diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S | 425 |
1 files changed, 0 insertions, 425 deletions
diff --git a/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S b/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S deleted file mode 100644 index 47630dd97b..0000000000 --- a/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S +++ /dev/null @@ -1,425 +0,0 @@ -/* memcmp/wmemcmp optimized with AVX2. - Copyright (C) 2017 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 - <http://www.gnu.org/licenses/>. */ - -#if IS_IN (libc) - -/* memcmp/wmemcmp is implemented as: - 1. For size from 2 to 7 bytes, load as big endian with movbe and bswap - to avoid branches. - 2. Use overlapping compare to avoid branch. - 3. Use vector compare when size >= 4 bytes for memcmp or size >= 8 - bytes for wmemcmp. - 4. If size is 8 * VEC_SIZE or less, unroll the loop. - 5. Compare 4 * VEC_SIZE at a time with the aligned first memory - area. - 6. Use 2 vector compares when size is 2 * VEC_SIZE or less. - 7. Use 4 vector compares when size is 4 * VEC_SIZE or less. - 8. Use 8 vector compares when size is 8 * VEC_SIZE or less. */ - -# include <sysdep.h> - -# ifndef MEMCMP -# define MEMCMP __memcmp_avx2_movbe -# endif - -# ifdef USE_AS_WMEMCMP -# define VPCMPEQ vpcmpeqd -# else -# define VPCMPEQ vpcmpeqb -# endif - -# ifndef VZEROUPPER -# define VZEROUPPER vzeroupper -# endif - -# define VEC_SIZE 32 -# define VEC_MASK ((1 << VEC_SIZE) - 1) - -/* Warning! - wmemcmp has to use SIGNED comparison for elements. - memcmp has to use UNSIGNED comparison for elemnts. -*/ - - .section .text.avx,"ax",@progbits -ENTRY (MEMCMP) -# ifdef USE_AS_WMEMCMP - shl $2, %rdx -# endif - cmpq $VEC_SIZE, %rdx - jb L(less_vec) - cmpq $(VEC_SIZE * 2), %rdx - ja L(more_2x_vec) - -L(last_2x_vec): - /* From VEC to 2 * VEC. No branch when size == VEC_SIZE. */ - vmovdqu (%rsi), %ymm2 - VPCMPEQ (%rdi), %ymm2, %ymm2 - vpmovmskb %ymm2, %eax - subl $VEC_MASK, %eax - jnz L(first_vec) - -L(last_vec): - /* Use overlapping loads to avoid branches. */ - leaq -VEC_SIZE(%rdi, %rdx), %rdi - leaq -VEC_SIZE(%rsi, %rdx), %rsi - vmovdqu (%rsi), %ymm2 - VPCMPEQ (%rdi), %ymm2, %ymm2 - vpmovmskb %ymm2, %eax - subl $VEC_MASK, %eax - jnz L(first_vec) - VZEROUPPER - ret - - .p2align 4 -L(first_vec): - /* A byte or int32 is different within 16 or 32 bytes. */ - tzcntl %eax, %ecx -# ifdef USE_AS_WMEMCMP - xorl %eax, %eax - movl (%rdi, %rcx), %edx - cmpl (%rsi, %rcx), %edx -L(wmemcmp_return): - setl %al - negl %eax - orl $1, %eax -# else - movzbl (%rdi, %rcx), %eax - movzbl (%rsi, %rcx), %edx - sub %edx, %eax -# endif - VZEROUPPER - ret - -# ifdef USE_AS_WMEMCMP - .p2align 4 -L(4): - xorl %eax, %eax - movl (%rdi), %edx - cmpl (%rsi), %edx - jne L(wmemcmp_return) - ret -# else - .p2align 4 -L(between_4_7): - /* Load as big endian with overlapping movbe to avoid branches. */ - movbe (%rdi), %eax - movbe (%rsi), %ecx - shlq $32, %rax - shlq $32, %rcx - movbe -4(%rdi, %rdx), %edi - movbe -4(%rsi, %rdx), %esi - orq %rdi, %rax - orq %rsi, %rcx - subq %rcx, %rax - je L(exit) - sbbl %eax, %eax - orl $1, %eax - ret - - .p2align 4 -L(exit): - ret - - .p2align 4 -L(between_2_3): - /* Load as big endian with overlapping loads and bswap to avoid - branches. */ - movzwl -2(%rdi, %rdx), %eax - movzwl -2(%rsi, %rdx), %ecx - shll $16, %eax - shll $16, %ecx - movzwl (%rdi), %edi - movzwl (%rsi), %esi - orl %edi, %eax - orl %esi, %ecx - bswap %eax - bswap %ecx - subl %ecx, %eax - ret - - .p2align 4 -L(1): - movzbl (%rdi), %eax - movzbl (%rsi), %ecx - subl %ecx, %eax - ret -# endif - - .p2align 4 -L(zero): - xorl %eax, %eax - ret - - .p2align 4 -L(less_vec): -# ifdef USE_AS_WMEMCMP - /* It can only be 0, 4, 8, 12, 16, 20, 24, 28 bytes. */ - cmpb $4, %dl - je L(4) - jb L(zero) -# else - cmpb $1, %dl - je L(1) - jb L(zero) - cmpb $4, %dl - jb L(between_2_3) - cmpb $8, %dl - jb L(between_4_7) -# endif - cmpb $16, %dl - jae L(between_16_31) - /* It is between 8 and 15 bytes. */ - vmovq (%rdi), %xmm1 - vmovq (%rsi), %xmm2 - VPCMPEQ %xmm1, %xmm2, %xmm2 - vpmovmskb %xmm2, %eax - subl $0xffff, %eax - jnz L(first_vec) - /* Use overlapping loads to avoid branches. */ - leaq -8(%rdi, %rdx), %rdi - leaq -8(%rsi, %rdx), %rsi - vmovq (%rdi), %xmm1 - vmovq (%rsi), %xmm2 - VPCMPEQ %xmm1, %xmm2, %xmm2 - vpmovmskb %xmm2, %eax - subl $0xffff, %eax - jnz L(first_vec) - ret - - .p2align 4 -L(between_16_31): - /* From 16 to 31 bytes. No branch when size == 16. */ - vmovdqu (%rsi), %xmm2 - VPCMPEQ (%rdi), %xmm2, %xmm2 - vpmovmskb %xmm2, %eax - subl $0xffff, %eax - jnz L(first_vec) - - /* Use overlapping loads to avoid branches. */ - leaq -16(%rdi, %rdx), %rdi - leaq -16(%rsi, %rdx), %rsi - vmovdqu (%rsi), %xmm2 - VPCMPEQ (%rdi), %xmm2, %xmm2 - vpmovmskb %xmm2, %eax - subl $0xffff, %eax - jnz L(first_vec) - ret - - .p2align 4 -L(more_2x_vec): - /* More than 2 * VEC. */ - cmpq $(VEC_SIZE * 8), %rdx - ja L(more_8x_vec) - cmpq $(VEC_SIZE * 4), %rdx - jb L(last_4x_vec) - - /* From 4 * VEC to 8 * VEC, inclusively. */ - vmovdqu (%rsi), %ymm1 - VPCMPEQ (%rdi), %ymm1, %ymm1 - - vmovdqu VEC_SIZE(%rsi), %ymm2 - VPCMPEQ VEC_SIZE(%rdi), %ymm2, %ymm2 - - vmovdqu (VEC_SIZE * 2)(%rsi), %ymm3 - VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm3, %ymm3 - - vmovdqu (VEC_SIZE * 3)(%rsi), %ymm4 - VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm4, %ymm4 - - vpand %ymm1, %ymm2, %ymm5 - vpand %ymm3, %ymm4, %ymm6 - vpand %ymm5, %ymm6, %ymm5 - - vpmovmskb %ymm5, %eax - subl $VEC_MASK, %eax - jnz L(4x_vec_end) - - leaq -(4 * VEC_SIZE)(%rdi, %rdx), %rdi - leaq -(4 * VEC_SIZE)(%rsi, %rdx), %rsi - vmovdqu (%rsi), %ymm1 - VPCMPEQ (%rdi), %ymm1, %ymm1 - - vmovdqu VEC_SIZE(%rsi), %ymm2 - VPCMPEQ VEC_SIZE(%rdi), %ymm2, %ymm2 - vpand %ymm2, %ymm1, %ymm5 - - vmovdqu (VEC_SIZE * 2)(%rsi), %ymm3 - VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm3, %ymm3 - vpand %ymm3, %ymm5, %ymm5 - - vmovdqu (VEC_SIZE * 3)(%rsi), %ymm4 - VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm4, %ymm4 - vpand %ymm4, %ymm5, %ymm5 - - vpmovmskb %ymm5, %eax - subl $VEC_MASK, %eax - jnz L(4x_vec_end) - VZEROUPPER - ret - - .p2align 4 -L(more_8x_vec): - /* More than 8 * VEC. Check the first VEC. */ - vmovdqu (%rsi), %ymm2 - VPCMPEQ (%rdi), %ymm2, %ymm2 - vpmovmskb %ymm2, %eax - subl $VEC_MASK, %eax - jnz L(first_vec) - - /* Align the first memory area for aligned loads in the loop. - Compute how much the first memory area is misaligned. */ - movq %rdi, %rcx - andl $(VEC_SIZE - 1), %ecx - /* Get the negative of offset for alignment. */ - subq $VEC_SIZE, %rcx - /* Adjust the second memory area. */ - subq %rcx, %rsi - /* Adjust the first memory area which should be aligned now. */ - subq %rcx, %rdi - /* Adjust length. */ - addq %rcx, %rdx - -L(loop_4x_vec): - /* Compare 4 * VEC at a time forward. */ - vmovdqu (%rsi), %ymm1 - VPCMPEQ (%rdi), %ymm1, %ymm1 - - vmovdqu VEC_SIZE(%rsi), %ymm2 - VPCMPEQ VEC_SIZE(%rdi), %ymm2, %ymm2 - vpand %ymm2, %ymm1, %ymm5 - - vmovdqu (VEC_SIZE * 2)(%rsi), %ymm3 - VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm3, %ymm3 - vpand %ymm3, %ymm5, %ymm5 - - vmovdqu (VEC_SIZE * 3)(%rsi), %ymm4 - VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm4, %ymm4 - vpand %ymm4, %ymm5, %ymm5 - - vpmovmskb %ymm5, %eax - subl $VEC_MASK, %eax - jnz L(4x_vec_end) - - addq $(VEC_SIZE * 4), %rdi - addq $(VEC_SIZE * 4), %rsi - - subq $(VEC_SIZE * 4), %rdx - cmpq $(VEC_SIZE * 4), %rdx - jae L(loop_4x_vec) - - /* Less than 4 * VEC. */ - cmpq $VEC_SIZE, %rdx - jbe L(last_vec) - cmpq $(VEC_SIZE * 2), %rdx - jbe L(last_2x_vec) - -L(last_4x_vec): - /* From 2 * VEC to 4 * VEC. */ - vmovdqu (%rsi), %ymm2 - VPCMPEQ (%rdi), %ymm2, %ymm2 - vpmovmskb %ymm2, %eax - subl $VEC_MASK, %eax - jnz L(first_vec) - - addq $VEC_SIZE, %rdi - addq $VEC_SIZE, %rsi - vmovdqu (%rsi), %ymm2 - VPCMPEQ (%rdi), %ymm2, %ymm2 - vpmovmskb %ymm2, %eax - subl $VEC_MASK, %eax - jnz L(first_vec) - - /* Use overlapping loads to avoid branches. */ - leaq -(3 * VEC_SIZE)(%rdi, %rdx), %rdi - leaq -(3 * VEC_SIZE)(%rsi, %rdx), %rsi - vmovdqu (%rsi), %ymm2 - VPCMPEQ (%rdi), %ymm2, %ymm2 - vpmovmskb %ymm2, %eax - subl $VEC_MASK, %eax - jnz L(first_vec) - - addq $VEC_SIZE, %rdi - addq $VEC_SIZE, %rsi - vmovdqu (%rsi), %ymm2 - VPCMPEQ (%rdi), %ymm2, %ymm2 - vpmovmskb %ymm2, %eax - subl $VEC_MASK, %eax - jnz L(first_vec) - VZEROUPPER - ret - - .p2align 4 -L(4x_vec_end): - vpmovmskb %ymm1, %eax - subl $VEC_MASK, %eax - jnz L(first_vec) - vpmovmskb %ymm2, %eax - subl $VEC_MASK, %eax - jnz L(first_vec_x1) - vpmovmskb %ymm3, %eax - subl $VEC_MASK, %eax - jnz L(first_vec_x2) - vpmovmskb %ymm4, %eax - subl $VEC_MASK, %eax - tzcntl %eax, %ecx -# ifdef USE_AS_WMEMCMP - xorl %eax, %eax - movl (VEC_SIZE * 3)(%rdi, %rcx), %edx - cmpl (VEC_SIZE * 3)(%rsi, %rcx), %edx - jmp L(wmemcmp_return) -# else - movzbl (VEC_SIZE * 3)(%rdi, %rcx), %eax - movzbl (VEC_SIZE * 3)(%rsi, %rcx), %edx - sub %edx, %eax -# endif - VZEROUPPER - ret - - .p2align 4 -L(first_vec_x1): - tzcntl %eax, %ecx -# ifdef USE_AS_WMEMCMP - xorl %eax, %eax - movl VEC_SIZE(%rdi, %rcx), %edx - cmpl VEC_SIZE(%rsi, %rcx), %edx - jmp L(wmemcmp_return) -# else - movzbl VEC_SIZE(%rdi, %rcx), %eax - movzbl VEC_SIZE(%rsi, %rcx), %edx - sub %edx, %eax -# endif - VZEROUPPER - ret - - .p2align 4 -L(first_vec_x2): - tzcntl %eax, %ecx -# ifdef USE_AS_WMEMCMP - xorl %eax, %eax - movl (VEC_SIZE * 2)(%rdi, %rcx), %edx - cmpl (VEC_SIZE * 2)(%rsi, %rcx), %edx - jmp L(wmemcmp_return) -# else - movzbl (VEC_SIZE * 2)(%rdi, %rcx), %eax - movzbl (VEC_SIZE * 2)(%rsi, %rcx), %edx - sub %edx, %eax -# endif - VZEROUPPER - ret -END (MEMCMP) -#endif |