powerpc: Remove strncmp variants

The default powerpc32, power4, and power7 might access OOB memory which
trigers invalid memory access with stratcliff.

Although the fix is simple, just to reorder the by loads before the
mismatch checks; all implementation just add one optimization: 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 adds
unaligned optimization.  So instead of adjust powerpc32 implementations,
just use default implementation instead.

Checked on powerpc-linux-gnu built without multi-arch for powerpc,
power4, and power7.

8 files changed, 1 insertions, 701 deletions

diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/Makefile b/sysdeps/powerpc/powerpc32/power4/multiarch/Makefile
index b2f9deefb8..0a4e828435 100644
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/Makefile
@@ -5,7 +5,7 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \
 		   mempcpy-power7 mempcpy-ppc32 memchr-power7 \
 		   memchr-ppc32 memrchr-power7 memrchr-ppc32 rawmemchr-power7 \
 		   rawmemchr-ppc32 strlen-power7 strlen-ppc32 strnlen-power7 \
-		   strnlen-ppc32 strncmp-power7 strncmp-ppc32 \
+		   strnlen-ppc32 \
 		   strcasecmp-power7 strcasecmp_l-power7 strncase-power7 \
 		   strncase_l-power7 strchrnul-power7 strchrnul-ppc32 \
 		   strchr-power7 strchr-ppc32 \
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c
index 3b95ad2c12..b4f80539e7 100644
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c
@@ -81,13 +81,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __strnlen_power7)
 	      IFUNC_IMPL_ADD (array, i, strnlen, 1,
 			      __strnlen_ppc))
-
-  /* Support sysdeps/powerpc/powerpc32/multiarch/strncmp.c.  */
-  IFUNC_IMPL (i, name, strncmp,
-	      IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_FEATURE_HAS_VSX,
-			      __strncmp_power7)
-	      IFUNC_IMPL_ADD (array, i, strncmp, 1,
-			      __strncmp_ppc))
 #endif
 
   /* Support sysdeps/powerpc/powerpc32/power4/multiarch/memcmp.c.  */
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-power7.S b/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-power7.S
deleted file mode 100644
index 068b1bb8ad..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-power7.S
+++ /dev/null
@@ -1,38 +0,0 @@
-/* Optimized strcmp implementation for POWER7/PowerPC32.
-   Copyright (C) 2013-2023 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>
-
-#undef EALIGN
-#define EALIGN(name, alignt, words)				\
- .globl C_SYMBOL_NAME(__strncmp_power7);			\
- .type C_SYMBOL_NAME(__strncmp_power7),@function;		\
- .align ALIGNARG(alignt);					\
- EALIGN_W_##words;						\
- C_LABEL(__strncmp_power7)					\
- cfi_startproc;
-
-#undef END
-#define END(name)						\
- cfi_endproc;							\
- ASM_SIZE_DIRECTIVE(__strncmp_power7)
-
-#undef libc_hidden_builtin_def
-#define libc_hidden_builtin_def(name)
-
-#include <sysdeps/powerpc/powerpc32/power7/strncmp.S>
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-ppc32.S b/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-ppc32.S
deleted file mode 100644
index b04afd4478..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp-ppc32.S
+++ /dev/null
@@ -1,40 +0,0 @@
-/* Copyright (C) 2013-2023 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>
-
-#if defined SHARED && IS_IN (libc)
-# undef EALIGN
-# define EALIGN(name, alignt, words)				\
-  .globl C_SYMBOL_NAME(__strncmp_ppc);			\
-  .type C_SYMBOL_NAME(__strncmp_ppc),@function;		\
-  .align ALIGNARG(alignt);					\
-  EALIGN_W_##words;						\
-  C_LABEL(__strncmp_ppc)					\
-  cfi_startproc;
-
-# undef END
-# define END(name)						\
-  cfi_endproc;							\
-  ASM_SIZE_DIRECTIVE(__strncmp_ppc)
-
-# undef libc_hidden_builtin_def
-# define libc_hidden_builtin_def(name)				\
-    .globl __GI_strncmp; __GI_strncmp = __strncmp_ppc
-#endif
-
-#include <sysdeps/powerpc/powerpc32/power4/strncmp.S>
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp.c b/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp.c
deleted file mode 100644
index 79046015e5..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/strncmp.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/* Multiple versions of strncmp.
-   Copyright (C) 2013-2023 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 multiple versions only for definition in libc.  */
-#if defined SHARED && IS_IN (libc)
-# define strncmp __redirect_strncmp
-/* Omit the strncmp inline definitions because it would redefine strncmp.  */
-# define __NO_STRING_INLINES
-# include <string.h>
-# include <shlib-compat.h>
-# include "init-arch.h"
-
-extern __typeof (strncmp) __strncmp_ppc attribute_hidden;
-extern __typeof (strncmp) __strncmp_power4 attribute_hidden;
-extern __typeof (strncmp) __strncmp_power7 attribute_hidden;
-# undef strncmp
-
-/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle
-   ifunc symbol properly.  */
-libc_ifunc_redirected (__redirect_strncmp, strncmp,
-		       (hwcap & PPC_FEATURE_HAS_VSX)
-		       ? __strncmp_power7
-		       : __strncmp_ppc);
-#endif
diff --git a/sysdeps/powerpc/powerpc32/power4/strncmp.S b/sysdeps/powerpc/powerpc32/power4/strncmp.S
deleted file mode 100644
index 1f65c947cd..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/strncmp.S
+++ /dev/null
@@ -1,196 +0,0 @@
-/* Optimized strcmp implementation for PowerPC32.
-   Copyright (C) 2003-2023 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])  */
-
-EALIGN (strncmp, 4, 0)
-
-#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 0xfefefeff (-0x01010101) */
-#define r7F7F	r9	/* constant 0x7f7f7f7f */
-#define rNEG	r10	/* ~(word in s1 | 0x7f7f7f7f) */
-#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
-	clrlwi.	rTMP, rTMP, 30
-	cmplwi	cr1, rN, 0
-	lis	rFEFE, -0x101
-	bne	L(unaligned)
-/* We are word aligned so set up for two loops.  first a word
-   loop, then fall into the byte loop if any residual.  */
-	srwi.	rTMP, rN, 2
-	clrlwi	rN, rN, 30
-	addi	rFEFE, rFEFE, -0x101
-	addi	r7F7F, r7F7F, 0x7f7f
-	cmplwi	cr1, rN, 0
-	beq	L(unaligned)
-
-	mtctr	rTMP	/* Power4 wants mtctr 1st in dispatch group.  */
-	lwz	rWORD1, 0(rSTR1)
-	lwz	rWORD2, 0(rSTR2)
-	b	L(g1)
-
-L(g0):
-	lwzu	rWORD1, 4(rSTR1)
-	bne-	cr1, L(different)
-	lwzu	rWORD2, 4(rSTR2)
-L(g1):	add	rTMP, rFEFE, rWORD1
-	nor	rNEG, r7F7F, rWORD1
-	bdz	L(tail)
-	and.	rTMP, rTMP, rNEG
-	cmpw	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):
-	slwi	rTMP, rTMP, 1
-	addi    rTMP2, rTMP, -1
-	andc    rTMP2, rTMP2, rTMP
-	and	rWORD2, rWORD2, rTMP2		/* Mask off gunk.  */
-	and	rWORD1, rWORD1, rTMP2
-	rlwinm	rTMP2, rWORD2, 8, 0xffffffff	/* Byte reverse word.  */
-	rlwinm	rTMP, rWORD1, 8, 0xffffffff
-	rldimi	rTMP2, rWORD2, 24, 32
-	rldimi	rTMP, rWORD1, 24, 32
-	rlwimi	rTMP2, rWORD2, 24, 16, 23
-	rlwimi	rTMP, rWORD1, 24, 16, 23
-	xor.	rBITDIF, rTMP, rTMP2
-	sub	rRTN, rTMP, rTMP2
-	bgelr+
-	ori	rRTN, rTMP2, 1
-	blr
-
-L(different):
-	lwz	rWORD1, -4(rSTR1)
-	rlwinm	rTMP2, rWORD2, 8, 0xffffffff	/* Byte reverse word.  */
-	rlwinm	rTMP, rWORD1, 8, 0xffffffff
-	rldimi	rTMP2, rWORD2, 24, 32
-	rldimi	rTMP, rWORD1, 24, 32
-	rlwimi	rTMP2, rWORD2, 24, 16, 23
-	rlwimi	rTMP, rWORD1, 24, 16, 23
-	xor.	rBITDIF, rTMP, rTMP2
-	sub	rRTN, rTMP, rTMP2
-	bgelr+
-	ori	rRTN, rTMP2, 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)
-	cntlzw	rBITDIF, rBITDIF
-	cntlzw	rNEG, rNEG
-	addi	rNEG, rNEG, 7
-	cmpw	cr1, rNEG, rBITDIF
-	sub	rRTN, rWORD1, rWORD2
-	bgelr+	cr1
-L(equal):
-	li	rRTN, 0
-	blr
-
-L(different):
-	lwz	rWORD1, -4(rSTR1)
-	xor.	rBITDIF, rWORD1, rWORD2
-	sub	rRTN, rWORD1, rWORD2
-	bgelr+
-L(highbit):
-	ori	rRTN, rWORD2, 1
-	blr
-#endif
-
-/* Oh well.  In this case, we just do a byte-by-byte comparison.  */
-	.align 4
-L(tail):
-	and.	rTMP, rTMP, rNEG
-	cmpw	cr1, rWORD1, rWORD2
-	bne-	L(endstring)
-	addi	rSTR1, rSTR1, 4
-	bne-	cr1, L(different)
-	addi	rSTR2, rSTR2, 4
-	cmplwi	cr1, rN, 0
-L(unaligned):
-	mtctr   rN	/* Power4 wants mtctr 1st in dispatch group */
-	ble	cr1, L(ux)
-L(uz):
-	lbz	rWORD1, 0(rSTR1)
-	lbz	rWORD2, 0(rSTR2)
-	.align 4
-L(u1):
-	cmpwi	cr1, rWORD1, 0
-	bdz	L(u4)
-	cmpw	rWORD1, rWORD2
-	beq-	cr1, L(u4)
-	bne-	L(u4)
-	lbzu    rWORD3, 1(rSTR1)
-	lbzu	rWORD4, 1(rSTR2)
-	cmpwi	cr1, rWORD3, 0
-	bdz	L(u3)
-	cmpw	rWORD3, rWORD4
-	beq-    cr1, L(u3)
-	bne-    L(u3)
-	lbzu	rWORD1, 1(rSTR1)
-	lbzu	rWORD2, 1(rSTR2)
-	cmpwi	cr1, rWORD1, 0
-	bdz	L(u4)
-	cmpw	rWORD1, rWORD2
-	beq-	cr1, L(u4)
-	bne-	L(u4)
-	lbzu	rWORD3, 1(rSTR1)
-	lbzu	rWORD4, 1(rSTR2)
-	cmpwi	cr1, rWORD3, 0
-	bdz	L(u3)
-	cmpw	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/powerpc32/power7/strncmp.S b/sysdeps/powerpc/powerpc32/power7/strncmp.S
deleted file mode 100644
index bbaab6ca0e..0000000000
--- a/sysdeps/powerpc/powerpc32/power7/strncmp.S
+++ /dev/null
@@ -1,199 +0,0 @@
-/* Optimized strcmp implementation for POWER7/PowerPC32.
-   Copyright (C) 2010-2023 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])  */
-
-EALIGN (strncmp,5,0)
-
-#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 0xfefefeff (-0x01010101) */
-#define r7F7F	r9	/* constant 0x7f7f7f7f */
-#define rNEG	r10	/* ~(word in s1 | 0x7f7f7f7f) */
-#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
-	clrlwi.	rTMP,rTMP,30
-	cmplwi	cr1,rN,0
-	lis	rFEFE,-0x101
-	bne	L(unaligned)
-/* We are word aligned so set up for two loops.  first a word
-   loop, then fall into the byte loop if any residual.  */
-	srwi.	rTMP,rN,2
-	clrlwi	rN,rN,30
-	addi	rFEFE,rFEFE,-0x101
-	addi	r7F7F,r7F7F,0x7f7f
-	cmplwi	cr1,rN,0
-	beq	L(unaligned)
-
-	mtctr	rTMP
-	lwz	rWORD1,0(rSTR1)
-	lwz	rWORD2,0(rSTR2)
-	b	L(g1)
-
-L(g0):
-	lwzu	rWORD1,4(rSTR1)
-	bne	cr1,L(different)
-	lwzu	rWORD2,4(rSTR2)
-L(g1):	add	rTMP,rFEFE,rWORD1
-	nor	rNEG,r7F7F,rWORD1
-	bdz	L(tail)
-	and.	rTMP,rTMP,rNEG
-	cmpw	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):
-	slwi	rTMP, rTMP, 1
-	addi    rTMP2, rTMP, -1
-	andc    rTMP2, rTMP2, rTMP
-	and	rWORD2, rWORD2, rTMP2		/* Mask off gunk.  */
-	and	rWORD1, rWORD1, rTMP2
-	rlwinm	rTMP2, rWORD2, 8, 0xffffffff	/* Byte reverse word.  */
-	rlwinm	rTMP, rWORD1, 8, 0xffffffff
-	rldimi	rTMP2, rWORD2, 24, 32
-	rldimi	rTMP, rWORD1, 24, 32
-	rlwimi	rTMP2, rWORD2, 24, 16, 23
-	rlwimi	rTMP, rWORD1, 24, 16, 23
-	xor.	rBITDIF, rTMP, rTMP2
-	sub	rRTN, rTMP, rTMP2
-	bgelr
-	ori	rRTN, rTMP2, 1
-	blr
-
-L(different):
-	lwz	rWORD1, -4(rSTR1)
-	rlwinm	rTMP2, rWORD2, 8, 0xffffffff	/* Byte reverse word.  */
-	rlwinm	rTMP, rWORD1, 8, 0xffffffff
-	rldimi	rTMP2, rWORD2, 24, 32
-	rldimi	rTMP, rWORD1, 24, 32
-	rlwimi	rTMP2, rWORD2, 24, 16, 23
-	rlwimi	rTMP, rWORD1, 24, 16, 23
-	xor.	rBITDIF, rTMP, rTMP2
-	sub	rRTN, rTMP, rTMP2
-	bgelr
-	ori	rRTN, rTMP2, 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)
-	cntlzw	rBITDIF,rBITDIF
-	cntlzw	rNEG,rNEG
-	addi	rNEG,rNEG,7
-	cmpw	cr1,rNEG,rBITDIF
-	sub	rRTN,rWORD1,rWORD2
-	bgelr	cr1
-L(equal):
-	li	rRTN,0
-	blr
-
-L(different):
-	lwz	rWORD1,-4(rSTR1)
-	xor.	rBITDIF,rWORD1,rWORD2
-	sub	rRTN,rWORD1,rWORD2
-	bgelr
-L(highbit):
-	ori	rRTN, rWORD2, 1
-	blr
-#endif
-
-/* Oh well. In this case, we just do a byte-by-byte comparison.  */
-	.align	4
-L(tail):
-	and.	rTMP,rTMP,rNEG
-	cmpw	cr1,rWORD1,rWORD2
-	bne	L(endstring)
-	addi	rSTR1,rSTR1,4
-	bne	cr1,L(different)
-	addi	rSTR2,rSTR2,4
-	cmplwi	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):
-	cmpwi	cr1,rWORD1,0
-	bdz	L(u4)
-	cmpw	rWORD1,rWORD2
-	beq	cr1,L(u4)
-	bne	L(u4)
-	lbzu	rWORD3,1(rSTR1)
-	lbzu	rWORD4,1(rSTR2)
-	cmpwi	cr1,rWORD3,0
-	bdz	L(u3)
-	cmpw	rWORD3,rWORD4
-	beq	cr1,L(u3)
-	bne	L(u3)
-	lbzu	rWORD1,1(rSTR1)
-	lbzu	rWORD2,1(rSTR2)
-	cmpwi	cr1,rWORD1,0
-	bdz	L(u4)
-	cmpw	rWORD1,rWORD2
-	beq	cr1,L(u4)
-	bne	L(u4)
-	lbzu	rWORD3,1(rSTR1)
-	lbzu	rWORD4,1(rSTR2)
-	cmpwi	cr1,rWORD3,0
-	bdz	L(u3)
-	cmpw	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/powerpc32/strncmp.S b/sysdeps/powerpc/powerpc32/strncmp.S
deleted file mode 100644
index 28cae4ddce..0000000000
--- a/sysdeps/powerpc/powerpc32/strncmp.S
+++ /dev/null
@@ -1,181 +0,0 @@
-/* Optimized strcmp implementation for PowerPC32.
-   Copyright (C) 2003-2023 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])  */
-
-EALIGN (strncmp, 4, 0)
-
-#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 0xfefefeff (-0x01010101) */
-#define r7F7F	r9	/* constant 0x7f7f7f7f */
-#define rNEG	r10	/* ~(word in s1 | 0x7f7f7f7f) */
-#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
-	clrlwi.	rTMP, rTMP, 30
-	cmplwi	cr1, rN, 0
-	lis	rFEFE, -0x101
-	bne	L(unaligned)
-/* We are word aligned so set up for two loops.  first a word
-   loop, then fall into the byte loop if any residual.  */
-	srwi.	rTMP, rN, 2
-	clrlwi	rN, rN, 30
-	addi	rFEFE, rFEFE, -0x101
-	addi	r7F7F, r7F7F, 0x7f7f
-	cmplwi	cr1, rN, 0
-	beq	L(unaligned)
-
-	mtctr	rTMP	/* Power4 wants mtctr 1st in dispatch group.  */
-	lwz	rWORD1, 0(rSTR1)
-	lwz	rWORD2, 0(rSTR2)
-	b	L(g1)
-
-L(g0):
-	lwzu	rWORD1, 4(rSTR1)
-	bne-	cr1, L(different)
-	lwzu	rWORD2, 4(rSTR2)
-L(g1):	add	rTMP, rFEFE, rWORD1
-	nor	rNEG, r7F7F, rWORD1
-	bdz	L(tail)
-	and.	rTMP, rTMP, rNEG
-	cmpw	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):
-	slwi	rTMP, rTMP, 1
-	addi    rTMP2, rTMP, -1
-	andc    rTMP2, rTMP2, rTMP
-	and	rWORD2, rWORD2, rTMP2		/* Mask off gunk.  */
-	and	rWORD1, rWORD1, rTMP2
-	rlwinm	rTMP2, rWORD2, 8, 0xffffffff	/* Byte reverse word.  */
-	rlwinm	rTMP, rWORD1, 8, 0xffffffff
-	rlwimi	rTMP2, rWORD2, 24, 0, 7
-	rlwimi	rTMP, rWORD1, 24, 0, 7
-	rlwimi	rTMP2, rWORD2, 24, 16, 23
-	rlwimi	rTMP, rWORD1, 24, 16, 23
-	xor.	rBITDIF, rTMP, rTMP2
-	sub	rRTN, rTMP, rTMP2
-	bgelr+
-	ori	rRTN, rTMP2, 1
-	blr
-
-L(different):
-	lwz	rWORD1, -4(rSTR1)
-	rlwinm	rTMP2, rWORD2, 8, 0xffffffff	/* Byte reverse word.  */
-	rlwinm	rTMP, rWORD1, 8, 0xffffffff
-	rlwimi	rTMP2, rWORD2, 24, 0, 7
-	rlwimi	rTMP, rWORD1, 24, 0, 7
-	rlwimi	rTMP2, rWORD2, 24, 16, 23
-	rlwimi	rTMP, rWORD1, 24, 16, 23
-	xor.	rBITDIF, rTMP, rTMP2
-	sub	rRTN, rTMP, rTMP2
-	bgelr+
-	ori	rRTN, rTMP2, 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)
-	cntlzw	rBITDIF, rBITDIF
-	cntlzw	rNEG, rNEG
-	addi	rNEG, rNEG, 7
-	cmpw	cr1, rNEG, rBITDIF
-	sub	rRTN, rWORD1, rWORD2
-	bgelr+	cr1
-L(equal):
-	li	rRTN, 0
-	blr
-
-L(different):
-	lwz	rWORD1, -4(rSTR1)
-	xor.	rBITDIF, rWORD1, rWORD2
-	sub	rRTN, rWORD1, rWORD2
-	bgelr+
-L(highbit):
-	ori	rRTN, rWORD2, 1
-	blr
-#endif
-
-/* Oh well.  In this case, we just do a byte-by-byte comparison.  */
-	.align 4
-L(tail):
-	and.	rTMP, rTMP, rNEG
-	cmpw	cr1, rWORD1, rWORD2
-	bne-	L(endstring)
-	addi	rSTR1, rSTR1, 4
-	bne-	cr1, L(different)
-	addi	rSTR2, rSTR2, 4
-	cmplwi	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)
-	cmpwi	cr1, rWORD1, 0
-	cmpw	rWORD1, rWORD2
-	beq-	cr1, L(u3)
-	lbzu	rWORD1, 1(rSTR1)
-	bne-	L(u2)
-	lbzu	rWORD2, 1(rSTR2)
-	bdz	L(u3)
-	cmpwi	cr1, rWORD1, 0
-	cmpw	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)