--- /dev/null
+/* Copyright (C) 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 "../stpcpy.S"
<https://www.gnu.org/licenses/>. */
#if IS_IN (libc)
-
-# include <sysdep.h>
-# define __stpcpy __stpcpy_sse2
-
-# undef weak_alias
-# define weak_alias(ignored1, ignored2)
-# undef libc_hidden_def
-# define libc_hidden_def(__stpcpy)
-# undef libc_hidden_builtin_def
-# define libc_hidden_builtin_def(stpcpy)
+# ifndef STRCPY
+# define STRCPY __stpcpy_sse2
+# endif
#endif
#define USE_AS_STPCPY
-#include <sysdeps/x86_64/stpcpy.S>
+#include "strcpy-sse2.S"
<https://www.gnu.org/licenses/>. */
#if IS_IN (libc)
+# ifndef STRCPY
+# define STRCPY __strcpy_sse2
+# endif
+#endif
-# include <sysdep.h>
-# define strcpy __strcpy_sse2
+#include <sysdep.h>
-# undef libc_hidden_builtin_def
-# define libc_hidden_builtin_def(strcpy)
-#endif
+ .text
+ENTRY (STRCPY)
+ movq %rsi, %rcx /* Source register. */
+ andl $7, %ecx /* mask alignment bits */
+ movq %rdi, %rdx /* Duplicate destination pointer. */
+
+ jz 5f /* aligned => start loop */
+
+ neg %ecx /* We need to align to 8 bytes. */
+ addl $8,%ecx
+ /* Search the first bytes directly. */
+0:
+ movb (%rsi), %al /* Fetch a byte */
+ testb %al, %al /* Is it NUL? */
+ movb %al, (%rdx) /* Store it */
+ jz 4f /* If it was NUL, done! */
+ incq %rsi
+ incq %rdx
+ decl %ecx
+ jnz 0b
+
+5:
+ movq $0xfefefefefefefeff,%r8
+
+ /* Now the sources is aligned. Unfortunatly we cannot force
+ to have both source and destination aligned, so ignore the
+ alignment of the destination. */
+ .p2align 4
+1:
+ /* 1st unroll. */
+ movq (%rsi), %rax /* Read double word (8 bytes). */
+ addq $8, %rsi /* Adjust pointer for next word. */
+ movq %rax, %r9 /* Save a copy for NUL finding. */
+ addq %r8, %r9 /* add the magic value to the word. We get
+ carry bits reported for each byte which
+ is *not* 0 */
+ jnc 3f /* highest byte is NUL => return pointer */
+ xorq %rax, %r9 /* (word+magic)^word */
+ orq %r8, %r9 /* set all non-carry bits */
+ incq %r9 /* add 1: if one carry bit was *not* set
+ the addition will not result in 0. */
+
+ jnz 3f /* found NUL => return pointer */
+
+ movq %rax, (%rdx) /* Write value to destination. */
+ addq $8, %rdx /* Adjust pointer. */
+
+ /* 2nd unroll. */
+ movq (%rsi), %rax /* Read double word (8 bytes). */
+ addq $8, %rsi /* Adjust pointer for next word. */
+ movq %rax, %r9 /* Save a copy for NUL finding. */
+ addq %r8, %r9 /* add the magic value to the word. We get
+ carry bits reported for each byte which
+ is *not* 0 */
+ jnc 3f /* highest byte is NUL => return pointer */
+ xorq %rax, %r9 /* (word+magic)^word */
+ orq %r8, %r9 /* set all non-carry bits */
+ incq %r9 /* add 1: if one carry bit was *not* set
+ the addition will not result in 0. */
+
+ jnz 3f /* found NUL => return pointer */
-#include <sysdeps/x86_64/strcpy.S>
+ movq %rax, (%rdx) /* Write value to destination. */
+ addq $8, %rdx /* Adjust pointer. */
+
+ /* 3rd unroll. */
+ movq (%rsi), %rax /* Read double word (8 bytes). */
+ addq $8, %rsi /* Adjust pointer for next word. */
+ movq %rax, %r9 /* Save a copy for NUL finding. */
+ addq %r8, %r9 /* add the magic value to the word. We get
+ carry bits reported for each byte which
+ is *not* 0 */
+ jnc 3f /* highest byte is NUL => return pointer */
+ xorq %rax, %r9 /* (word+magic)^word */
+ orq %r8, %r9 /* set all non-carry bits */
+ incq %r9 /* add 1: if one carry bit was *not* set
+ the addition will not result in 0. */
+
+ jnz 3f /* found NUL => return pointer */
+
+ movq %rax, (%rdx) /* Write value to destination. */
+ addq $8, %rdx /* Adjust pointer. */
+
+ /* 4th unroll. */
+ movq (%rsi), %rax /* Read double word (8 bytes). */
+ addq $8, %rsi /* Adjust pointer for next word. */
+ movq %rax, %r9 /* Save a copy for NUL finding. */
+ addq %r8, %r9 /* add the magic value to the word. We get
+ carry bits reported for each byte which
+ is *not* 0 */
+ jnc 3f /* highest byte is NUL => return pointer */
+ xorq %rax, %r9 /* (word+magic)^word */
+ orq %r8, %r9 /* set all non-carry bits */
+ incq %r9 /* add 1: if one carry bit was *not* set
+ the addition will not result in 0. */
+
+ jnz 3f /* found NUL => return pointer */
+
+ movq %rax, (%rdx) /* Write value to destination. */
+ addq $8, %rdx /* Adjust pointer. */
+ jmp 1b /* Next iteration. */
+
+ /* Do the last few bytes. %rax contains the value to write.
+ The loop is unrolled twice. */
+ .p2align 4
+3:
+ /* Note that stpcpy needs to return with the value of the NUL
+ byte. */
+ movb %al, (%rdx) /* 1st byte. */
+ testb %al, %al /* Is it NUL. */
+ jz 4f /* yes, finish. */
+ incq %rdx /* Increment destination. */
+ movb %ah, (%rdx) /* 2nd byte. */
+ testb %ah, %ah /* Is it NUL?. */
+ jz 4f /* yes, finish. */
+ incq %rdx /* Increment destination. */
+ shrq $16, %rax /* Shift... */
+ jmp 3b /* and look at next two bytes in %rax. */
+
+4:
+#ifdef USE_AS_STPCPY
+ movq %rdx, %rax /* Destination is return value. */
+#else
+ movq %rdi, %rax /* Source is return value. */
+#endif
+ retq
+END (STRCPY)
-#define USE_AS_STPCPY
#define STRCPY __stpcpy
-#include <sysdeps/x86_64/strcpy.S>
+#include "multiarch/stpcpy-sse2.S"
weak_alias (__stpcpy, stpcpy)
libc_hidden_def (__stpcpy)
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-#include <sysdep.h>
-#include "asm-syntax.h"
-
-#ifndef USE_AS_STPCPY
-# define STRCPY strcpy
-#endif
-
- .text
-ENTRY (STRCPY)
- movq %rsi, %rcx /* Source register. */
- andl $7, %ecx /* mask alignment bits */
- movq %rdi, %rdx /* Duplicate destination pointer. */
-
- jz 5f /* aligned => start loop */
-
- neg %ecx /* We need to align to 8 bytes. */
- addl $8,%ecx
- /* Search the first bytes directly. */
-0:
- movb (%rsi), %al /* Fetch a byte */
- testb %al, %al /* Is it NUL? */
- movb %al, (%rdx) /* Store it */
- jz 4f /* If it was NUL, done! */
- incq %rsi
- incq %rdx
- decl %ecx
- jnz 0b
-
-5:
- movq $0xfefefefefefefeff,%r8
-
- /* Now the sources is aligned. Unfortunatly we cannot force
- to have both source and destination aligned, so ignore the
- alignment of the destination. */
- .p2align 4
-1:
- /* 1st unroll. */
- movq (%rsi), %rax /* Read double word (8 bytes). */
- addq $8, %rsi /* Adjust pointer for next word. */
- movq %rax, %r9 /* Save a copy for NUL finding. */
- addq %r8, %r9 /* add the magic value to the word. We get
- carry bits reported for each byte which
- is *not* 0 */
- jnc 3f /* highest byte is NUL => return pointer */
- xorq %rax, %r9 /* (word+magic)^word */
- orq %r8, %r9 /* set all non-carry bits */
- incq %r9 /* add 1: if one carry bit was *not* set
- the addition will not result in 0. */
-
- jnz 3f /* found NUL => return pointer */
-
- movq %rax, (%rdx) /* Write value to destination. */
- addq $8, %rdx /* Adjust pointer. */
-
- /* 2nd unroll. */
- movq (%rsi), %rax /* Read double word (8 bytes). */
- addq $8, %rsi /* Adjust pointer for next word. */
- movq %rax, %r9 /* Save a copy for NUL finding. */
- addq %r8, %r9 /* add the magic value to the word. We get
- carry bits reported for each byte which
- is *not* 0 */
- jnc 3f /* highest byte is NUL => return pointer */
- xorq %rax, %r9 /* (word+magic)^word */
- orq %r8, %r9 /* set all non-carry bits */
- incq %r9 /* add 1: if one carry bit was *not* set
- the addition will not result in 0. */
-
- jnz 3f /* found NUL => return pointer */
-
- movq %rax, (%rdx) /* Write value to destination. */
- addq $8, %rdx /* Adjust pointer. */
-
- /* 3rd unroll. */
- movq (%rsi), %rax /* Read double word (8 bytes). */
- addq $8, %rsi /* Adjust pointer for next word. */
- movq %rax, %r9 /* Save a copy for NUL finding. */
- addq %r8, %r9 /* add the magic value to the word. We get
- carry bits reported for each byte which
- is *not* 0 */
- jnc 3f /* highest byte is NUL => return pointer */
- xorq %rax, %r9 /* (word+magic)^word */
- orq %r8, %r9 /* set all non-carry bits */
- incq %r9 /* add 1: if one carry bit was *not* set
- the addition will not result in 0. */
-
- jnz 3f /* found NUL => return pointer */
-
- movq %rax, (%rdx) /* Write value to destination. */
- addq $8, %rdx /* Adjust pointer. */
-
- /* 4th unroll. */
- movq (%rsi), %rax /* Read double word (8 bytes). */
- addq $8, %rsi /* Adjust pointer for next word. */
- movq %rax, %r9 /* Save a copy for NUL finding. */
- addq %r8, %r9 /* add the magic value to the word. We get
- carry bits reported for each byte which
- is *not* 0 */
- jnc 3f /* highest byte is NUL => return pointer */
- xorq %rax, %r9 /* (word+magic)^word */
- orq %r8, %r9 /* set all non-carry bits */
- incq %r9 /* add 1: if one carry bit was *not* set
- the addition will not result in 0. */
-
- jnz 3f /* found NUL => return pointer */
-
- movq %rax, (%rdx) /* Write value to destination. */
- addq $8, %rdx /* Adjust pointer. */
- jmp 1b /* Next iteration. */
-
- /* Do the last few bytes. %rax contains the value to write.
- The loop is unrolled twice. */
- .p2align 4
-3:
- /* Note that stpcpy needs to return with the value of the NUL
- byte. */
- movb %al, (%rdx) /* 1st byte. */
- testb %al, %al /* Is it NUL. */
- jz 4f /* yes, finish. */
- incq %rdx /* Increment destination. */
- movb %ah, (%rdx) /* 2nd byte. */
- testb %ah, %ah /* Is it NUL?. */
- jz 4f /* yes, finish. */
- incq %rdx /* Increment destination. */
- shrq $16, %rax /* Shift... */
- jmp 3b /* and look at next two bytes in %rax. */
-
-4:
-#ifdef USE_AS_STPCPY
- movq %rdx, %rax /* Destination is return value. */
-#else
- movq %rdi, %rax /* Source is return value. */
-#endif
- retq
-END (STRCPY)
-#ifndef USE_AS_STPCPY
+#define STRCPY strcpy
+#include "multiarch/strcpy-sse2.S"
libc_hidden_builtin_def (strcpy)
-#endif
projects / thirdparty / glibc.git / commitdiff
