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1a153e47fc
Optimize x86-64 strcat/strncat, strcpy/strncpy and stpcpy/stpncpy with AVX2.
It uses vector comparison as much as possible. In general, the larger the
source string, the greater performance gain observed, reaching speedups of
1.6x compared to SSE2 unaligned routines. Select AVX2 strcat/strncat,
strcpy/strncpy and stpcpy/stpncpy on AVX2 machines where vzeroupper is
preferred and AVX unaligned load is fast.
* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
strcat-avx2, strncat-avx2, strcpy-avx2, strncpy-avx2,
stpcpy-avx2 and stpncpy-avx2.
* sysdeps/x86_64/multiarch/ifunc-impl-list.c:
(__libc_ifunc_impl_list): Add tests for __strcat_avx2,
__strncat_avx2, __strcpy_avx2, __strncpy_avx2, __stpcpy_avx2
and __stpncpy_avx2.
* sysdeps/x86_64/multiarch/{ifunc-unaligned-ssse3.h =>
ifunc-strcpy.h}: rename header for a more generic name.
* sysdeps/x86_64/multiarch/ifunc-strcpy.h:
(IFUNC_SELECTOR): Return OPTIMIZE (avx2) on AVX 2 machines if
AVX unaligned load is fast and vzeroupper is preferred.
* sysdeps/x86_64/multiarch/stpcpy-avx2.S: New file
* sysdeps/x86_64/multiarch/stpncpy-avx2.S: Likewise
* sysdeps/x86_64/multiarch/strcat-avx2.S: Likewise
* sysdeps/x86_64/multiarch/strcpy-avx2.S: Likewise
* sysdeps/x86_64/multiarch/strncat-avx2.S: Likewise
* sysdeps/x86_64/multiarch/strncpy-avx2.S: Likewise
276 lines
6.1 KiB
ArmAsm
276 lines
6.1 KiB
ArmAsm
/* strcat with AVX2
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Copyright (C) 2011-2018 Free Software Foundation, Inc.
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Contributed by Intel Corporation.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#if IS_IN (libc)
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# include <sysdep.h>
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# ifndef STRCAT
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# define STRCAT __strcat_avx2
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# endif
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# define USE_AS_STRCAT
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/* Number of bytes in a vector register */
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# define VEC_SIZE 32
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.section .text.avx,"ax",@progbits
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ENTRY (STRCAT)
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mov %rdi, %r9
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# ifdef USE_AS_STRNCAT
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mov %rdx, %r8
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# endif
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xor %eax, %eax
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mov %edi, %ecx
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and $((VEC_SIZE * 4) - 1), %ecx
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vpxor %xmm6, %xmm6, %xmm6
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cmp $(VEC_SIZE * 3), %ecx
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ja L(fourth_vector_boundary)
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vpcmpeqb (%rdi), %ymm6, %ymm0
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vpmovmskb %ymm0, %edx
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test %edx, %edx
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jnz L(exit_null_on_first_vector)
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mov %rdi, %rax
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and $-VEC_SIZE, %rax
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jmp L(align_vec_size_start)
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L(fourth_vector_boundary):
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mov %rdi, %rax
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and $-VEC_SIZE, %rax
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vpcmpeqb (%rax), %ymm6, %ymm0
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mov $-1, %r10d
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sub %rax, %rcx
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shl %cl, %r10d
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vpmovmskb %ymm0, %edx
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and %r10d, %edx
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jnz L(exit)
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L(align_vec_size_start):
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vpcmpeqb VEC_SIZE(%rax), %ymm6, %ymm0
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vpmovmskb %ymm0, %edx
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test %edx, %edx
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jnz L(exit_null_on_second_vector)
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vpcmpeqb (VEC_SIZE * 2)(%rax), %ymm6, %ymm1
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vpmovmskb %ymm1, %edx
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test %edx, %edx
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jnz L(exit_null_on_third_vector)
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vpcmpeqb (VEC_SIZE * 3)(%rax), %ymm6, %ymm2
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vpmovmskb %ymm2, %edx
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test %edx, %edx
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jnz L(exit_null_on_fourth_vector)
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vpcmpeqb (VEC_SIZE * 4)(%rax), %ymm6, %ymm3
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vpmovmskb %ymm3, %edx
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test %edx, %edx
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jnz L(exit_null_on_fifth_vector)
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vpcmpeqb (VEC_SIZE * 5)(%rax), %ymm6, %ymm0
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add $(VEC_SIZE * 4), %rax
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vpmovmskb %ymm0, %edx
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test %edx, %edx
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jnz L(exit_null_on_second_vector)
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vpcmpeqb (VEC_SIZE * 2)(%rax), %ymm6, %ymm1
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vpmovmskb %ymm1, %edx
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test %edx, %edx
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jnz L(exit_null_on_third_vector)
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vpcmpeqb (VEC_SIZE * 3)(%rax), %ymm6, %ymm2
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vpmovmskb %ymm2, %edx
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test %edx, %edx
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jnz L(exit_null_on_fourth_vector)
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vpcmpeqb (VEC_SIZE * 4)(%rax), %ymm6, %ymm3
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vpmovmskb %ymm3, %edx
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test %edx, %edx
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jnz L(exit_null_on_fifth_vector)
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vpcmpeqb (VEC_SIZE * 5)(%rax), %ymm6, %ymm0
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add $(VEC_SIZE * 4), %rax
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vpmovmskb %ymm0, %edx
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test %edx, %edx
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jnz L(exit_null_on_second_vector)
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vpcmpeqb (VEC_SIZE * 2)(%rax), %ymm6, %ymm1
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vpmovmskb %ymm1, %edx
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test %edx, %edx
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jnz L(exit_null_on_third_vector)
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vpcmpeqb (VEC_SIZE * 3)(%rax), %ymm6, %ymm2
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vpmovmskb %ymm2, %edx
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test %edx, %edx
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jnz L(exit_null_on_fourth_vector)
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vpcmpeqb (VEC_SIZE * 4)(%rax), %ymm6, %ymm3
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vpmovmskb %ymm3, %edx
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test %edx, %edx
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jnz L(exit_null_on_fifth_vector)
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vpcmpeqb (VEC_SIZE * 5)(%rax), %ymm6, %ymm0
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add $(VEC_SIZE * 4), %rax
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vpmovmskb %ymm0, %edx
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test %edx, %edx
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jnz L(exit_null_on_second_vector)
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vpcmpeqb (VEC_SIZE * 2)(%rax), %ymm6, %ymm1
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vpmovmskb %ymm1, %edx
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test %edx, %edx
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jnz L(exit_null_on_third_vector)
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vpcmpeqb (VEC_SIZE * 3)(%rax), %ymm6, %ymm2
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vpmovmskb %ymm2, %edx
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test %edx, %edx
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jnz L(exit_null_on_fourth_vector)
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vpcmpeqb (VEC_SIZE * 4)(%rax), %ymm6, %ymm3
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vpmovmskb %ymm3, %edx
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test %edx, %edx
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jnz L(exit_null_on_fifth_vector)
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test $((VEC_SIZE * 4) - 1), %rax
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jz L(align_four_vec_loop)
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vpcmpeqb (VEC_SIZE * 5)(%rax), %ymm6, %ymm0
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add $(VEC_SIZE * 5), %rax
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vpmovmskb %ymm0, %edx
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test %edx, %edx
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jnz L(exit)
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test $((VEC_SIZE * 4) - 1), %rax
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jz L(align_four_vec_loop)
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vpcmpeqb VEC_SIZE(%rax), %ymm6, %ymm1
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add $VEC_SIZE, %rax
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vpmovmskb %ymm1, %edx
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test %edx, %edx
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jnz L(exit)
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test $((VEC_SIZE * 4) - 1), %rax
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jz L(align_four_vec_loop)
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vpcmpeqb VEC_SIZE(%rax), %ymm6, %ymm2
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add $VEC_SIZE, %rax
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vpmovmskb %ymm2, %edx
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test %edx, %edx
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jnz L(exit)
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test $((VEC_SIZE * 4) - 1), %rax
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jz L(align_four_vec_loop)
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vpcmpeqb VEC_SIZE(%rax), %ymm6, %ymm3
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add $VEC_SIZE, %rax
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vpmovmskb %ymm3, %edx
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test %edx, %edx
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jnz L(exit)
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add $VEC_SIZE, %rax
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.p2align 4
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L(align_four_vec_loop):
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vmovaps (%rax), %ymm4
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vpminub VEC_SIZE(%rax), %ymm4, %ymm4
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vmovaps (VEC_SIZE * 2)(%rax), %ymm5
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vpminub (VEC_SIZE * 3)(%rax), %ymm5, %ymm5
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add $(VEC_SIZE * 4), %rax
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vpminub %ymm4, %ymm5, %ymm5
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vpcmpeqb %ymm5, %ymm6, %ymm5
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vpmovmskb %ymm5, %edx
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test %edx, %edx
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jz L(align_four_vec_loop)
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vpcmpeqb -(VEC_SIZE * 4)(%rax), %ymm6, %ymm0
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sub $(VEC_SIZE * 5), %rax
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vpmovmskb %ymm0, %edx
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test %edx, %edx
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jnz L(exit_null_on_second_vector)
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vpcmpeqb (VEC_SIZE * 2)(%rax), %ymm6, %ymm1
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vpmovmskb %ymm1, %edx
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test %edx, %edx
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jnz L(exit_null_on_third_vector)
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vpcmpeqb (VEC_SIZE * 3)(%rax), %ymm6, %ymm2
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vpmovmskb %ymm2, %edx
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test %edx, %edx
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jnz L(exit_null_on_fourth_vector)
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vpcmpeqb (VEC_SIZE * 4)(%rax), %ymm6, %ymm3
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vpmovmskb %ymm3, %edx
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sub %rdi, %rax
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bsf %rdx, %rdx
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add %rdx, %rax
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add $(VEC_SIZE * 4), %rax
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jmp L(StartStrcpyPart)
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.p2align 4
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L(exit):
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sub %rdi, %rax
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L(exit_null_on_first_vector):
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bsf %rdx, %rdx
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add %rdx, %rax
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jmp L(StartStrcpyPart)
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.p2align 4
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L(exit_null_on_second_vector):
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sub %rdi, %rax
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bsf %rdx, %rdx
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add %rdx, %rax
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add $VEC_SIZE, %rax
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jmp L(StartStrcpyPart)
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.p2align 4
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L(exit_null_on_third_vector):
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sub %rdi, %rax
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bsf %rdx, %rdx
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add %rdx, %rax
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add $(VEC_SIZE * 2), %rax
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jmp L(StartStrcpyPart)
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.p2align 4
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L(exit_null_on_fourth_vector):
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sub %rdi, %rax
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bsf %rdx, %rdx
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add %rdx, %rax
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add $(VEC_SIZE * 3), %rax
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jmp L(StartStrcpyPart)
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.p2align 4
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L(exit_null_on_fifth_vector):
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sub %rdi, %rax
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bsf %rdx, %rdx
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add %rdx, %rax
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add $(VEC_SIZE * 4), %rax
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.p2align 4
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L(StartStrcpyPart):
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lea (%r9, %rax), %rdi
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mov %rsi, %rcx
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mov %r9, %rax /* save result */
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# ifdef USE_AS_STRNCAT
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test %r8, %r8
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jz L(ExitZero)
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# define USE_AS_STRNCPY
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# endif
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# include "strcpy-avx2.S"
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#endif
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