i686: Remove bzero optimizations

The symbol is not present in current POSIX specification and compiler
already generates memset call.

14 files changed, 22 insertions, 181 deletions

diff --git a/sysdeps/i386/bzero.S b/sysdeps/i386/bzero.S
deleted file mode 100644
index c8dd47b4da..0000000000
--- a/sysdeps/i386/bzero.S
+++ /dev/null
@@ -1,5 +0,0 @@
-#define USE_AS_BZERO
-#define memset __bzero
-#include "memset.S"
-
-weak_alias (__bzero, bzero)
diff --git a/sysdeps/i386/i586/bzero.S b/sysdeps/i386/i586/bzero.S
deleted file mode 100644
index 2a106719a4..0000000000
--- a/sysdeps/i386/i586/bzero.S
+++ /dev/null
@@ -1,4 +0,0 @@
-#define USE_AS_BZERO
-#define memset __bzero
-#include <sysdeps/i386/i586/memset.S>
-weak_alias (__bzero, bzero)
diff --git a/sysdeps/i386/i586/memset.S b/sysdeps/i386/i586/memset.S
index ae09c3b40a..672af41398 100644
--- a/sysdeps/i386/i586/memset.S
+++ b/sysdeps/i386/i586/memset.S
@@ -23,15 +23,11 @@
 #define PARMS	4+4	/* space for 1 saved reg */
 #define RTN	PARMS
 #define DEST	RTN
-#ifdef USE_AS_BZERO
-# define LEN	DEST+4
-#else
-# define CHR	DEST+4
-# define LEN	CHR+4
-#endif
+#define CHR	DEST+4
+#define LEN	CHR+4
 
         .text
-#if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO
+#if defined SHARED && IS_IN (libc)
 ENTRY (__memset_chk)
 	movl	12(%esp), %eax
 	cmpl	%eax, 16(%esp)
@@ -46,15 +42,11 @@ ENTRY (memset)
 	movl	DEST(%esp), %edi
 	cfi_rel_offset (edi, 0)
 	movl	LEN(%esp), %edx
-#ifdef USE_AS_BZERO
-	xorl	%eax, %eax	/* we fill with 0 */
-#else
 	movb	CHR(%esp), %al
 	movb	%al, %ah
 	movl	%eax, %ecx
 	shll	$16, %eax
 	movw	%cx, %ax
-#endif
 	cld
 
 /* If less than 36 bytes to write, skip tricky code (it wouldn't work).  */
@@ -100,10 +92,8 @@ L(2):	shrl	$2, %ecx	/* convert byte count to longword count */
 	rep
 	stosb
 
-#ifndef USE_AS_BZERO
 	/* Load result (only if used as memset).  */
 	movl DEST(%esp), %eax	/* start address of destination is result */
-#endif
 	popl	%edi
 	cfi_adjust_cfa_offset (-4)
 	cfi_restore (edi)
diff --git a/sysdeps/i386/i686/bzero.S b/sysdeps/i386/i686/bzero.S
deleted file mode 100644
index c7898f18e0..0000000000
--- a/sysdeps/i386/i686/bzero.S
+++ /dev/null
@@ -1,4 +0,0 @@
-#define USE_AS_BZERO
-#define memset __bzero
-#include <sysdeps/i386/i686/memset.S>
-weak_alias (__bzero, bzero)
diff --git a/sysdeps/i386/i686/memset.S b/sysdeps/i386/i686/memset.S
index fd5b26aeae..3cb86c016d 100644
--- a/sysdeps/i386/i686/memset.S
+++ b/sysdeps/i386/i686/memset.S
@@ -21,18 +21,13 @@
 #include "asm-syntax.h"
 
 #define PARMS	4+4	/* space for 1 saved reg */
-#ifdef USE_AS_BZERO
-# define DEST	PARMS
-# define LEN	DEST+4
-#else
-# define RTN	PARMS
-# define DEST	RTN
-# define CHR	DEST+4
-# define LEN	CHR+4
-#endif
+#define RTN	PARMS
+#define DEST	RTN
+#define CHR	DEST+4
+#define LEN	CHR+4
 
         .text
-#if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO
+#if defined SHARED && IS_IN (libc)
 ENTRY_CHK (__memset_chk)
 	movl	12(%esp), %eax
 	cmpl	%eax, 16(%esp)
@@ -46,11 +41,7 @@ ENTRY (memset)
 	cfi_adjust_cfa_offset (4)
 	movl	DEST(%esp), %edx
 	movl	LEN(%esp), %ecx
-#ifdef USE_AS_BZERO
-	xorl	%eax, %eax	/* fill with 0 */
-#else
 	movzbl	CHR(%esp), %eax
-#endif
 	jecxz	1f
 	movl	%edx, %edi
 	cfi_rel_offset (edi, 0)
@@ -70,9 +61,7 @@ ENTRY (memset)
 2:	movl	%ecx, %edx
 	shrl	$2, %ecx
 	andl	$3, %edx
-#ifndef USE_AS_BZERO
 	imul	$0x01010101, %eax
-#endif
 	rep
 	stosl
 	movl	%edx, %ecx
@@ -80,9 +69,7 @@ ENTRY (memset)
 	stosb
 
 1:
-#ifndef USE_AS_BZERO
 	movl DEST(%esp), %eax	/* start address of destination is result */
-#endif
 	popl	%edi
 	cfi_adjust_cfa_offset (-4)
 	cfi_restore (edi)
diff --git a/sysdeps/i386/i686/multiarch/Makefile b/sysdeps/i386/i686/multiarch/Makefile
index 02fa02658e..9fe5ea8639 100644
--- a/sysdeps/i386/i686/multiarch/Makefile
+++ b/sysdeps/i386/i686/multiarch/Makefile
@@ -1,9 +1,9 @@
 ifeq ($(subdir),string)
 gen-as-const-headers += locale-defines.sym
-sysdep_routines += bzero-sse2 memset-sse2 memcpy-ssse3 mempcpy-ssse3 \
+sysdep_routines += memset-sse2 memcpy-ssse3 mempcpy-ssse3 \
 		   memmove-ssse3 memcpy-ssse3-rep mempcpy-ssse3-rep \
 		   memmove-ssse3-rep \
-		   memset-sse2-rep bzero-sse2-rep strcmp-ssse3 \
+		   memset-sse2-rep strcmp-ssse3 \
 		   strcmp-sse4 strncmp-c strncmp-ssse3 strncmp-sse4 \
 		   memcmp-ssse3 memcmp-sse4 varshift \
 		   strlen-sse2 strlen-sse2-bsf strncpy-c strcpy-ssse3 \
@@ -21,7 +21,7 @@ sysdep_routines += bzero-sse2 memset-sse2 memcpy-ssse3 mempcpy-ssse3 \
 		   memcpy-sse2-unaligned \
 		   mempcpy-sse2-unaligned memmove-sse2-unaligned \
 		   strcspn-c strpbrk-c strspn-c \
-		   bzero-ia32 rawmemchr-ia32 \
+		   rawmemchr-ia32 \
 		   memchr-ia32 memcmp-ia32 memcpy-ia32 memmove-ia32 \
 		   mempcpy-ia32 memset-ia32 strcat-ia32 strchr-ia32 \
 		   strrchr-ia32 strcpy-ia32 strcmp-ia32 strcspn-ia32 \
diff --git a/sysdeps/i386/i686/multiarch/bzero-ia32.S b/sysdeps/i386/i686/multiarch/bzero-ia32.S
deleted file mode 100644
index 96afe9bad1..0000000000
--- a/sysdeps/i386/i686/multiarch/bzero-ia32.S
+++ /dev/null
@@ -1,37 +0,0 @@
-/* bzero optimized for i686.
-   Copyright (C) 2017-2022 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>
-
-#if IS_IN (libc)
-# define __bzero __bzero_ia32
-
-# ifdef SHARED
-#  undef libc_hidden_builtin_def
-/* IFUNC doesn't work with the hidden functions in shared library since
-   they will be called without setting up EBX needed for PLT which is
-   used by IFUNC.  */
-#  define libc_hidden_builtin_def(name) \
-	.globl __GI___bzero; __GI___bzero = __bzero
-# endif
-
-# undef weak_alias
-# define weak_alias(original, alias)
-
-# include <sysdeps/i386/i686/bzero.S>
-#endif
diff --git a/sysdeps/i386/i686/multiarch/bzero-sse2-rep.S b/sysdeps/i386/i686/multiarch/bzero-sse2-rep.S
deleted file mode 100644
index 507b288bb3..0000000000
--- a/sysdeps/i386/i686/multiarch/bzero-sse2-rep.S
+++ /dev/null
@@ -1,3 +0,0 @@
-#define USE_AS_BZERO
-#define __memset_sse2_rep __bzero_sse2_rep
-#include "memset-sse2-rep.S"
diff --git a/sysdeps/i386/i686/multiarch/bzero-sse2.S b/sysdeps/i386/i686/multiarch/bzero-sse2.S
deleted file mode 100644
index 8d04512e4e..0000000000
--- a/sysdeps/i386/i686/multiarch/bzero-sse2.S
+++ /dev/null
@@ -1,3 +0,0 @@
-#define USE_AS_BZERO
-#define __memset_sse2 __bzero_sse2
-#include "memset-sse2.S"
diff --git a/sysdeps/i386/i686/multiarch/bzero.c b/sysdeps/i386/i686/multiarch/bzero.c
deleted file mode 100644
index 7fd0ddd576..0000000000
--- a/sysdeps/i386/i686/multiarch/bzero.c
+++ /dev/null
@@ -1,32 +0,0 @@
-/* Multiple versions of bzero.
-   All versions must be listed in ifunc-impl-list.c.
-   Copyright (C) 2017-2022 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 multiple versions only for the definition in libc.  */
-#if IS_IN (libc)
-# define bzero __redirect_bzero
-# include <string.h>
-# undef bzero
-
-# define SYMBOL_NAME bzero
-# include "ifunc-memset.h"
-
-libc_ifunc_redirected (__redirect_bzero, __bzero, IFUNC_SELECTOR ());
-
-weak_alias (__bzero, bzero)
-#endif
diff --git a/sysdeps/i386/i686/multiarch/ifunc-impl-list.c b/sysdeps/i386/i686/multiarch/ifunc-impl-list.c
index 5c7a42dc97..c014f52bf9 100644
--- a/sysdeps/i386/i686/multiarch/ifunc-impl-list.c
+++ b/sysdeps/i386/i686/multiarch/ifunc-impl-list.c
@@ -36,14 +36,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
   size_t i = 0;
 
-  /* Support sysdeps/i386/i686/multiarch/bzero.S.  */
-  IFUNC_IMPL (i, name, bzero,
-	      IFUNC_IMPL_ADD (array, i, bzero, CPU_FEATURE_USABLE (SSE2),
-			      __bzero_sse2_rep)
-	      IFUNC_IMPL_ADD (array, i, bzero, CPU_FEATURE_USABLE (SSE2),
-			      __bzero_sse2)
-	      IFUNC_IMPL_ADD (array, i, bzero, 1, __bzero_ia32))
-
   /* Support sysdeps/i386/i686/multiarch/memchr.S.  */
   IFUNC_IMPL (i, name, memchr,
 	      IFUNC_IMPL_ADD (array, i, memchr, CPU_FEATURE_USABLE (SSE2),
diff --git a/sysdeps/i386/i686/multiarch/memset-sse2-rep.S b/sysdeps/i386/i686/multiarch/memset-sse2-rep.S
index 37a10575e7..28df7836e0 100644
--- a/sysdeps/i386/i686/multiarch/memset-sse2-rep.S
+++ b/sysdeps/i386/i686/multiarch/memset-sse2-rep.S
@@ -32,16 +32,10 @@
 #define PUSH(REG)	pushl REG; CFI_PUSH (REG)
 #define POP(REG)	popl REG; CFI_POP (REG)
 
-#ifdef USE_AS_BZERO
-# define DEST		PARMS
-# define LEN		DEST+4
-# define SETRTNVAL
-#else
-# define DEST		PARMS
-# define CHR		DEST+4
-# define LEN		CHR+4
-# define SETRTNVAL	movl DEST(%esp), %eax
-#endif
+#define DEST		PARMS
+#define CHR		DEST+4
+#define LEN		CHR+4
+#define SETRTNVAL	movl DEST(%esp), %eax
 
 #ifdef PIC
 # define ENTRANCE	PUSH (%ebx);
@@ -78,7 +72,7 @@
 #endif
 
 	.section .text.sse2,"ax",@progbits
-#if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO
+#if defined SHARED && IS_IN (libc)
 ENTRY (__memset_chk_sse2_rep)
 	movl	12(%esp), %eax
 	cmpl	%eax, 16(%esp)
@@ -89,16 +83,12 @@ ENTRY (__memset_sse2_rep)
 	ENTRANCE
 
 	movl	LEN(%esp), %ecx
-#ifdef USE_AS_BZERO
-	xor	%eax, %eax
-#else
 	movzbl	CHR(%esp), %eax
 	movb	%al, %ah
 	/* Fill the whole EAX with pattern.  */
 	movl	%eax, %edx
 	shl	$16, %eax
 	or	%edx, %eax
-#endif
 	movl	DEST(%esp), %edx
 	cmp	$32, %ecx
 	jae	L(32bytesormore)
@@ -228,12 +218,8 @@ L(write_3bytes):
 /* ECX > 32 and EDX is 4 byte aligned.  */
 L(32bytesormore):
 	/* Fill xmm0 with the pattern.  */
-#ifdef USE_AS_BZERO
-	pxor	%xmm0, %xmm0
-#else
 	movd	%eax, %xmm0
 	pshufd	$0, %xmm0, %xmm0
-#endif
 	testl	$0xf, %edx
 	jz	L(aligned_16)
 /* ECX > 32 and EDX is not 16 byte aligned.  */
diff --git a/sysdeps/i386/i686/multiarch/memset-sse2.S b/sysdeps/i386/i686/multiarch/memset-sse2.S
index 455519c7ac..4e8414fd51 100644
--- a/sysdeps/i386/i686/multiarch/memset-sse2.S
+++ b/sysdeps/i386/i686/multiarch/memset-sse2.S
@@ -32,16 +32,10 @@
 #define PUSH(REG)	pushl REG; CFI_PUSH (REG)
 #define POP(REG)	popl REG; CFI_POP (REG)
 
-#ifdef USE_AS_BZERO
-# define DEST		PARMS
-# define LEN		DEST+4
-# define SETRTNVAL
-#else
-# define DEST		PARMS
-# define CHR		DEST+4
-# define LEN		CHR+4
-# define SETRTNVAL	movl DEST(%esp), %eax
-#endif
+#define DEST		PARMS
+#define CHR		DEST+4
+#define LEN		CHR+4
+#define SETRTNVAL	movl DEST(%esp), %eax
 
 #ifdef PIC
 # define ENTRANCE	PUSH (%ebx);
@@ -78,7 +72,7 @@
 #endif
 
 	.section .text.sse2,"ax",@progbits
-#if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO
+#if defined SHARED && IS_IN (libc)
 ENTRY (__memset_chk_sse2)
 	movl	12(%esp), %eax
 	cmpl	%eax, 16(%esp)
@@ -89,16 +83,12 @@ ENTRY (__memset_sse2)
 	ENTRANCE
 
 	movl	LEN(%esp), %ecx
-#ifdef USE_AS_BZERO
-	xor	%eax, %eax
-#else
 	movzbl	CHR(%esp), %eax
 	movb	%al, %ah
 	/* Fill the whole EAX with pattern.  */
 	movl	%eax, %edx
 	shl	$16, %eax
 	or	%edx, %eax
-#endif
 	movl	DEST(%esp), %edx
 	cmp	$32, %ecx
 	jae	L(32bytesormore)
@@ -228,12 +218,8 @@ L(write_3bytes):
 /* ECX > 32 and EDX is 4 byte aligned.  */
 L(32bytesormore):
 	/* Fill xmm0 with the pattern.  */
-#ifdef USE_AS_BZERO
-	pxor	%xmm0, %xmm0
-#else
 	movd	%eax, %xmm0
 	pshufd	$0, %xmm0, %xmm0
-#endif
 	testl	$0xf, %edx
 	jz	L(aligned_16)
 /* ECX > 32 and EDX is not 16 byte aligned.  */
diff --git a/sysdeps/i386/memset.S b/sysdeps/i386/memset.S
index f470511b64..db2753eb2f 100644
--- a/sysdeps/i386/memset.S
+++ b/sysdeps/i386/memset.S
@@ -30,15 +30,11 @@
 #define POP(REG)	popl REG; CFI_POP (REG)
 
 #define STR1  8
-#ifdef USE_AS_BZERO
-#define N     STR1+4
-#else
 #define STR2  STR1+4
 #define N     STR2+4
-#endif
 
 	.text
-#if defined SHARED && IS_IN (libc) && !defined USE_AS_BZERO
+#if defined SHARED && IS_IN (libc)
 ENTRY (__memset_chk)
 	movl	12(%esp), %eax
 	cmpl	%eax, 16(%esp)
@@ -49,20 +45,12 @@ ENTRY (memset)
 	PUSH    (%edi)
 	movl	N(%esp), %ecx
 	movl	STR1(%esp), %edi
-#ifdef USE_AS_BZERO
-	xor	%eax, %eax
-#else
 	movzbl	STR2(%esp), %eax
 	mov	%edi, %edx
-#endif
 	rep	stosb
-#ifndef USE_AS_BZERO
 	mov	%edx, %eax
-#endif
 	POP     (%edi)
 	ret
 END (memset)
 
-#ifndef USE_AS_BZERO
 libc_hidden_builtin_def (memset)
-#endif