@@ -19,340 +19,201 @@
#include <sysdep.h>
- .text
-ENTRY (memcmp)
- test %rdx, %rdx
- jz L(finz)
- cmpq $1, %rdx
- jle L(finr1b)
- subq %rdi, %rsi
- movq %rdx, %r10
- cmpq $32, %r10
- jge L(gt32)
- /* Handle small chunks and last block of less than 32 bytes. */
-L(small):
- testq $1, %r10
- jz L(s2b)
- movzbl (%rdi), %eax
- movzbl (%rdi, %rsi), %edx
- subq $1, %r10
- je L(finz1)
- addq $1, %rdi
- subl %edx, %eax
- jnz L(exit)
-L(s2b):
- testq $2, %r10
- jz L(s4b)
- movzwl (%rdi), %eax
- movzwl (%rdi, %rsi), %edx
- subq $2, %r10
- je L(fin2_7)
- addq $2, %rdi
- cmpl %edx, %eax
- jnz L(fin2_7)
-L(s4b):
- testq $4, %r10
- jz L(s8b)
- movl (%rdi), %eax
- movl (%rdi, %rsi), %edx
- subq $4, %r10
- je L(fin2_7)
- addq $4, %rdi
- cmpl %edx, %eax
- jnz L(fin2_7)
-L(s8b):
- testq $8, %r10
- jz L(s16b)
- movq (%rdi), %rax
- movq (%rdi, %rsi), %rdx
- subq $8, %r10
- je L(fin2_7)
- addq $8, %rdi
- cmpq %rdx, %rax
- jnz L(fin2_7)
-L(s16b):
- movdqu (%rdi), %xmm1
- movdqu (%rdi, %rsi), %xmm0
- pcmpeqb %xmm0, %xmm1
- pmovmskb %xmm1, %edx
- xorl %eax, %eax
- subl $0xffff, %edx
- jz L(finz)
- bsfl %edx, %ecx
- leaq (%rdi, %rcx), %rcx
- movzbl (%rcx), %eax
- movzbl (%rsi, %rcx), %edx
- jmp L(finz1)
+#ifndef MEMCMP
+# define MEMCMP memcmp
+#endif
- .p2align 4,, 4
-L(finr1b):
- movzbl (%rdi), %eax
- movzbl (%rsi), %edx
-L(finz1):
- subl %edx, %eax
-L(exit):
+ .text
+ENTRY (MEMCMP)
+ testq %rdx, %rdx
+ je L(return_zero)
+ pxor %xmm4, %xmm4
+ movl %edi, %eax
+ andl $4095, %eax
+ cmpl $4032, %eax
+ jg L(cross_page)
+L(handle_end):
+ movl %esi, %eax
+ andl $4095, %eax
+ cmpl $4032, %eax
+ jg L(cross_page)
+ movdqu (%rdi), %xmm0
+ lea -1(%edx), %ecx
+ movl $2, %eax
+ movdqu (%rsi), %xmm1
+ salq %cl, %rax
+ leaq -1(%rax), %rcx
+ pcmpeqb %xmm1, %xmm0
+ pcmpeqb %xmm4, %xmm0
+ pmovmskb %xmm0, %eax
+ and %ecx, %eax
+ jne L(different)
+ cmpq $16, %rdx
+ jbe L(return_zero)
+ pmovmskb %xmm0, %r8d
+ movdqu 16(%rdi), %xmm2
+ movdqu 16(%rsi), %xmm6
+ movdqu 32(%rdi), %xmm1
+ pcmpeqb %xmm6, %xmm2
+ movdqu 32(%rsi), %xmm5
+ pcmpeqb %xmm4, %xmm2
+ pcmpeqb %xmm5, %xmm1
+ movdqu 48(%rdi), %xmm7
+ pmovmskb %xmm2, %eax
+ movdqu 48(%rsi), %xmm3
+ pcmpeqb %xmm4, %xmm1
+ pmovmskb %xmm1, %r9d
+ sal $16, %eax
+ pcmpeqb %xmm3, %xmm7
+ salq $32, %r9
+ pcmpeqb %xmm4, %xmm7
+ orq %r9, %rax
+ orq %r8, %rax
+ pmovmskb %xmm7, %r8d
+ salq $48, %r8
+ orq %r8, %rax
+ movq %rax, %r8
+ andq %rcx, %rax
+ jne L(different)
+ cmpq $64, %rdx
+ jbe L(return_zero)
+ movq %r8, %rax
+ testq %rax, %rax
+ jne L(different)
+L(align_loop):
+#ifdef USE_AVX2
+ vpxor %xmm4, %xmm4, %xmm4
+#endif
+ leaq 64(%rdi), %rax
+ andq $-64, %rax
+ subq %rdi, %rax
+ subq %rax, %rdx
+ addq %rax, %rdi
+ addq %rax, %rsi
+ cmpq $64, %rdx
+ ja L(loop_start)
+ testq %rdx, %rdx
+ jne L(handle_end)
+ xorl %eax, %eax
ret
- .p2align 4,, 4
-L(fin2_7):
- cmpq %rdx, %rax
- jz L(finz)
- movq %rax, %r11
- subq %rdx, %r11
- bsfq %r11, %rcx
- sarq $3, %rcx
- salq $3, %rcx
- sarq %cl, %rax
- movzbl %al, %eax
- sarq %cl, %rdx
- movzbl %dl, %edx
+ .p2align 4
+L(different):
+ bsfq %rax, %rdx
+ movzbl (%rdi,%rdx), %eax
+ movzbl (%rsi,%rdx), %edx
subl %edx, %eax
ret
- .p2align 4,, 4
-L(finz):
+#ifdef USE_AVX2
+L(loop):
+ subq $64, %rdx
+ addq $64, %rdi
+ addq $64, %rsi
+ cmpq $64, %rdx
+ jbe L(less_64_bytes)
+L(loop_start):
+ vmovdqu (%rsi), %ymm0
+ vpcmpeqb (%rdi), %ymm0, %ymm0
+ vmovdqu 32(%rsi), %ymm1
+ vpcmpeqb 32(%rdi), %ymm1, %ymm1
+ vpminub %ymm0, %ymm1, %ymm1
+ vpcmpeqb %ymm1, %ymm4, %ymm1
+ vpmovmskb %ymm1, %eax
+ testl %eax, %eax
+ je L(loop)
+ shl $32, %rax
+ vpcmpeqb %ymm4, %ymm0, %ymm0
+ vpmovmskb %ymm0, %ecx
+ or %rcx, %rax
+ vzeroupper
+ jmp L(different)
+
+L(less_64_bytes):
+ vzeroupper
+ testq %rdx, %rdx
+ jne L(handle_end)
xorl %eax, %eax
ret
+#else
+ .p2align 4
+L(loop):
+ subq $64, %rdx
+ addq $64, %rdi
+ addq $64, %rsi
+ cmpq $64, %rdx
+ jbe L(less_64_bytes)
+L(loop_start):
+ movdqu (%rsi), %xmm0
+ movdqu 16(%rsi), %xmm1
+ pcmpeqb (%rdi), %xmm0
+ movdqu 32(%rsi), %xmm2
+ pcmpeqb 16(%rdi), %xmm1
+ movdqu 48(%rsi), %xmm3
+ pcmpeqb 32(%rdi), %xmm2
+ pcmpeqb 48(%rdi), %xmm3
+ pminub %xmm0, %xmm3
+ pminub %xmm1, %xmm3
+ pminub %xmm2, %xmm3
+ pcmpeqb %xmm4, %xmm3
+ pmovmskb %xmm3, %eax
+ testl %eax, %eax
+ je L(loop)
+ shl $48, %rax
+ pcmpeqb %xmm4, %xmm0
+ pcmpeqb %xmm4, %xmm1
+ pcmpeqb %xmm4, %xmm2
+ pmovmskb %xmm0, %r8
+ pmovmskb %xmm1, %rcx
+ pmovmskb %xmm2, %r9
+ shl $16, %ecx
+ shl $32, %r9
+ or %r8, %rax
+ or %r9, %rax
+ or %rcx, %rax
+ jmp L(different)
+
+ .p2align 4
+L(less_64_bytes):
+ testq %rdx, %rdx
+ jne L(handle_end)
+ xorl %eax, %eax
+ ret
+#endif
- /* For blocks bigger than 32 bytes
- 1. Advance one of the addr pointer to be 16B aligned.
- 2. Treat the case of both addr pointers aligned to 16B
- separately to avoid movdqu.
- 3. Handle any blocks of greater than 64 consecutive bytes with
- unrolling to reduce branches.
- 4. At least one addr pointer is 16B aligned, use memory version
- of pcmbeqb.
- */
- .p2align 4,, 4
-L(gt32):
- movq %rdx, %r11
- addq %rdi, %r11
- movq %rdi, %r8
-
- andq $15, %r8
- jz L(16am)
- /* Both pointers may be misaligned. */
- movdqu (%rdi), %xmm1
- movdqu (%rdi, %rsi), %xmm0
- pcmpeqb %xmm0, %xmm1
- pmovmskb %xmm1, %edx
- subl $0xffff, %edx
- jnz L(neq)
- neg %r8
- leaq 16(%rdi, %r8), %rdi
-L(16am):
- /* Handle two 16B aligned pointers separately. */
- testq $15, %rsi
- jz L(ATR)
- testq $16, %rdi
- jz L(A32)
- movdqu (%rdi, %rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-L(A32):
- movq %r11, %r10
- andq $-32, %r10
- cmpq %r10, %rdi
- jge L(mt16)
- /* Pre-unroll to be ready for unrolled 64B loop. */
- testq $32, %rdi
- jz L(A64)
- movdqu (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- movdqu (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
-L(A64):
- movq %r11, %r10
- andq $-64, %r10
- cmpq %r10, %rdi
- jge L(mt32)
-
-L(A64main):
- movdqu (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- movdqu (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- movdqu (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- movdqu (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- cmpq %rdi, %r10
- jne L(A64main)
-
-L(mt32):
- movq %r11, %r10
- andq $-32, %r10
- cmpq %r10, %rdi
- jge L(mt16)
-
-L(A32main):
- movdqu (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- movdqu (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- cmpq %rdi, %r10
- jne L(A32main)
-L(mt16):
- subq %rdi, %r11
- je L(finz)
- movq %r11, %r10
- jmp L(small)
-
- .p2align 4,, 4
-L(neq):
- bsfl %edx, %ecx
- movzbl (%rdi, %rcx), %eax
- addq %rdi, %rsi
- movzbl (%rsi,%rcx), %edx
- jmp L(finz1)
-
- .p2align 4,, 4
-L(ATR):
- movq %r11, %r10
- andq $-32, %r10
- cmpq %r10, %rdi
- jge L(mt16)
- testq $16, %rdi
- jz L(ATR32)
-
- movdqa (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
- cmpq %rdi, %r10
- je L(mt16)
-
-L(ATR32):
- movq %r11, %r10
- andq $-64, %r10
- testq $32, %rdi
- jz L(ATR64)
-
- movdqa (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- movdqa (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
-L(ATR64):
- cmpq %rdi, %r10
- je L(mt32)
-
-L(ATR64main):
- movdqa (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- movdqa (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- movdqa (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- movdqa (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
- cmpq %rdi, %r10
- jne L(ATR64main)
-
- movq %r11, %r10
- andq $-32, %r10
- cmpq %r10, %rdi
- jge L(mt16)
-
-L(ATR32res):
- movdqa (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- movdqa (%rdi,%rsi), %xmm0
- pcmpeqb (%rdi), %xmm0
- pmovmskb %xmm0, %edx
- subl $0xffff, %edx
- jnz L(neq)
- addq $16, %rdi
-
- cmpq %r10, %rdi
- jne L(ATR32res)
-
- subq %rdi, %r11
- je L(finz)
- movq %r11, %r10
- jmp L(small)
- /* Align to 16byte to improve instruction fetch. */
- .p2align 4,, 4
-END(memcmp)
+ .p2align 4
+L(cross_page):
+ testq %rdx, %rdx
+ je L(return_zero)
+ movzbl (%rdi), %eax
+ movzbl (%rsi), %ecx
+ cmpb %cl, %al
+ jne L(cross_page_different)
+ movl $1, %r8d
+ jmp L(cross_page_loop_start)
+
+ .p2align 4
+L(cross_page_loop):
+ movzbl (%rdi,%r8), %eax
+ movzbl (%rsi,%r8), %ecx
+ cmpb %cl, %al
+ jne L(cross_page_different)
+ addq $1, %r8
+ cmpq $65, %r8
+ je L(align_loop)
+L(cross_page_loop_start):
+ cmpq %rdx, %r8
+ jne L(cross_page_loop)
+L(return_zero):
+ xorl %eax, %eax
+ ret
+L(cross_page_different):
+ subl %ecx, %eax
+ ret
+END(MEMCMP)
-#undef bcmp
+#ifndef USE_AVX2
+#undef bcmp
weak_alias (memcmp, bcmp)
libc_hidden_builtin_def (memcmp)
+#endif
@@ -8,7 +8,7 @@ ifeq ($(subdir),string)
sysdep_routines += strncat-c stpncpy-c strncpy-c strcmp-ssse3 \
strcmp-sse2-unaligned strncmp-ssse3 \
- memcmp-sse4 memcpy-ssse3 \
+ memcpy-ssse3 \
memcpy-sse2-unaligned mempcpy-ssse3 \
memmove-ssse3 memcpy-ssse3-back mempcpy-ssse3-back \
memmove-avx-unaligned memcpy-avx-unaligned mempcpy-avx-unaligned \
@@ -29,7 +29,7 @@ CFLAGS-strspn-c.c += -msse4
endif
ifeq (yes,$(config-cflags-avx2))
-sysdep_routines += memset-avx2 strcpy-avx2 stpcpy-avx2
+sysdep_routines += memset-avx2 strcpy-avx2 stpcpy-avx2 memcmp-avx2
endif
endif
@@ -39,10 +39,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
/* Support sysdeps/x86_64/multiarch/memcmp.S. */
IFUNC_IMPL (i, name, memcmp,
- IFUNC_IMPL_ADD (array, i, memcmp, HAS_SSE4_1,
- __memcmp_sse4_1)
+ // IFUNC_IMPL_ADD (array, i, memcmp, HAS_AVX2, __memcmp_avx2)
IFUNC_IMPL_ADD (array, i, memcmp, HAS_SSSE3, __memcmp_ssse3)
- IFUNC_IMPL_ADD (array, i, memcmp, 1, __memcmp_sse2))
+ IFUNC_IMPL_ADD (array, i, memcmp, 1, __memcmp_sse2_unaligned))
/* Support sysdeps/x86_64/multiarch/memmove_chk.S. */
IFUNC_IMPL (i, name, __memmove_chk,
new file mode 100644
@@ -0,0 +1,3 @@
+#define USE_AVX2
+#define MEMCMP __memcmp_avx2
+#include "../memcmp.S"
@@ -29,33 +29,33 @@ ENTRY(memcmp)
cmpl $0, KIND_OFFSET+__cpu_features(%rip)
jne 1f
call __init_cpu_features
-
-1: testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
+ testl $bit_AVX_Fast_Unaligned_Load, __cpu_features+FEATURE_OFFSET+index_AVX_Fast_Unaligned_Load(%rip)
+ jnz 4f
+ testl $bit_Fast_Unaligned_Load, __cpu_features+FEATURE_OFFSET+index_Fast_Unaligned_Load(%rip)
jnz 2f
- leaq __memcmp_sse2(%rip), %rax
- ret
-
-2: testl $bit_SSE4_1, __cpu_features+CPUID_OFFSET+index_SSE4_1(%rip)
- jz 3f
- leaq __memcmp_sse4_1(%rip), %rax
+1: testl $bit_SSSE3, __cpu_features+CPUID_OFFSET+index_SSSE3(%rip)
+ jnz 3f
+2: leaq __memcmp_sse2_unaligned(%rip), %rax
ret
3: leaq __memcmp_ssse3(%rip), %rax
ret
+4: leaq __memcmp_avx2(%rip), %rax
+ ret
END(memcmp)
# undef ENTRY
# define ENTRY(name) \
- .type __memcmp_sse2, @function; \
+ .type __memcmp_sse2_unaligned, @function; \
.p2align 4; \
- .globl __memcmp_sse2; \
- .hidden __memcmp_sse2; \
- __memcmp_sse2: cfi_startproc; \
+ .globl __memcmp_sse2_unaligned; \
+ .hidden __memcmp_sse2_unaligned; \
+ __memcmp_sse2_unaligned: cfi_startproc; \
CALL_MCOUNT
# undef END
# define END(name) \
- cfi_endproc; .size __memcmp_sse2, .-__memcmp_sse2
+ cfi_endproc; .size __memcmp_sse2_unaligned, .-__memcmp_sse2_unaligned
# ifdef SHARED
# undef libc_hidden_builtin_def
@@ -63,7 +63,7 @@ END(memcmp)
they will be called without setting up EBX needed for PLT which is
used by IFUNC. */
# define libc_hidden_builtin_def(name) \
- .globl __GI_memcmp; __GI_memcmp = __memcmp_sse2
+ .globl __GI_memcmp; __GI_memcmp = __memcmp_sse2_unaligned
# endif
#endif
@@ -1,4 +1,1779 @@
+/* memcmp with SSE4.1, wmemcmp with SSE4.1
+ Copyright (C) 2010-2015 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, see
+ <http://www.gnu.org/licenses/>. */
+
#define USE_AS_WMEMCMP 1
#define MEMCMP __wmemcmp_sse4_1
-#include "memcmp-sse4.S"
+#if IS_IN (libc)
+
+# include <sysdep.h>
+
+# ifndef MEMCMP
+# define MEMCMP __memcmp_sse4_1
+# endif
+
+# define JMPTBL(I, B) (I - B)
+
+# define BRANCH_TO_JMPTBL_ENTRY(TABLE, INDEX, SCALE) \
+ lea TABLE(%rip), %r11; \
+ movslq (%r11, INDEX, SCALE), %rcx; \
+ add %r11, %rcx; \
+ jmp *%rcx; \
+ ud2
+
+/* Warning!
+ wmemcmp has to use SIGNED comparison for elements.
+ memcmp has to use UNSIGNED comparison for elemnts.
+*/
+
+ .section .text.sse4.1,"ax",@progbits
+ENTRY (MEMCMP)
+# ifdef USE_AS_WMEMCMP
+ shl $2, %rdx
+# endif
+ pxor %xmm0, %xmm0
+ cmp $79, %rdx
+ ja L(79bytesormore)
+# ifndef USE_AS_WMEMCMP
+ cmp $1, %rdx
+ je L(firstbyte)
+# endif
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+
+# ifndef USE_AS_WMEMCMP
+ .p2align 4
+L(firstbyte):
+ movzbl (%rdi), %eax
+ movzbl (%rsi), %ecx
+ sub %ecx, %eax
+ ret
+# endif
+
+ .p2align 4
+L(79bytesormore):
+ movdqu (%rsi), %xmm1
+ movdqu (%rdi), %xmm2
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+ mov %rsi, %rcx
+ and $-16, %rsi
+ add $16, %rsi
+ sub %rsi, %rcx
+
+ sub %rcx, %rdi
+ add %rcx, %rdx
+ test $0xf, %rdi
+ jz L(2aligned)
+
+ cmp $128, %rdx
+ ja L(128bytesormore)
+L(less128bytes):
+ sub $64, %rdx
+
+ movdqu (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+
+ movdqu 16(%rdi), %xmm2
+ pxor 16(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(32bytesin256)
+
+ movdqu 32(%rdi), %xmm2
+ pxor 32(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(48bytesin256)
+
+ movdqu 48(%rdi), %xmm2
+ pxor 48(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(64bytesin256)
+ cmp $32, %rdx
+ jb L(less32bytesin64)
+
+ movdqu 64(%rdi), %xmm2
+ pxor 64(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(80bytesin256)
+
+ movdqu 80(%rdi), %xmm2
+ pxor 80(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(96bytesin256)
+ sub $32, %rdx
+ add $32, %rdi
+ add $32, %rsi
+L(less32bytesin64):
+ add $64, %rdi
+ add $64, %rsi
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+
+L(128bytesormore):
+ cmp $512, %rdx
+ ja L(512bytesormore)
+ cmp $256, %rdx
+ ja L(less512bytes)
+L(less256bytes):
+ sub $128, %rdx
+
+ movdqu (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+
+ movdqu 16(%rdi), %xmm2
+ pxor 16(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(32bytesin256)
+
+ movdqu 32(%rdi), %xmm2
+ pxor 32(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(48bytesin256)
+
+ movdqu 48(%rdi), %xmm2
+ pxor 48(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(64bytesin256)
+
+ movdqu 64(%rdi), %xmm2
+ pxor 64(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(80bytesin256)
+
+ movdqu 80(%rdi), %xmm2
+ pxor 80(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(96bytesin256)
+
+ movdqu 96(%rdi), %xmm2
+ pxor 96(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(112bytesin256)
+
+ movdqu 112(%rdi), %xmm2
+ pxor 112(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(128bytesin256)
+
+ add $128, %rsi
+ add $128, %rdi
+
+ cmp $64, %rdx
+ jae L(less128bytes)
+
+ cmp $32, %rdx
+ jb L(less32bytesin128)
+
+ movdqu (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+
+ movdqu 16(%rdi), %xmm2
+ pxor 16(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(32bytesin256)
+ sub $32, %rdx
+ add $32, %rdi
+ add $32, %rsi
+L(less32bytesin128):
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+
+L(less512bytes):
+ sub $256, %rdx
+ movdqu (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+
+ movdqu 16(%rdi), %xmm2
+ pxor 16(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(32bytesin256)
+
+ movdqu 32(%rdi), %xmm2
+ pxor 32(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(48bytesin256)
+
+ movdqu 48(%rdi), %xmm2
+ pxor 48(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(64bytesin256)
+
+ movdqu 64(%rdi), %xmm2
+ pxor 64(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(80bytesin256)
+
+ movdqu 80(%rdi), %xmm2
+ pxor 80(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(96bytesin256)
+
+ movdqu 96(%rdi), %xmm2
+ pxor 96(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(112bytesin256)
+
+ movdqu 112(%rdi), %xmm2
+ pxor 112(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(128bytesin256)
+
+ movdqu 128(%rdi), %xmm2
+ pxor 128(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(144bytesin256)
+
+ movdqu 144(%rdi), %xmm2
+ pxor 144(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(160bytesin256)
+
+ movdqu 160(%rdi), %xmm2
+ pxor 160(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(176bytesin256)
+
+ movdqu 176(%rdi), %xmm2
+ pxor 176(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(192bytesin256)
+
+ movdqu 192(%rdi), %xmm2
+ pxor 192(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(208bytesin256)
+
+ movdqu 208(%rdi), %xmm2
+ pxor 208(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(224bytesin256)
+
+ movdqu 224(%rdi), %xmm2
+ pxor 224(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(240bytesin256)
+
+ movdqu 240(%rdi), %xmm2
+ pxor 240(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(256bytesin256)
+
+ add $256, %rsi
+ add $256, %rdi
+
+ cmp $128, %rdx
+ jae L(less256bytes)
+
+ cmp $64, %rdx
+ jae L(less128bytes)
+
+ cmp $32, %rdx
+ jb L(less32bytesin256)
+
+ movdqu (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+
+ movdqu 16(%rdi), %xmm2
+ pxor 16(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(32bytesin256)
+ sub $32, %rdx
+ add $32, %rdi
+ add $32, %rsi
+L(less32bytesin256):
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+
+ .p2align 4
+L(512bytesormore):
+# ifdef DATA_CACHE_SIZE_HALF
+ mov $DATA_CACHE_SIZE_HALF, %R8_LP
+# else
+ mov __x86_data_cache_size_half(%rip), %R8_LP
+# endif
+ mov %r8, %r9
+ shr $1, %r8
+ add %r9, %r8
+ cmp %r8, %rdx
+ ja L(L2_L3_cache_unaglined)
+ sub $64, %rdx
+ .p2align 4
+L(64bytesormore_loop):
+ movdqu (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ movdqa %xmm2, %xmm1
+
+ movdqu 16(%rdi), %xmm3
+ pxor 16(%rsi), %xmm3
+ por %xmm3, %xmm1
+
+ movdqu 32(%rdi), %xmm4
+ pxor 32(%rsi), %xmm4
+ por %xmm4, %xmm1
+
+ movdqu 48(%rdi), %xmm5
+ pxor 48(%rsi), %xmm5
+ por %xmm5, %xmm1
+
+ ptest %xmm1, %xmm0
+ jnc L(64bytesormore_loop_end)
+ add $64, %rsi
+ add $64, %rdi
+ sub $64, %rdx
+ jae L(64bytesormore_loop)
+
+ add $64, %rdx
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+
+L(L2_L3_cache_unaglined):
+ sub $64, %rdx
+ .p2align 4
+L(L2_L3_unaligned_128bytes_loop):
+ prefetchnta 0x1c0(%rdi)
+ prefetchnta 0x1c0(%rsi)
+ movdqu (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ movdqa %xmm2, %xmm1
+
+ movdqu 16(%rdi), %xmm3
+ pxor 16(%rsi), %xmm3
+ por %xmm3, %xmm1
+
+ movdqu 32(%rdi), %xmm4
+ pxor 32(%rsi), %xmm4
+ por %xmm4, %xmm1
+
+ movdqu 48(%rdi), %xmm5
+ pxor 48(%rsi), %xmm5
+ por %xmm5, %xmm1
+
+ ptest %xmm1, %xmm0
+ jnc L(64bytesormore_loop_end)
+ add $64, %rsi
+ add $64, %rdi
+ sub $64, %rdx
+ jae L(L2_L3_unaligned_128bytes_loop)
+
+ add $64, %rdx
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+
+/*
+ * This case is for machines which are sensitive for unaligned instructions.
+ */
+ .p2align 4
+L(2aligned):
+ cmp $128, %rdx
+ ja L(128bytesormorein2aligned)
+L(less128bytesin2aligned):
+ sub $64, %rdx
+
+ movdqa (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+
+ movdqa 16(%rdi), %xmm2
+ pxor 16(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(32bytesin256)
+
+ movdqa 32(%rdi), %xmm2
+ pxor 32(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(48bytesin256)
+
+ movdqa 48(%rdi), %xmm2
+ pxor 48(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(64bytesin256)
+ cmp $32, %rdx
+ jb L(less32bytesin64in2alinged)
+
+ movdqa 64(%rdi), %xmm2
+ pxor 64(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(80bytesin256)
+
+ movdqa 80(%rdi), %xmm2
+ pxor 80(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(96bytesin256)
+ sub $32, %rdx
+ add $32, %rdi
+ add $32, %rsi
+L(less32bytesin64in2alinged):
+ add $64, %rdi
+ add $64, %rsi
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+
+ .p2align 4
+L(128bytesormorein2aligned):
+ cmp $512, %rdx
+ ja L(512bytesormorein2aligned)
+ cmp $256, %rdx
+ ja L(256bytesormorein2aligned)
+L(less256bytesin2alinged):
+ sub $128, %rdx
+
+ movdqa (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+
+ movdqa 16(%rdi), %xmm2
+ pxor 16(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(32bytesin256)
+
+ movdqa 32(%rdi), %xmm2
+ pxor 32(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(48bytesin256)
+
+ movdqa 48(%rdi), %xmm2
+ pxor 48(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(64bytesin256)
+
+ movdqa 64(%rdi), %xmm2
+ pxor 64(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(80bytesin256)
+
+ movdqa 80(%rdi), %xmm2
+ pxor 80(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(96bytesin256)
+
+ movdqa 96(%rdi), %xmm2
+ pxor 96(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(112bytesin256)
+
+ movdqa 112(%rdi), %xmm2
+ pxor 112(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(128bytesin256)
+
+ add $128, %rsi
+ add $128, %rdi
+
+ cmp $64, %rdx
+ jae L(less128bytesin2aligned)
+
+ cmp $32, %rdx
+ jb L(less32bytesin128in2aligned)
+
+ movdqu (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+
+ movdqu 16(%rdi), %xmm2
+ pxor 16(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(32bytesin256)
+ sub $32, %rdx
+ add $32, %rdi
+ add $32, %rsi
+L(less32bytesin128in2aligned):
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+
+ .p2align 4
+L(256bytesormorein2aligned):
+
+ sub $256, %rdx
+ movdqa (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+
+ movdqa 16(%rdi), %xmm2
+ pxor 16(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(32bytesin256)
+
+ movdqa 32(%rdi), %xmm2
+ pxor 32(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(48bytesin256)
+
+ movdqa 48(%rdi), %xmm2
+ pxor 48(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(64bytesin256)
+
+ movdqa 64(%rdi), %xmm2
+ pxor 64(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(80bytesin256)
+
+ movdqa 80(%rdi), %xmm2
+ pxor 80(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(96bytesin256)
+
+ movdqa 96(%rdi), %xmm2
+ pxor 96(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(112bytesin256)
+
+ movdqa 112(%rdi), %xmm2
+ pxor 112(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(128bytesin256)
+
+ movdqa 128(%rdi), %xmm2
+ pxor 128(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(144bytesin256)
+
+ movdqa 144(%rdi), %xmm2
+ pxor 144(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(160bytesin256)
+
+ movdqa 160(%rdi), %xmm2
+ pxor 160(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(176bytesin256)
+
+ movdqa 176(%rdi), %xmm2
+ pxor 176(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(192bytesin256)
+
+ movdqa 192(%rdi), %xmm2
+ pxor 192(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(208bytesin256)
+
+ movdqa 208(%rdi), %xmm2
+ pxor 208(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(224bytesin256)
+
+ movdqa 224(%rdi), %xmm2
+ pxor 224(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(240bytesin256)
+
+ movdqa 240(%rdi), %xmm2
+ pxor 240(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(256bytesin256)
+
+ add $256, %rsi
+ add $256, %rdi
+
+ cmp $128, %rdx
+ jae L(less256bytesin2alinged)
+
+ cmp $64, %rdx
+ jae L(less128bytesin2aligned)
+
+ cmp $32, %rdx
+ jb L(less32bytesin256in2alinged)
+
+ movdqa (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(16bytesin256)
+
+ movdqa 16(%rdi), %xmm2
+ pxor 16(%rsi), %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(32bytesin256)
+ sub $32, %rdx
+ add $32, %rdi
+ add $32, %rsi
+L(less32bytesin256in2alinged):
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+
+ .p2align 4
+L(512bytesormorein2aligned):
+# ifdef DATA_CACHE_SIZE_HALF
+ mov $DATA_CACHE_SIZE_HALF, %R8_LP
+# else
+ mov __x86_data_cache_size_half(%rip), %R8_LP
+# endif
+ mov %r8, %r9
+ shr $1, %r8
+ add %r9, %r8
+ cmp %r8, %rdx
+ ja L(L2_L3_cache_aglined)
+
+ sub $64, %rdx
+ .p2align 4
+L(64bytesormore_loopin2aligned):
+ movdqa (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ movdqa %xmm2, %xmm1
+
+ movdqa 16(%rdi), %xmm3
+ pxor 16(%rsi), %xmm3
+ por %xmm3, %xmm1
+
+ movdqa 32(%rdi), %xmm4
+ pxor 32(%rsi), %xmm4
+ por %xmm4, %xmm1
+
+ movdqa 48(%rdi), %xmm5
+ pxor 48(%rsi), %xmm5
+ por %xmm5, %xmm1
+
+ ptest %xmm1, %xmm0
+ jnc L(64bytesormore_loop_end)
+ add $64, %rsi
+ add $64, %rdi
+ sub $64, %rdx
+ jae L(64bytesormore_loopin2aligned)
+
+ add $64, %rdx
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+L(L2_L3_cache_aglined):
+ sub $64, %rdx
+
+ .p2align 4
+L(L2_L3_aligned_128bytes_loop):
+ prefetchnta 0x1c0(%rdi)
+ prefetchnta 0x1c0(%rsi)
+ movdqa (%rdi), %xmm2
+ pxor (%rsi), %xmm2
+ movdqa %xmm2, %xmm1
+
+ movdqa 16(%rdi), %xmm3
+ pxor 16(%rsi), %xmm3
+ por %xmm3, %xmm1
+
+ movdqa 32(%rdi), %xmm4
+ pxor 32(%rsi), %xmm4
+ por %xmm4, %xmm1
+
+ movdqa 48(%rdi), %xmm5
+ pxor 48(%rsi), %xmm5
+ por %xmm5, %xmm1
+
+ ptest %xmm1, %xmm0
+ jnc L(64bytesormore_loop_end)
+ add $64, %rsi
+ add $64, %rdi
+ sub $64, %rdx
+ jae L(L2_L3_aligned_128bytes_loop)
+
+ add $64, %rdx
+ add %rdx, %rsi
+ add %rdx, %rdi
+ BRANCH_TO_JMPTBL_ENTRY(L(table_64bytes), %rdx, 4)
+
+
+ .p2align 4
+L(64bytesormore_loop_end):
+ add $16, %rdi
+ add $16, %rsi
+ ptest %xmm2, %xmm0
+ jnc L(16bytes)
+
+ add $16, %rdi
+ add $16, %rsi
+ ptest %xmm3, %xmm0
+ jnc L(16bytes)
+
+ add $16, %rdi
+ add $16, %rsi
+ ptest %xmm4, %xmm0
+ jnc L(16bytes)
+
+ add $16, %rdi
+ add $16, %rsi
+ jmp L(16bytes)
+
+L(256bytesin256):
+ add $256, %rdi
+ add $256, %rsi
+ jmp L(16bytes)
+L(240bytesin256):
+ add $240, %rdi
+ add $240, %rsi
+ jmp L(16bytes)
+L(224bytesin256):
+ add $224, %rdi
+ add $224, %rsi
+ jmp L(16bytes)
+L(208bytesin256):
+ add $208, %rdi
+ add $208, %rsi
+ jmp L(16bytes)
+L(192bytesin256):
+ add $192, %rdi
+ add $192, %rsi
+ jmp L(16bytes)
+L(176bytesin256):
+ add $176, %rdi
+ add $176, %rsi
+ jmp L(16bytes)
+L(160bytesin256):
+ add $160, %rdi
+ add $160, %rsi
+ jmp L(16bytes)
+L(144bytesin256):
+ add $144, %rdi
+ add $144, %rsi
+ jmp L(16bytes)
+L(128bytesin256):
+ add $128, %rdi
+ add $128, %rsi
+ jmp L(16bytes)
+L(112bytesin256):
+ add $112, %rdi
+ add $112, %rsi
+ jmp L(16bytes)
+L(96bytesin256):
+ add $96, %rdi
+ add $96, %rsi
+ jmp L(16bytes)
+L(80bytesin256):
+ add $80, %rdi
+ add $80, %rsi
+ jmp L(16bytes)
+L(64bytesin256):
+ add $64, %rdi
+ add $64, %rsi
+ jmp L(16bytes)
+L(48bytesin256):
+ add $16, %rdi
+ add $16, %rsi
+L(32bytesin256):
+ add $16, %rdi
+ add $16, %rsi
+L(16bytesin256):
+ add $16, %rdi
+ add $16, %rsi
+L(16bytes):
+ mov -16(%rdi), %rax
+ mov -16(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+L(8bytes):
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(12bytes):
+ mov -12(%rdi), %rax
+ mov -12(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+L(4bytes):
+ mov -4(%rsi), %ecx
+# ifndef USE_AS_WMEMCMP
+ mov -4(%rdi), %eax
+ cmp %eax, %ecx
+# else
+ cmp -4(%rdi), %ecx
+# endif
+ jne L(diffin4bytes)
+L(0bytes):
+ xor %eax, %eax
+ ret
+
+# ifndef USE_AS_WMEMCMP
+/* unreal case for wmemcmp */
+ .p2align 4
+L(65bytes):
+ movdqu -65(%rdi), %xmm1
+ movdqu -65(%rsi), %xmm2
+ mov $-65, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(49bytes):
+ movdqu -49(%rdi), %xmm1
+ movdqu -49(%rsi), %xmm2
+ mov $-49, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(33bytes):
+ movdqu -33(%rdi), %xmm1
+ movdqu -33(%rsi), %xmm2
+ mov $-33, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(17bytes):
+ mov -17(%rdi), %rax
+ mov -17(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+L(9bytes):
+ mov -9(%rdi), %rax
+ mov -9(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ movzbl -1(%rdi), %eax
+ movzbl -1(%rsi), %edx
+ sub %edx, %eax
+ ret
+
+ .p2align 4
+L(13bytes):
+ mov -13(%rdi), %rax
+ mov -13(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(5bytes):
+ mov -5(%rdi), %eax
+ mov -5(%rsi), %ecx
+ cmp %eax, %ecx
+ jne L(diffin4bytes)
+ movzbl -1(%rdi), %eax
+ movzbl -1(%rsi), %edx
+ sub %edx, %eax
+ ret
+
+ .p2align 4
+L(66bytes):
+ movdqu -66(%rdi), %xmm1
+ movdqu -66(%rsi), %xmm2
+ mov $-66, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(50bytes):
+ movdqu -50(%rdi), %xmm1
+ movdqu -50(%rsi), %xmm2
+ mov $-50, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(34bytes):
+ movdqu -34(%rdi), %xmm1
+ movdqu -34(%rsi), %xmm2
+ mov $-34, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(18bytes):
+ mov -18(%rdi), %rax
+ mov -18(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+L(10bytes):
+ mov -10(%rdi), %rax
+ mov -10(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ movzwl -2(%rdi), %eax
+ movzwl -2(%rsi), %ecx
+ cmp %cl, %al
+ jne L(end)
+ and $0xffff, %eax
+ and $0xffff, %ecx
+ sub %ecx, %eax
+ ret
+
+ .p2align 4
+L(14bytes):
+ mov -14(%rdi), %rax
+ mov -14(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(6bytes):
+ mov -6(%rdi), %eax
+ mov -6(%rsi), %ecx
+ cmp %eax, %ecx
+ jne L(diffin4bytes)
+L(2bytes):
+ movzwl -2(%rsi), %ecx
+ movzwl -2(%rdi), %eax
+ cmp %cl, %al
+ jne L(end)
+ and $0xffff, %eax
+ and $0xffff, %ecx
+ sub %ecx, %eax
+ ret
+
+ .p2align 4
+L(67bytes):
+ movdqu -67(%rdi), %xmm2
+ movdqu -67(%rsi), %xmm1
+ mov $-67, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(51bytes):
+ movdqu -51(%rdi), %xmm2
+ movdqu -51(%rsi), %xmm1
+ mov $-51, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(35bytes):
+ movdqu -35(%rsi), %xmm1
+ movdqu -35(%rdi), %xmm2
+ mov $-35, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(19bytes):
+ mov -19(%rdi), %rax
+ mov -19(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+L(11bytes):
+ mov -11(%rdi), %rax
+ mov -11(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ mov -4(%rdi), %eax
+ mov -4(%rsi), %ecx
+ cmp %eax, %ecx
+ jne L(diffin4bytes)
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(15bytes):
+ mov -15(%rdi), %rax
+ mov -15(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(7bytes):
+ mov -7(%rdi), %eax
+ mov -7(%rsi), %ecx
+ cmp %eax, %ecx
+ jne L(diffin4bytes)
+ mov -4(%rdi), %eax
+ mov -4(%rsi), %ecx
+ cmp %eax, %ecx
+ jne L(diffin4bytes)
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(3bytes):
+ movzwl -3(%rdi), %eax
+ movzwl -3(%rsi), %ecx
+ cmp %eax, %ecx
+ jne L(diffin2bytes)
+L(1bytes):
+ movzbl -1(%rdi), %eax
+ movzbl -1(%rsi), %ecx
+ sub %ecx, %eax
+ ret
+# endif
+
+ .p2align 4
+L(68bytes):
+ movdqu -68(%rdi), %xmm2
+ movdqu -68(%rsi), %xmm1
+ mov $-68, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(52bytes):
+ movdqu -52(%rdi), %xmm2
+ movdqu -52(%rsi), %xmm1
+ mov $-52, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(36bytes):
+ movdqu -36(%rdi), %xmm2
+ movdqu -36(%rsi), %xmm1
+ mov $-36, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(20bytes):
+ movdqu -20(%rdi), %xmm2
+ movdqu -20(%rsi), %xmm1
+ mov $-20, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+ mov -4(%rsi), %ecx
+
+# ifndef USE_AS_WMEMCMP
+ mov -4(%rdi), %eax
+ cmp %eax, %ecx
+# else
+ cmp -4(%rdi), %ecx
+# endif
+ jne L(diffin4bytes)
+ xor %eax, %eax
+ ret
+
+# ifndef USE_AS_WMEMCMP
+/* unreal cases for wmemcmp */
+ .p2align 4
+L(69bytes):
+ movdqu -69(%rsi), %xmm1
+ movdqu -69(%rdi), %xmm2
+ mov $-69, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(53bytes):
+ movdqu -53(%rsi), %xmm1
+ movdqu -53(%rdi), %xmm2
+ mov $-53, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(37bytes):
+ movdqu -37(%rsi), %xmm1
+ movdqu -37(%rdi), %xmm2
+ mov $-37, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(21bytes):
+ movdqu -21(%rsi), %xmm1
+ movdqu -21(%rdi), %xmm2
+ mov $-21, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(70bytes):
+ movdqu -70(%rsi), %xmm1
+ movdqu -70(%rdi), %xmm2
+ mov $-70, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(54bytes):
+ movdqu -54(%rsi), %xmm1
+ movdqu -54(%rdi), %xmm2
+ mov $-54, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(38bytes):
+ movdqu -38(%rsi), %xmm1
+ movdqu -38(%rdi), %xmm2
+ mov $-38, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(22bytes):
+ movdqu -22(%rsi), %xmm1
+ movdqu -22(%rdi), %xmm2
+ mov $-22, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(71bytes):
+ movdqu -71(%rsi), %xmm1
+ movdqu -71(%rdi), %xmm2
+ mov $-71, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(55bytes):
+ movdqu -55(%rdi), %xmm2
+ movdqu -55(%rsi), %xmm1
+ mov $-55, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(39bytes):
+ movdqu -39(%rdi), %xmm2
+ movdqu -39(%rsi), %xmm1
+ mov $-39, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(23bytes):
+ movdqu -23(%rdi), %xmm2
+ movdqu -23(%rsi), %xmm1
+ mov $-23, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+# endif
+
+ .p2align 4
+L(72bytes):
+ movdqu -72(%rsi), %xmm1
+ movdqu -72(%rdi), %xmm2
+ mov $-72, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(56bytes):
+ movdqu -56(%rdi), %xmm2
+ movdqu -56(%rsi), %xmm1
+ mov $-56, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(40bytes):
+ movdqu -40(%rdi), %xmm2
+ movdqu -40(%rsi), %xmm1
+ mov $-40, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(24bytes):
+ movdqu -24(%rdi), %xmm2
+ movdqu -24(%rsi), %xmm1
+ mov $-24, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+
+ mov -8(%rsi), %rcx
+ mov -8(%rdi), %rax
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+
+# ifndef USE_AS_WMEMCMP
+/* unreal cases for wmemcmp */
+ .p2align 4
+L(73bytes):
+ movdqu -73(%rsi), %xmm1
+ movdqu -73(%rdi), %xmm2
+ mov $-73, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(57bytes):
+ movdqu -57(%rdi), %xmm2
+ movdqu -57(%rsi), %xmm1
+ mov $-57, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(41bytes):
+ movdqu -41(%rdi), %xmm2
+ movdqu -41(%rsi), %xmm1
+ mov $-41, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(25bytes):
+ movdqu -25(%rdi), %xmm2
+ movdqu -25(%rsi), %xmm1
+ mov $-25, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+ mov -9(%rdi), %rax
+ mov -9(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ movzbl -1(%rdi), %eax
+ movzbl -1(%rsi), %ecx
+ sub %ecx, %eax
+ ret
+
+ .p2align 4
+L(74bytes):
+ movdqu -74(%rsi), %xmm1
+ movdqu -74(%rdi), %xmm2
+ mov $-74, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(58bytes):
+ movdqu -58(%rdi), %xmm2
+ movdqu -58(%rsi), %xmm1
+ mov $-58, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(42bytes):
+ movdqu -42(%rdi), %xmm2
+ movdqu -42(%rsi), %xmm1
+ mov $-42, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(26bytes):
+ movdqu -26(%rdi), %xmm2
+ movdqu -26(%rsi), %xmm1
+ mov $-26, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+ mov -10(%rdi), %rax
+ mov -10(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ movzwl -2(%rdi), %eax
+ movzwl -2(%rsi), %ecx
+ jmp L(diffin2bytes)
+
+ .p2align 4
+L(75bytes):
+ movdqu -75(%rsi), %xmm1
+ movdqu -75(%rdi), %xmm2
+ mov $-75, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(59bytes):
+ movdqu -59(%rdi), %xmm2
+ movdqu -59(%rsi), %xmm1
+ mov $-59, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(43bytes):
+ movdqu -43(%rdi), %xmm2
+ movdqu -43(%rsi), %xmm1
+ mov $-43, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(27bytes):
+ movdqu -27(%rdi), %xmm2
+ movdqu -27(%rsi), %xmm1
+ mov $-27, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+ mov -11(%rdi), %rax
+ mov -11(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ mov -4(%rdi), %eax
+ mov -4(%rsi), %ecx
+ cmp %eax, %ecx
+ jne L(diffin4bytes)
+ xor %eax, %eax
+ ret
+# endif
+ .p2align 4
+L(76bytes):
+ movdqu -76(%rsi), %xmm1
+ movdqu -76(%rdi), %xmm2
+ mov $-76, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(60bytes):
+ movdqu -60(%rdi), %xmm2
+ movdqu -60(%rsi), %xmm1
+ mov $-60, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(44bytes):
+ movdqu -44(%rdi), %xmm2
+ movdqu -44(%rsi), %xmm1
+ mov $-44, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(28bytes):
+ movdqu -28(%rdi), %xmm2
+ movdqu -28(%rsi), %xmm1
+ mov $-28, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+ mov -12(%rdi), %rax
+ mov -12(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ mov -4(%rsi), %ecx
+# ifndef USE_AS_WMEMCMP
+ mov -4(%rdi), %eax
+ cmp %eax, %ecx
+# else
+ cmp -4(%rdi), %ecx
+# endif
+ jne L(diffin4bytes)
+ xor %eax, %eax
+ ret
+
+# ifndef USE_AS_WMEMCMP
+/* unreal cases for wmemcmp */
+ .p2align 4
+L(77bytes):
+ movdqu -77(%rsi), %xmm1
+ movdqu -77(%rdi), %xmm2
+ mov $-77, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(61bytes):
+ movdqu -61(%rdi), %xmm2
+ movdqu -61(%rsi), %xmm1
+ mov $-61, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(45bytes):
+ movdqu -45(%rdi), %xmm2
+ movdqu -45(%rsi), %xmm1
+ mov $-45, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(29bytes):
+ movdqu -29(%rdi), %xmm2
+ movdqu -29(%rsi), %xmm1
+ mov $-29, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+
+ mov -13(%rdi), %rax
+ mov -13(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(78bytes):
+ movdqu -78(%rsi), %xmm1
+ movdqu -78(%rdi), %xmm2
+ mov $-78, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(62bytes):
+ movdqu -62(%rdi), %xmm2
+ movdqu -62(%rsi), %xmm1
+ mov $-62, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(46bytes):
+ movdqu -46(%rdi), %xmm2
+ movdqu -46(%rsi), %xmm1
+ mov $-46, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(30bytes):
+ movdqu -30(%rdi), %xmm2
+ movdqu -30(%rsi), %xmm1
+ mov $-30, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+ mov -14(%rdi), %rax
+ mov -14(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(79bytes):
+ movdqu -79(%rsi), %xmm1
+ movdqu -79(%rdi), %xmm2
+ mov $-79, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(63bytes):
+ movdqu -63(%rdi), %xmm2
+ movdqu -63(%rsi), %xmm1
+ mov $-63, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(47bytes):
+ movdqu -47(%rdi), %xmm2
+ movdqu -47(%rsi), %xmm1
+ mov $-47, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(31bytes):
+ movdqu -31(%rdi), %xmm2
+ movdqu -31(%rsi), %xmm1
+ mov $-31, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+ mov -15(%rdi), %rax
+ mov -15(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+# endif
+ .p2align 4
+L(64bytes):
+ movdqu -64(%rdi), %xmm2
+ movdqu -64(%rsi), %xmm1
+ mov $-64, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(48bytes):
+ movdqu -48(%rdi), %xmm2
+ movdqu -48(%rsi), %xmm1
+ mov $-48, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+L(32bytes):
+ movdqu -32(%rdi), %xmm2
+ movdqu -32(%rsi), %xmm1
+ mov $-32, %dl
+ pxor %xmm1, %xmm2
+ ptest %xmm2, %xmm0
+ jnc L(less16bytes)
+
+ mov -16(%rdi), %rax
+ mov -16(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+
+ mov -8(%rdi), %rax
+ mov -8(%rsi), %rcx
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ xor %eax, %eax
+ ret
+
+/*
+ * Aligned 8 bytes to avoid 2 branch "taken" in one 16 alinged code block.
+ */
+ .p2align 3
+L(less16bytes):
+ movsbq %dl, %rdx
+ mov (%rsi, %rdx), %rcx
+ mov (%rdi, %rdx), %rax
+ cmp %rax, %rcx
+ jne L(diffin8bytes)
+ mov 8(%rsi, %rdx), %rcx
+ mov 8(%rdi, %rdx), %rax
+L(diffin8bytes):
+ cmp %eax, %ecx
+ jne L(diffin4bytes)
+ shr $32, %rcx
+ shr $32, %rax
+
+# ifdef USE_AS_WMEMCMP
+/* for wmemcmp */
+ cmp %eax, %ecx
+ jne L(diffin4bytes)
+ xor %eax, %eax
+ ret
+# endif
+
+L(diffin4bytes):
+# ifndef USE_AS_WMEMCMP
+ cmp %cx, %ax
+ jne L(diffin2bytes)
+ shr $16, %ecx
+ shr $16, %eax
+L(diffin2bytes):
+ cmp %cl, %al
+ jne L(end)
+ and $0xffff, %eax
+ and $0xffff, %ecx
+ sub %ecx, %eax
+ ret
+
+ .p2align 4
+L(end):
+ and $0xff, %eax
+ and $0xff, %ecx
+ sub %ecx, %eax
+ ret
+# else
+
+/* for wmemcmp */
+ mov $1, %eax
+ jl L(nequal_bigger)
+ neg %eax
+ ret
+
+ .p2align 4
+L(nequal_bigger):
+ ret
+
+L(unreal_case):
+ xor %eax, %eax
+ ret
+# endif
+
+END (MEMCMP)
+
+ .section .rodata.sse4.1,"a",@progbits
+ .p2align 3
+# ifndef USE_AS_WMEMCMP
+L(table_64bytes):
+ .int JMPTBL (L(0bytes), L(table_64bytes))
+ .int JMPTBL (L(1bytes), L(table_64bytes))
+ .int JMPTBL (L(2bytes), L(table_64bytes))
+ .int JMPTBL (L(3bytes), L(table_64bytes))
+ .int JMPTBL (L(4bytes), L(table_64bytes))
+ .int JMPTBL (L(5bytes), L(table_64bytes))
+ .int JMPTBL (L(6bytes), L(table_64bytes))
+ .int JMPTBL (L(7bytes), L(table_64bytes))
+ .int JMPTBL (L(8bytes), L(table_64bytes))
+ .int JMPTBL (L(9bytes), L(table_64bytes))
+ .int JMPTBL (L(10bytes), L(table_64bytes))
+ .int JMPTBL (L(11bytes), L(table_64bytes))
+ .int JMPTBL (L(12bytes), L(table_64bytes))
+ .int JMPTBL (L(13bytes), L(table_64bytes))
+ .int JMPTBL (L(14bytes), L(table_64bytes))
+ .int JMPTBL (L(15bytes), L(table_64bytes))
+ .int JMPTBL (L(16bytes), L(table_64bytes))
+ .int JMPTBL (L(17bytes), L(table_64bytes))
+ .int JMPTBL (L(18bytes), L(table_64bytes))
+ .int JMPTBL (L(19bytes), L(table_64bytes))
+ .int JMPTBL (L(20bytes), L(table_64bytes))
+ .int JMPTBL (L(21bytes), L(table_64bytes))
+ .int JMPTBL (L(22bytes), L(table_64bytes))
+ .int JMPTBL (L(23bytes), L(table_64bytes))
+ .int JMPTBL (L(24bytes), L(table_64bytes))
+ .int JMPTBL (L(25bytes), L(table_64bytes))
+ .int JMPTBL (L(26bytes), L(table_64bytes))
+ .int JMPTBL (L(27bytes), L(table_64bytes))
+ .int JMPTBL (L(28bytes), L(table_64bytes))
+ .int JMPTBL (L(29bytes), L(table_64bytes))
+ .int JMPTBL (L(30bytes), L(table_64bytes))
+ .int JMPTBL (L(31bytes), L(table_64bytes))
+ .int JMPTBL (L(32bytes), L(table_64bytes))
+ .int JMPTBL (L(33bytes), L(table_64bytes))
+ .int JMPTBL (L(34bytes), L(table_64bytes))
+ .int JMPTBL (L(35bytes), L(table_64bytes))
+ .int JMPTBL (L(36bytes), L(table_64bytes))
+ .int JMPTBL (L(37bytes), L(table_64bytes))
+ .int JMPTBL (L(38bytes), L(table_64bytes))
+ .int JMPTBL (L(39bytes), L(table_64bytes))
+ .int JMPTBL (L(40bytes), L(table_64bytes))
+ .int JMPTBL (L(41bytes), L(table_64bytes))
+ .int JMPTBL (L(42bytes), L(table_64bytes))
+ .int JMPTBL (L(43bytes), L(table_64bytes))
+ .int JMPTBL (L(44bytes), L(table_64bytes))
+ .int JMPTBL (L(45bytes), L(table_64bytes))
+ .int JMPTBL (L(46bytes), L(table_64bytes))
+ .int JMPTBL (L(47bytes), L(table_64bytes))
+ .int JMPTBL (L(48bytes), L(table_64bytes))
+ .int JMPTBL (L(49bytes), L(table_64bytes))
+ .int JMPTBL (L(50bytes), L(table_64bytes))
+ .int JMPTBL (L(51bytes), L(table_64bytes))
+ .int JMPTBL (L(52bytes), L(table_64bytes))
+ .int JMPTBL (L(53bytes), L(table_64bytes))
+ .int JMPTBL (L(54bytes), L(table_64bytes))
+ .int JMPTBL (L(55bytes), L(table_64bytes))
+ .int JMPTBL (L(56bytes), L(table_64bytes))
+ .int JMPTBL (L(57bytes), L(table_64bytes))
+ .int JMPTBL (L(58bytes), L(table_64bytes))
+ .int JMPTBL (L(59bytes), L(table_64bytes))
+ .int JMPTBL (L(60bytes), L(table_64bytes))
+ .int JMPTBL (L(61bytes), L(table_64bytes))
+ .int JMPTBL (L(62bytes), L(table_64bytes))
+ .int JMPTBL (L(63bytes), L(table_64bytes))
+ .int JMPTBL (L(64bytes), L(table_64bytes))
+ .int JMPTBL (L(65bytes), L(table_64bytes))
+ .int JMPTBL (L(66bytes), L(table_64bytes))
+ .int JMPTBL (L(67bytes), L(table_64bytes))
+ .int JMPTBL (L(68bytes), L(table_64bytes))
+ .int JMPTBL (L(69bytes), L(table_64bytes))
+ .int JMPTBL (L(70bytes), L(table_64bytes))
+ .int JMPTBL (L(71bytes), L(table_64bytes))
+ .int JMPTBL (L(72bytes), L(table_64bytes))
+ .int JMPTBL (L(73bytes), L(table_64bytes))
+ .int JMPTBL (L(74bytes), L(table_64bytes))
+ .int JMPTBL (L(75bytes), L(table_64bytes))
+ .int JMPTBL (L(76bytes), L(table_64bytes))
+ .int JMPTBL (L(77bytes), L(table_64bytes))
+ .int JMPTBL (L(78bytes), L(table_64bytes))
+ .int JMPTBL (L(79bytes), L(table_64bytes))
+# else
+L(table_64bytes):
+ .int JMPTBL (L(0bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(4bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(8bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(12bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(16bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(20bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(24bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(28bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(32bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(36bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(40bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(44bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(48bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(52bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(56bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(60bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(64bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(68bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(72bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(76bytes), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+ .int JMPTBL (L(unreal_case), L(table_64bytes))
+# endif
+#endif
Hi, As I sumbitted before in 2013 memcmp improvement here is new version that improves performance a bit more. Also when I browsed results I found that memcmp-sse4 is in fact regression for i7 nehalem, ivy bridge and haswell architectures. There its beaten by old sse2 code by more than 10%. Main idea of new implementation is same, problem with performance is that lot inputs were identical with small n. For that I found that following approach gives best performance when n<64 is likely. if (!cross_page (s1) && !cross_page (s2)) { mask = get_mask(EQ(EQ(LOAD(s1),LOAD(s2)),zero)) mask2 = mask & (2 << (n-1)); if (mask2) return s1[first_byte(mask2)]-s2[first_byte(mask2)]; if (n<=16) return 0; mask |= get_mask(EQ(EQ(LOAD(s1+16),LOAD(s2+16)),zero)) << 16; mask |= get_mask(EQ(EQ(LOAD(s1+16),LOAD(s2+16)),zero)) << 32; mask |= get_mask(EQ(EQ(LOAD(s1+16),LOAD(s2+16)),zero)) << 48; mask2 = mask & (2 << (n-1)); if (mask2) return s1[first_byte(mask2)]-s2[first_byte(mask2)]; if (n<=64) return 0; if (mask) return s1[first_byte(mask)]-s2[first_byte(mask)]; } I didn't checked yet using just registers and byteswap to eliminate need of getting exact byte position as I wrote in related thread. I could improve this bit more, I lose lot of cycles in loop ending conditions. Problem is that I need to handle that unaligned s2 may read from next page, I would need to add more complicated logic to compute number of loop iterations. Thats related to avx2. I as RFC included it but it harm performance on haswell. Last is wmemcmp that I would also need to convert, now I just moved memcmp-sse-4 there. A profile is found here. http://kam.mff.cuni.cz/~ondra/benchmark_string/memcmp_profile.html * sysdeps/x86_64/memcmp.S: New implementation * sysdeps/x86_64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add __memcmp_avx2 * sysdeps/x86_64/multiarch/Makefile(routines): add memcmp-avx2.S * sysdeps/x86_64/multiarch/memcmp-avx2.S: New file. * sysdeps/x86_64/multiarch/memcmp.S: Likewise. * sysdeps/x86_64/multiarch/memcmp-sse4.S: Removed. * sysdeps/x86_64/multiarch/wmemcmp-sse4.S: Moved from memcmp-sse4.S