, rWORD2, rTMP2	/* Mask off gunk.  */
-	and	rWORD1, rWORD1, rTMP2
-	cmpd	cr1, rWORD1, rWORD2
-	beq	cr1, L(equal)
-	xor	rBITDIF, rWORD1, rWORD2	/* rBITDIF has bits that differ.  */
-	neg	rNEG, rBITDIF
-	and	rNEG, rNEG, rBITDIF	/* rNEG has LS bit that differs.  */
-	cntlzd	rNEG, rNEG		/* bitcount of the bit.  */
-	andi.	rNEG, rNEG, 56		/* bitcount to LS byte that differs. */
-	sld	rWORD1, rWORD1, rNEG	/* shift left to clear MS bytes.  */
-	sld	rWORD2, rWORD2, rNEG
-	xor.	rBITDIF, rWORD1, rWORD2
-	sub	rRTN, rWORD1, rWORD2
-	blt-	L(highbit)
-	sradi	rRTN, rRTN, 63		/* must return an int.  */
-	ori	rRTN, rRTN, 1
-	blr
-L(equal):
-	li	rRTN, 0
-	blr
-
-L(different):
-	ld	rWORD1, -8(rSTR1)
-	xor	rBITDIF, rWORD1, rWORD2	/* rBITDIF has bits that differ.  */
-	neg	rNEG, rBITDIF
-	and	rNEG, rNEG, rBITDIF	/* rNEG has LS bit that differs.  */
-	cntlzd	rNEG, rNEG		/* bitcount of the bit.  */
-	andi.	rNEG, rNEG, 56		/* bitcount to LS byte that differs. */
-	sld	rWORD1, rWORD1, rNEG	/* shift left to clear MS bytes.  */
-	sld	rWORD2, rWORD2, rNEG
-	xor.	rBITDIF, rWORD1, rWORD2
-	sub	rRTN, rWORD1, rWORD2
-	blt-	L(highbit)
-	sradi	rRTN, rRTN, 63
-	ori	rRTN, rRTN, 1
-	blr
-L(highbit):
-	sradi	rRTN, rWORD2, 63
-	ori	rRTN, rRTN, 1
-	blr
-
-#else
-L(endstring):
-	and	rTMP, r7F7F, rWORD1
-	beq	cr1, L(equal)
-	add	rTMP, rTMP, r7F7F
-	xor.	rBITDIF, rWORD1, rWORD2
-	andc	rNEG, rNEG, rTMP
-	blt-	L(highbit)
-	cntlzd	rBITDIF, rBITDIF
-	cntlzd	rNEG, rNEG
-	addi	rNEG, rNEG, 7
-	cmpd	cr1, rNEG, rBITDIF
-	sub	rRTN, rWORD1, rWORD2
-	blt-	cr1, L(equal)
-	sradi	rRTN, rRTN, 63		/* must return an int.  */
-	ori	rRTN, rRTN, 1
-	blr
-L(equal):
-	li	rRTN, 0
-	blr
-
-L(different):
-	ld	rWORD1, -8(rSTR1)
-	xor.	rBITDIF, rWORD1, rWORD2
-	sub	rRTN, rWORD1, rWORD2
-	blt-	L(highbit)
-	sradi	rRTN, rRTN, 63
-	ori	rRTN, rRTN, 1
-	blr
-L(highbit):
-	sradi	rRTN, rWORD2, 63
-	ori	rRTN, rRTN, 1
-	blr
-#endif
-
-/* Oh well.  In this case, we just do a byte-by-byte comparison.  */
-	.align 4
-L(tail):
-	and.	rTMP, rTMP, rNEG
-	cmpd	cr1, rWORD1, rWORD2
-	bne-	L(endstring)
-	addi	rSTR1, rSTR1, 8
-	bne-	cr1, L(different)
-	addi	rSTR2, rSTR2, 8
-	cmpldi	cr1, rN, 0
-L(unaligned):
-	mtctr   rN	/* Power4 wants mtctr 1st in dispatch group */
-	bgt	cr1, L(uz)
-L(ux):
-	li	rRTN, 0
-	blr
-	.align 4
-L(uz):
-	lbz	rWORD1, 0(rSTR1)
-	lbz	rWORD2, 0(rSTR2)
-	nop
-	b	L(u1)
-L(u0):
-	lbzu	rWORD2, 1(rSTR2)
-L(u1):
-	bdz	L(u3)
-	cmpdi	cr1, rWORD1, 0
-	cmpd	rWORD1, rWORD2
-	beq-	cr1, L(u3)
-	lbzu	rWORD1, 1(rSTR1)
-	bne-	L(u2)
-	lbzu	rWORD2, 1(rSTR2)
-	bdz	L(u3)
-	cmpdi	cr1, rWORD1, 0
-	cmpd	rWORD1, rWORD2
-	bne-	L(u3)
-	lbzu	rWORD1, 1(rSTR1)
-	bne+	cr1, L(u0)
-
-L(u2):	lbzu	rWORD1, -1(rSTR1)
-L(u3):	sub	rRTN, rWORD1, rWORD2
-	blr
-END (STRNCMP)
-libc_hidden_builtin_def (strncmp)