powerpc64: Remove old strncmp optimization

This patch cleans up the power4 strncmp optimization for powerpc64 which
is unlikely to be used anywhere.

Tested on ppc64le with and without --disable-multi-arch flag.

Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

5 files changed, 2 insertions, 256 deletions

diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index 6f2436b660..ed25e234ba 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -12,8 +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-power4 strncmp-ppc64 \
+		   strncmp-power8 strncmp-power7 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 5a3c7a5886..238f784146 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -171,8 +171,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      __strncmp_power8)
 	      IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_FEATURE_ARCH_2_06,
 			      __strncmp_power7)
-	      IFUNC_IMPL_ADD (array, i, strncmp, hwcap & PPC_FEATURE_POWER4,
-			      __strncmp_power4)
 	      IFUNC_IMPL_ADD (array, i, strncmp, 1,
 			      __strncmp_ppc))
 
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp-power4.S b/sysdeps/powerpc/powerpc64/multiarch/strncmp-power4.S
deleted file mode 100644
index df6ad6ae9c..0000000000
--- a/sysdeps/powerpc/powerpc64/multiarch/strncmp-power4.S
+++ /dev/null
@@ -1,23 +0,0 @@
-/* Copyright (C) 2013-2022 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_power4
-
-#undef libc_hidden_builtin_def
-#define libc_hidden_builtin_def(name)
-
-#include <sysdeps/powerpc/powerpc64/power4/strncmp.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strncmp.c b/sysdeps/powerpc/powerpc64/multiarch/strncmp.c
index da3de73c27..8aeb23d4a3 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_power4 attribute_hidden;
 extern __typeof (strncmp) __strncmp_power7 attribute_hidden;
 extern __typeof (strncmp) __strncmp_power8 attribute_hidden;
 # ifdef __LITTLE_ENDIAN__
@@ -46,7 +45,5 @@ libc_ifunc_redirected (__redirect_strncmp, strncmp,
 		       ? __strncmp_power8
 		       : (hwcap & PPC_FEATURE_ARCH_2_06)
 			 ? __strncmp_power7
-			 : (hwcap & PPC_FEATURE_POWER4)
-			   ? __strncmp_power4
-			   : __strncmp_ppc);
+			 : __strncmp_ppc);
 #endif
diff --git a/sysdeps/powerpc/powerpc64/power4/strncmp.S b/sysdeps/powerpc/powerpc64/power4/strncmp.S
deleted file mode 100644
index 8c82518504..0000000000
--- a/sysdeps/powerpc/powerpc64/power4/strncmp.S
+++ /dev/null
@@ -1,225 +0,0 @@
-/* Optimized strcmp implementation for PowerPC64.
-   Copyright (C) 2003-2022 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])  */
-
-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 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
-	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 */
-	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)