+2010-08-25 H.J. Lu <hongjiu.lu@intel.com>
+
+ * sysdeps/i386/i686/multiarch/Makefile (sysdep_routines): Add
+ strlen-sse2 strlen-sse2-bsf.
+ * sysdeps/i386/i686/multiarch/strlen.S (strlen): Return
+ __strlen_sse2_bsf if bit_Slow_BSF is unset.
+ (__strlen_sse2): Removed.
+ * sysdeps/i386/i686/multiarch/strlen-sse2-bsf.S: New file.
+ * sysdeps/i386/i686/multiarch/strlen-sse2.S: New file.
+ * sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features): Set
+ bit_Slow_BSF for Atom.
+ * sysdeps/x86_64/multiarch/init-arch.h (bit_Slow_BSF): Define.
+ (index_Slow_BSF): Define.
+ (HAS_SLOW_BSF): Define.
+
2010-08-25 Ulrich Drepper <drepper@redhat.com>
[BZ #10851]
memmove-ssse3-rep bcopy-ssse3 bcopy-ssse3-rep \
memset-sse2-rep bzero-sse2-rep strcmp-ssse3 \
strcmp-sse4 strncmp-c strncmp-ssse3 strncmp-sse4 \
- memcmp-ssse3 memcmp-sse4 strcasestr-nonascii varshift
+ memcmp-ssse3 memcmp-sse4 strcasestr-nonascii varshift \
+ strlen-sse2 strlen-sse2-bsf
ifeq (yes,$(config-cflags-sse4))
sysdep_routines += strcspn-c strpbrk-c strspn-c strstr-c strcasestr-c
CFLAGS-strcspn-c.c += -msse4
--- /dev/null
+/* strlen with SSE2 and BSF
+ Copyright (C) 2010 Free Software Foundation, Inc.
+ Contributed by Intel Corporation.
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#if defined SHARED && !defined NOT_IN_libc
+
+#include <sysdep.h>
+#include "asm-syntax.h"
+
+#define CFI_PUSH(REG) \
+ cfi_adjust_cfa_offset (4); \
+ cfi_rel_offset (REG, 0)
+
+#define CFI_POP(REG) \
+ cfi_adjust_cfa_offset (-4); \
+ cfi_restore (REG)
+
+#define PUSH(REG) pushl REG; CFI_PUSH (REG)
+#define POP(REG) popl REG; CFI_POP (REG)
+#define PARMS 4 + 8 /* Preserve ESI and EDI. */
+#define STR PARMS
+#define ENTRANCE PUSH (%esi); PUSH (%edi); cfi_remember_state
+#define RETURN POP (%edi); POP (%esi); ret; \
+ cfi_restore_state; cfi_remember_state
+
+ .text
+ENTRY ( __strlen_sse2_bsf)
+ ENTRANCE
+ mov STR(%esp), %edi
+ xor %eax, %eax
+ mov %edi, %ecx
+ and $0x3f, %ecx
+ pxor %xmm0, %xmm0
+ cmp $0x30, %ecx
+ ja L(next)
+ movdqu (%edi), %xmm1
+ pcmpeqb %xmm1, %xmm0
+ pmovmskb %xmm0, %edx
+ test %edx, %edx
+ jnz L(exit_less16)
+ mov %edi, %eax
+ and $-16, %eax
+ jmp L(align16_start)
+L(next):
+
+ mov %edi, %eax
+ and $-16, %eax
+ pcmpeqb (%eax), %xmm0
+ mov $-1, %esi
+ sub %eax, %ecx
+ shl %cl, %esi
+ pmovmskb %xmm0, %edx
+ and %esi, %edx
+ jnz L(exit)
+L(align16_start):
+ pxor %xmm0, %xmm0
+ pxor %xmm1, %xmm1
+ pxor %xmm2, %xmm2
+ pxor %xmm3, %xmm3
+ .p2align 4
+L(align16_loop):
+ pcmpeqb 16(%eax), %xmm0
+ pmovmskb %xmm0, %edx
+ test %edx, %edx
+ jnz L(exit16)
+
+ pcmpeqb 32(%eax), %xmm1
+ pmovmskb %xmm1, %edx
+ test %edx, %edx
+ jnz L(exit32)
+
+ pcmpeqb 48(%eax), %xmm2
+ pmovmskb %xmm2, %edx
+ test %edx, %edx
+ jnz L(exit48)
+
+ pcmpeqb 64(%eax), %xmm3
+ pmovmskb %xmm3, %edx
+ lea 64(%eax), %eax
+ test %edx, %edx
+ jz L(align16_loop)
+L(exit):
+ sub %edi, %eax
+L(exit_less16):
+ bsf %edx, %edx
+ add %edx, %eax
+ RETURN
+L(exit16):
+ sub %edi, %eax
+ bsf %edx, %edx
+ add %edx, %eax
+ add $16, %eax
+ RETURN
+L(exit32):
+ sub %edi, %eax
+ bsf %edx, %edx
+ add %edx, %eax
+ add $32, %eax
+ RETURN
+L(exit48):
+ sub %edi, %eax
+ bsf %edx, %edx
+ add %edx, %eax
+ add $48, %eax
+ POP (%edi)
+ POP (%esi)
+ ret
+
+END ( __strlen_sse2_bsf)
+
+#endif
--- /dev/null
+/* strlen with SSE2
+ Copyright (C) 2010 Free Software Foundation, Inc.
+ Contributed by Intel Corporation.
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#if defined SHARED && !defined NOT_IN_libc
+
+#include <sysdep.h>
+#include "asm-syntax.h"
+
+#define CFI_PUSH(REG) \
+ cfi_adjust_cfa_offset (4); \
+ cfi_rel_offset (REG, 0)
+
+#define CFI_POP(REG) \
+ cfi_adjust_cfa_offset (-4); \
+ cfi_restore (REG)
+
+#define PUSH(REG) pushl REG; CFI_PUSH (REG)
+#define POP(REG) popl REG; CFI_POP (REG)
+#define PARMS 4
+#define STR PARMS
+#define ENTRANCE
+#define RETURN ret
+
+ .text
+ENTRY (__strlen_sse2)
+ ENTRANCE
+ mov STR(%esp), %edx
+ xor %eax, %eax
+ cmpb $0, (%edx)
+ jz L(exit_tail0)
+ cmpb $0, 1(%edx)
+ jz L(exit_tail1)
+ cmpb $0, 2(%edx)
+ jz L(exit_tail2)
+ cmpb $0, 3(%edx)
+ jz L(exit_tail3)
+ cmpb $0, 4(%edx)
+ jz L(exit_tail4)
+ cmpb $0, 5(%edx)
+ jz L(exit_tail5)
+ cmpb $0, 6(%edx)
+ jz L(exit_tail6)
+ cmpb $0, 7(%edx)
+ jz L(exit_tail7)
+ cmpb $0, 8(%edx)
+ jz L(exit_tail8)
+ cmpb $0, 9(%edx)
+ jz L(exit_tail9)
+ cmpb $0, 10(%edx)
+ jz L(exit_tail10)
+ cmpb $0, 11(%edx)
+ jz L(exit_tail11)
+ cmpb $0, 12(%edx)
+ jz L(exit_tail12)
+ cmpb $0, 13(%edx)
+ jz L(exit_tail13)
+ cmpb $0, 14(%edx)
+ jz L(exit_tail14)
+ cmpb $0, 15(%edx)
+ jz L(exit_tail15)
+ pxor %xmm0, %xmm0
+ mov %edx, %eax
+ mov %edx, %ecx
+ and $-16, %eax
+ add $16, %ecx
+ add $16, %eax
+
+ pcmpeqb (%eax), %xmm0
+ pmovmskb %xmm0, %edx
+ pxor %xmm1, %xmm1
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm1
+ pmovmskb %xmm1, %edx
+ pxor %xmm2, %xmm2
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+
+ pcmpeqb (%eax), %xmm2
+ pmovmskb %xmm2, %edx
+ pxor %xmm3, %xmm3
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm3
+ pmovmskb %xmm3, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm0
+ pmovmskb %xmm0, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm1
+ pmovmskb %xmm1, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm2
+ pmovmskb %xmm2, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm3
+ pmovmskb %xmm3, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm0
+ pmovmskb %xmm0, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm1
+ pmovmskb %xmm1, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm2
+ pmovmskb %xmm2, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm3
+ pmovmskb %xmm3, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm0
+ pmovmskb %xmm0, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm1
+ pmovmskb %xmm1, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm2
+ pmovmskb %xmm2, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqb (%eax), %xmm3
+ pmovmskb %xmm3, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ and $-0x40, %eax
+ PUSH (%esi)
+ PUSH (%edi)
+ PUSH (%ebx)
+ PUSH (%ebp)
+ xor %ebp, %ebp
+L(aligned_64):
+ pcmpeqb (%eax), %xmm0
+ pcmpeqb 16(%eax), %xmm1
+ pcmpeqb 32(%eax), %xmm2
+ pcmpeqb 48(%eax), %xmm3
+ pmovmskb %xmm0, %edx
+ pmovmskb %xmm1, %esi
+ pmovmskb %xmm2, %edi
+ pmovmskb %xmm3, %ebx
+ or %edx, %ebp
+ or %esi, %ebp
+ or %edi, %ebp
+ or %ebx, %ebp
+ lea 64(%eax), %eax
+ jz L(aligned_64)
+L(48leave):
+ test %edx, %edx
+ jnz L(aligned_64_exit_16)
+ test %esi, %esi
+ jnz L(aligned_64_exit_32)
+ test %edi, %edi
+ jnz L(aligned_64_exit_48)
+ mov %ebx, %edx
+ lea (%eax), %eax
+ jmp L(aligned_64_exit)
+L(aligned_64_exit_48):
+ lea -16(%eax), %eax
+ mov %edi, %edx
+ jmp L(aligned_64_exit)
+L(aligned_64_exit_32):
+ lea -32(%eax), %eax
+ mov %esi, %edx
+ jmp L(aligned_64_exit)
+L(aligned_64_exit_16):
+ lea -48(%eax), %eax
+L(aligned_64_exit):
+ POP (%ebp)
+ POP (%ebx)
+ POP (%edi)
+ POP (%esi)
+L(exit):
+ sub %ecx, %eax
+ test %dl, %dl
+ jz L(exit_high)
+ test $0x01, %dl
+ jnz L(exit_tail0)
+
+ test $0x02, %dl
+ jnz L(exit_tail1)
+
+ test $0x04, %dl
+ jnz L(exit_tail2)
+
+ test $0x08, %dl
+ jnz L(exit_tail3)
+
+ test $0x10, %dl
+ jnz L(exit_tail4)
+
+ test $0x20, %dl
+ jnz L(exit_tail5)
+
+ test $0x40, %dl
+ jnz L(exit_tail6)
+ add $7, %eax
+L(exit_tail0):
+ RETURN
+
+L(exit_high):
+ add $8, %eax
+ test $0x01, %dh
+ jnz L(exit_tail0)
+
+ test $0x02, %dh
+ jnz L(exit_tail1)
+
+ test $0x04, %dh
+ jnz L(exit_tail2)
+
+ test $0x08, %dh
+ jnz L(exit_tail3)
+
+ test $0x10, %dh
+ jnz L(exit_tail4)
+
+ test $0x20, %dh
+ jnz L(exit_tail5)
+
+ test $0x40, %dh
+ jnz L(exit_tail6)
+ add $7, %eax
+ RETURN
+
+ .p2align 4
+L(exit_tail1):
+ add $1, %eax
+ RETURN
+
+L(exit_tail2):
+ add $2, %eax
+ RETURN
+
+L(exit_tail3):
+ add $3, %eax
+ RETURN
+
+L(exit_tail4):
+ add $4, %eax
+ RETURN
+
+L(exit_tail5):
+ add $5, %eax
+ RETURN
+
+L(exit_tail6):
+ add $6, %eax
+ RETURN
+
+L(exit_tail7):
+ add $7, %eax
+ RETURN
+
+L(exit_tail8):
+ add $8, %eax
+ RETURN
+
+L(exit_tail9):
+ add $9, %eax
+ RETURN
+
+L(exit_tail10):
+ add $10, %eax
+ RETURN
+
+L(exit_tail11):
+ add $11, %eax
+ RETURN
+
+L(exit_tail12):
+ add $12, %eax
+ RETURN
+
+L(exit_tail13):
+ add $13, %eax
+ RETURN
+
+L(exit_tail14):
+ add $14, %eax
+ RETURN
+
+L(exit_tail15):
+ add $15, %eax
+ ret
+
+END (__strlen_sse2)
+
+#endif
/* Multiple versions of strlen
- Copyright (C) 2009 Free Software Foundation, Inc.
+ Copyright (C) 2009, 2010 Free Software Foundation, Inc.
Contributed by Intel Corporation.
This file is part of the GNU C Library.
1: leal __strlen_ia32@GOTOFF(%ebx), %eax
testl $bit_SSE2, CPUID_OFFSET+index_SSE2+__cpu_features@GOTOFF(%ebx)
jz 2f
+ leal __strlen_sse2_bsf@GOTOFF(%ebx), %eax
+ testl $bit_Slow_BSF, FEATURE_OFFSET+index_Slow_BSF+__cpu_features@GOTOFF(%ebx)
+ jz 2f
leal __strlen_sse2@GOTOFF(%ebx), %eax
2: popl %ebx
cfi_adjust_cfa_offset (-4);
ret
END(strlen)
-#define CFI_POP(REG) \
- cfi_adjust_cfa_offset (-4); \
- cfi_restore (REG)
-
-#define RETURN popl %esi; CFI_POP (esi); ret
-
- .text
-ENTRY (__strlen_sse2)
-/*
- * This implementation uses SSE instructions to compare up to 16 bytes
- * at a time looking for the end of string (null char).
- */
- pushl %esi
- cfi_adjust_cfa_offset (4)
- cfi_rel_offset (%esi, 0)
- mov 8(%esp), %eax
- mov %eax, %ecx
- pxor %xmm0, %xmm0 /* 16 null chars */
- mov %eax, %esi
- and $15, %ecx
- jz 1f /* string is 16 byte aligned */
-
- /*
- * Unaligned case. Round down to 16-byte boundary before comparing
- * 16 bytes for a null char. The code then compensates for any extra chars
- * preceding the start of the string.
- */
- and $-16, %esi
-
- pcmpeqb (%esi), %xmm0
- lea 16(%eax), %esi
- pmovmskb %xmm0, %edx
-
- shr %cl, %edx /* Compensate for bytes preceding the string */
- test %edx, %edx
- jnz 2f
- sub %ecx, %esi /* no null, adjust to next 16-byte boundary */
- pxor %xmm0, %xmm0 /* clear xmm0, may have been changed... */
-
- .p2align 4
-1: /* 16 byte aligned */
- pcmpeqb (%esi), %xmm0 /* look for null bytes */
- pmovmskb %xmm0, %edx /* move each byte mask of %xmm0 to edx */
-
- add $16, %esi /* prepare to search next 16 bytes */
- test %edx, %edx /* if no null byte, %edx must be 0 */
- jnz 2f /* found a null */
-
- pcmpeqb (%esi), %xmm0
- pmovmskb %xmm0, %edx
- add $16, %esi
- test %edx, %edx
- jnz 2f
-
- pcmpeqb (%esi), %xmm0
- pmovmskb %xmm0, %edx
- add $16, %esi
- test %edx, %edx
- jnz 2f
-
- pcmpeqb (%esi), %xmm0
- pmovmskb %xmm0, %edx
- add $16, %esi
- test %edx, %edx
- jz 1b
-
-2:
- neg %eax
- lea -16(%eax, %esi), %eax /* calculate exact offset */
- bsf %edx, %ecx /* Least significant 1 bit is index of null */
- add %ecx, %eax
- popl %esi
- cfi_adjust_cfa_offset (-4)
- cfi_restore (%esi)
- ret
-
-END (__strlen_sse2)
-
# undef ENTRY
# define ENTRY(name) \
.type __strlen_ia32, @function; \
model += extended_model;
switch (model)
{
+ case 0x1c:
+ case 0x26:
+ /* BSF is slow on Atom. */
+ __cpu_features.feature[index_Slow_BSF] |= bit_Slow_BSF;
+ break;
+
case 0x1a:
case 0x1e:
case 0x1f:
#define bit_Fast_Rep_String (1 << 0)
#define bit_Fast_Copy_Backward (1 << 1)
+#define bit_Slow_BSF (1 << 2)
#ifdef __ASSEMBLER__
# define index_Fast_Rep_String FEATURE_INDEX_1*FEATURE_SIZE
# define index_Fast_Copy_Backward FEATURE_INDEX_1*FEATURE_SIZE
+# define index_Slow_BSF FEATURE_INDEX_1*FEATURE_SIZE
#else /* __ASSEMBLER__ */
# define index_Fast_Rep_String FEATURE_INDEX_1
# define index_Fast_Copy_Backward FEATURE_INDEX_1
+# define index_Slow_BSF FEATURE_INDEX_1
#define HAS_ARCH_FEATURE(idx, bit) \
((__get_cpu_features ()->feature[idx] & (bit)) != 0)
#define HAS_FAST_COPY_BACKWARD \
HAS_ARCH_FEATURE (index_Fast_Copy_Backward, bit_Fast_Copy_Backward)
+#define HAS_SLOW_BSF \
+ HAS_ARCH_FEATURE (index_Slow_BSF, bit_Slow_BSF)
+
#endif /* __ASSEMBLER__ */
git://sourceware.org / glibc.git / commitdiff