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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-06-29 16:11:22 -0700 |
|---|---|---|
| committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-07-05 16:42:42 -0700 |
| commit | ae308947ff0fa950431d53bcc90c875295d57715 (patch) | |
| tree | d14ede08a3dae637cdd57410d42e3dcf00624e2c /sysdeps | |
| parent | 37ecc657b22c3367a56df5ebd53908e34e65fa16 (diff) | |
| download | glibc-ae308947ff0fa950431d53bcc90c875295d57715.zip glibc-ae308947ff0fa950431d53bcc90c875295d57715.tar.gz glibc-ae308947ff0fa950431d53bcc90c875295d57715.tar.bz2 | |
x86: Add support for building {w}memcmp{eq} with explicit ISA level
1. Refactor files so that all implementations are in the multiarch
directory
- Moved the implementation portion of memcmp sse2 from memcmp.S to
multiarch/memcmp-sse2.S
- The non-multiarch file now only includes one of the
implementations in the multiarch directory based on the compiled
ISA level (only used for non-multiarch builds. Otherwise we go
through the ifunc selector).
2. Add ISA level build guards to different implementations.
- I.e memcmp-avx2-movsb.S which is ISA level 3 will only build if
compiled ISA level <= 3. Otherwise there is no reason to include
it as we will always use one of the ISA level 4
implementations (memcmp-evex-movbe.S).
3. Add new multiarch/rtld-{w}memcmp{eq}.S that just include the
non-multiarch {w}memcmp{eq}.S which will in turn select the best
implementation based on the compiled ISA level.
4. Refactor the ifunc selector and ifunc implementation list to use
the ISA level aware wrapper macros that allow functions below the
compiled ISA level (with a guranteed replacement) to be skipped.
Tested with and without multiarch on x86_64 for ISA levels:
{generic, x86-64-v2, x86-64-v3, x86-64-v4}
And m32 with and without multiarch.
Diffstat (limited to 'sysdeps')
20 files changed, 790 insertions, 661 deletions
diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c index 58f7a7f..94f4fbf 100644 --- a/sysdeps/x86/cpu-tunables.c +++ b/sysdeps/x86/cpu-tunables.c @@ -30,7 +30,8 @@ since IFUNC must be set up by init_cpu_features. */ # if defined USE_MULTIARCH && !defined SHARED # ifdef __x86_64__ -# define DEFAULT_MEMCMP __memcmp_sse2 +/* DEFAULT_MEMCMP by sysdeps/x86_64/memcmp-isa-default-impl.h. */ +# include <sysdeps/x86_64/memcmp-isa-default-impl.h> # else # define DEFAULT_MEMCMP __memcmp_ia32 # endif diff --git a/sysdeps/x86_64/memcmp-isa-default-impl.h b/sysdeps/x86_64/memcmp-isa-default-impl.h new file mode 100644 index 0000000..1e18d15 --- /dev/null +++ b/sysdeps/x86_64/memcmp-isa-default-impl.h @@ -0,0 +1,28 @@ +/* Set default memcmp impl based on ISA level. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <isa-level.h> +#if MINIMUM_X86_ISA_LEVEL == 1 || MINIMUM_X86_ISA_LEVEL == 2 +# define DEFAULT_MEMCMP __memcmp_sse2 +#elif MINIMUM_X86_ISA_LEVEL == 3 +# define DEFAULT_MEMCMP __memcmp_avx2_movbe +#elif MINIMUM_X86_ISA_LEVEL == 4 +# define DEFAULT_MEMCMP __memcmp_evex_movbe +#else +# error "Unknown default memcmp implementation" +#endif diff --git a/sysdeps/x86_64/memcmp.S b/sysdeps/x86_64/memcmp.S index 5718a7d..2623ed6 100644 --- a/sysdeps/x86_64/memcmp.S +++ b/sysdeps/x86_64/memcmp.S @@ -1,4 +1,4 @@ -/* memcmp with SSE2 +/* memcmp hook for non-multiarch and RTLD build. Copyright (C) 2009-2022 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -16,563 +16,13 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#include <sysdep.h> +#define MEMCMP memcmp -#ifdef USE_AS_WMEMCMP -# define PCMPEQ pcmpeqd -# define CHAR_SIZE 4 -# define SIZE_OFFSET (0) -#else -# define PCMPEQ pcmpeqb -# define CHAR_SIZE 1 -#endif +#define DEFAULT_IMPL_V1 "multiarch/memcmp-sse2.S" +#define DEFAULT_IMPL_V3 "multiarch/memcmp-avx2-movbe.S" +#define DEFAULT_IMPL_V4 "multiarch/memcmp-evex-movbe.S" -#ifdef USE_AS_MEMCMPEQ -# define SIZE_OFFSET (0) -# define CHECK_CMP(x, y) subl x, y -#else -# ifndef SIZE_OFFSET -# define SIZE_OFFSET (CHAR_PER_VEC * 2) -# endif -# define CHECK_CMP(x, y) cmpl x, y -#endif +#include "isa-default-impl.h" -#define VEC_SIZE 16 -#define CHAR_PER_VEC (VEC_SIZE / CHAR_SIZE) - -#ifndef MEMCMP -# define MEMCMP memcmp -#endif - - .text -ENTRY(MEMCMP) -# ifdef __ILP32__ - /* Clear the upper 32 bits. */ - movl %edx, %edx -# endif -#ifdef USE_AS_WMEMCMP - /* Use 0xffff to test for mismatches on pmovmskb bitmask. Store - in ecx for code size. This is preferable to using `incw` as - it avoids partial register stalls on older hardware (pre - SnB). */ - movl $0xffff, %ecx -#endif - cmpq $CHAR_PER_VEC, %rdx - ja L(more_1x_vec) - -#ifdef USE_AS_WMEMCMP - /* saves a byte of code keeping the fall through path n = [2, 4] - in the initial cache line. */ - decl %edx - jle L(cmp_0_1) - - movq (%rsi), %xmm0 - movq (%rdi), %xmm1 - PCMPEQ %xmm0, %xmm1 - pmovmskb %xmm1, %eax - subl %ecx, %eax - jnz L(ret_nonzero_vec_start_0) - - movq -4(%rsi, %rdx, CHAR_SIZE), %xmm0 - movq -4(%rdi, %rdx, CHAR_SIZE), %xmm1 - PCMPEQ %xmm0, %xmm1 - pmovmskb %xmm1, %eax - subl %ecx, %eax - jnz L(ret_nonzero_vec_end_0_adj) -#else - cmpl $8, %edx - ja L(cmp_9_16) - - cmpl $4, %edx - jb L(cmp_0_3) - -# ifdef USE_AS_MEMCMPEQ - movl (%rsi), %eax - subl (%rdi), %eax - - movl -4(%rsi, %rdx), %esi - subl -4(%rdi, %rdx), %esi - - orl %esi, %eax - ret -# else - /* Combine comparisons for lo and hi 4-byte comparisons. */ - movl -4(%rsi, %rdx), %ecx - movl -4(%rdi, %rdx), %eax - shlq $32, %rcx - shlq $32, %rax - movl (%rsi), %esi - movl (%rdi), %edi - orq %rsi, %rcx - orq %rdi, %rax - /* Only compute proper return if not-equal. */ - cmpq %rcx, %rax - jnz L(ret_nonzero) - xorl %eax, %eax - ret -# endif - - .p2align 4,, 10 -L(cmp_9_16): -# ifdef USE_AS_MEMCMPEQ - movq (%rsi), %rax - subq (%rdi), %rax - - movq -8(%rsi, %rdx), %rcx - subq -8(%rdi, %rdx), %rcx - orq %rcx, %rax - /* Convert 64 bit -> 32 bit boolean (we should have made the ABI - return long). */ - setnz %cl - movzbl %cl, %eax -# else - movq (%rsi), %rcx - movq (%rdi), %rax - /* Only compute proper return if not-equal. */ - cmpq %rcx, %rax - jnz L(ret_nonzero) - - movq -8(%rsi, %rdx, CHAR_SIZE), %rcx - movq -8(%rdi, %rdx, CHAR_SIZE), %rax - /* Only compute proper return if not-equal. */ - cmpq %rcx, %rax - jnz L(ret_nonzero) - xorl %eax, %eax -# endif -#endif - ret - - .p2align 4,, 8 -L(cmp_0_1): - /* Flag set by earlier comparison against 1. */ - jne L(cmp_0_0) -#ifdef USE_AS_WMEMCMP - movl (%rdi), %ecx - xorl %edx, %edx - cmpl (%rsi), %ecx - je L(cmp_0_0) - setg %dl - leal -1(%rdx, %rdx), %eax -#else - movzbl (%rdi), %eax - movzbl (%rsi), %ecx - subl %ecx, %eax -#endif - ret - - /* Fits in aligning bytes. */ -L(cmp_0_0): - xorl %eax, %eax - ret - -#ifdef USE_AS_WMEMCMP - .p2align 4 -L(ret_nonzero_vec_start_0): - bsfl %eax, %eax - movl (%rdi, %rax), %ecx - xorl %edx, %edx - cmpl (%rsi, %rax), %ecx - /* NB: no partial register stall here because xorl zero idiom - above. */ - setg %dl - leal -1(%rdx, %rdx), %eax - ret -#else - -# ifndef USE_AS_MEMCMPEQ - .p2align 4,, 14 -L(ret_nonzero): - /* Need to bswap to get proper return without branch. */ - bswapq %rcx - bswapq %rax - subq %rcx, %rax - sbbl %eax, %eax - orl $1, %eax - ret -# endif - - .p2align 4 -L(cmp_0_3): -# ifdef USE_AS_MEMCMPEQ - /* No reason to add to dependency chain on rdx. Saving a the - bytes here doesn't change number of fetch blocks. */ - cmpl $1, %edx - jbe L(cmp_0_1) -# else - /* We need the code size to prevent taking an extra fetch block. - */ - decl %edx - jle L(cmp_0_1) -# endif - movzwl (%rsi), %ecx - movzwl (%rdi), %eax - -# ifdef USE_AS_MEMCMPEQ - subl %ecx, %eax - - movzbl -1(%rsi, %rdx), %esi - movzbl -1(%rdi, %rdx), %edi - subl %edi, %esi - orl %esi, %eax -# else - bswapl %ecx - bswapl %eax - - /* Implicit right shift by one. We just need to displace the - sign bits. */ - shrl %ecx - shrl %eax - - /* Eat a partial register stall here. Saves code stopping - L(cmp_0_3) from bleeding into the next fetch block and saves - an ALU. */ - movb (%rsi, %rdx), %cl - movzbl (%rdi, %rdx), %edi - orl %edi, %eax - subl %ecx, %eax -# endif - ret -#endif - - .p2align 5 -L(more_1x_vec): -#ifndef USE_AS_WMEMCMP - /* Use 0xffff to test for mismatches on pmovmskb bitmask. Store - in ecx for code size. This is preferable to using `incw` as - it avoids partial register stalls on older hardware (pre - SnB). */ - movl $0xffff, %ecx -#endif - movups (%rsi), %xmm0 - movups (%rdi), %xmm1 - PCMPEQ %xmm0, %xmm1 - pmovmskb %xmm1, %eax - subl %ecx, %eax - jnz L(ret_nonzero_vec_start_0) -#if SIZE_OFFSET == 0 - cmpq $(CHAR_PER_VEC * 2), %rdx -#else - /* Offset rdx. Saves just enough code size to keep the - L(last_2x_vec) case and the non-zero return in a single - cache line. */ - subq $(CHAR_PER_VEC * 2), %rdx -#endif - ja L(more_2x_vec) - - movups (VEC_SIZE * -1 + SIZE_OFFSET)(%rsi, %rdx, CHAR_SIZE), %xmm0 - movups (VEC_SIZE * -1 + SIZE_OFFSET)(%rdi, %rdx, CHAR_SIZE), %xmm1 - PCMPEQ %xmm0, %xmm1 - pmovmskb %xmm1, %eax - subl %ecx, %eax -#ifndef USE_AS_MEMCMPEQ - /* Don't use `incw ax` as machines this code runs on are liable - to have partial register stall. */ - jnz L(ret_nonzero_vec_end_0) -#else - /* Various return targets for memcmpeq. Will always be hot in - Icache and get short encoding. */ -L(ret_nonzero_vec_start_1): -L(ret_nonzero_vec_start_0): -L(ret_nonzero_vec_end_0): -#endif - ret - -#ifndef USE_AS_MEMCMPEQ -# ifdef USE_AS_WMEMCMP - .p2align 4 -L(ret_nonzero_vec_end_0_adj): - addl $3, %edx -# else - .p2align 4,, 8 -# endif -L(ret_nonzero_vec_end_0): - bsfl %eax, %eax -# ifdef USE_AS_WMEMCMP - leal (%rax, %rdx, CHAR_SIZE), %eax - movl (VEC_SIZE * -1 + SIZE_OFFSET)(%rdi, %rax), %ecx - xorl %edx, %edx - cmpl (VEC_SIZE * -1 + SIZE_OFFSET)(%rsi, %rax), %ecx - /* NB: no partial register stall here because xorl zero idiom - above. */ - setg %dl - leal -1(%rdx, %rdx), %eax -# else - addl %edx, %eax - movzbl (VEC_SIZE * -1 + SIZE_OFFSET)(%rsi, %rax), %ecx - movzbl (VEC_SIZE * -1 + SIZE_OFFSET)(%rdi, %rax), %eax - subl %ecx, %eax -# endif - ret -# ifndef USE_AS_WMEMCMP - .p2align 4,, 10 -L(ret_nonzero_vec_start_0): - bsfl %eax, %eax - movzbl (%rsi, %rax), %ecx - movzbl (%rdi, %rax), %eax - subl %ecx, %eax - ret -# endif -#else -#endif - - .p2align 5 -L(more_2x_vec): - movups (VEC_SIZE * 1)(%rsi), %xmm0 - movups (VEC_SIZE * 1)(%rdi), %xmm1 - PCMPEQ %xmm0, %xmm1 - pmovmskb %xmm1, %eax - subl %ecx, %eax - jnz L(ret_nonzero_vec_start_1) - - cmpq $(CHAR_PER_VEC * 4 - SIZE_OFFSET), %rdx - jbe L(last_2x_vec) - - cmpq $(CHAR_PER_VEC * 8 - SIZE_OFFSET), %rdx - ja L(more_8x_vec) - - /* Do comparisons for [65, 96] and [97, 128] 2x VEC at a time. - This can harm performance if non-zero return in [65, 80] or - [97, 112] but helps performance otherwise. Generally zero- - return is hotter. */ - movups (VEC_SIZE * 2)(%rsi), %xmm0 - movups (VEC_SIZE * 2)(%rdi), %xmm1 - PCMPEQ %xmm0, %xmm1 - movups (VEC_SIZE * 3)(%rsi), %xmm2 - movups (VEC_SIZE * 3)(%rdi), %xmm3 - PCMPEQ %xmm2, %xmm3 - pand %xmm1, %xmm3 - - pmovmskb %xmm3, %eax - CHECK_CMP (%ecx, %eax) - jnz L(ret_nonzero_vec_start_2_3) - - cmpl $(CHAR_PER_VEC * 6 - SIZE_OFFSET), %edx - jbe L(last_2x_vec) - - movups (VEC_SIZE * 4)(%rsi), %xmm0 - movups (VEC_SIZE * 4)(%rdi), %xmm1 - PCMPEQ %xmm0, %xmm1 - movups (VEC_SIZE * 5)(%rsi), %xmm2 - movups (VEC_SIZE * 5)(%rdi), %xmm3 - PCMPEQ %xmm2, %xmm3 - pand %xmm1, %xmm3 - - pmovmskb %xmm3, %eax - CHECK_CMP (%ecx, %eax) -#ifdef USE_AS_MEMCMPEQ - jz L(last_2x_vec) - ret -#else - jnz L(ret_nonzero_vec_start_4_5) -#endif - .p2align 4 -L(last_2x_vec): - movups (VEC_SIZE * -2 + SIZE_OFFSET)(%rsi, %rdx, CHAR_SIZE), %xmm0 - movups (VEC_SIZE * -2 + SIZE_OFFSET)(%rdi, %rdx, CHAR_SIZE), %xmm1 - PCMPEQ %xmm0, %xmm1 - movups (VEC_SIZE * -1 + SIZE_OFFSET)(%rsi, %rdx, CHAR_SIZE), %xmm2 - movups (VEC_SIZE * -1 + SIZE_OFFSET)(%rdi, %rdx, CHAR_SIZE), %xmm3 - PCMPEQ %xmm2, %xmm3 - pand %xmm1, %xmm3 - pmovmskb %xmm3, %eax - subl %ecx, %eax -#ifdef USE_AS_MEMCMPEQ - /* Various return targets for memcmpeq. Will always be hot in - Icache and get short encoding. */ -L(ret_nonzero_vec_start_2_3): -L(ret_nonzero_vec_start_4_5): - ret -#else - jnz L(ret_nonzero_vec_end_1) - ret - - .p2align 4,, 8 -L(ret_nonzero_vec_end_1): - pmovmskb %xmm1, %ecx - /* High 16 bits of eax guranteed to be all ones. Rotate them in - to we can do `or + not` with just `xor`. */ - rorl $16, %eax - xorl %ecx, %eax - /* Partial register stall. */ - - bsfl %eax, %eax -# ifdef USE_AS_WMEMCMP - leal (%rax, %rdx, CHAR_SIZE), %eax - movl (VEC_SIZE * -2 + SIZE_OFFSET)(%rdi, %rax), %ecx - xorl %edx, %edx - cmpl (VEC_SIZE * -2 + SIZE_OFFSET)(%rsi, %rax), %ecx - /* NB: no partial register stall here because xorl zero idiom - above. */ - setg %dl - leal -1(%rdx, %rdx), %eax -# else - addl %edx, %eax - movzbl (VEC_SIZE * -2 + SIZE_OFFSET)(%rsi, %rax), %ecx - movzbl (VEC_SIZE * -2 + SIZE_OFFSET)(%rdi, %rax), %eax - subl %ecx, %eax -# endif - ret - - .p2align 4 -L(ret_nonzero_vec_start_4_5): - pmovmskb %xmm1, %edx - sall $16, %eax - leal 1(%rax, %rdx), %eax - bsfl %eax, %eax -# ifdef USE_AS_WMEMCMP - movl (VEC_SIZE * 4)(%rdi, %rax), %ecx - xorl %edx, %edx - cmpl (VEC_SIZE * 4)(%rsi, %rax), %ecx - /* NB: no partial register stall here because xorl zero idiom - above. */ - setg %dl - leal -1(%rdx, %rdx), %eax -# else - movzbl (VEC_SIZE * 4)(%rsi, %rax), %ecx - movzbl (VEC_SIZE * 4)(%rdi, %rax), %eax - subl %ecx, %eax -# endif - ret - - .p2align 4,, 8 -L(ret_nonzero_vec_start_1): - bsfl %eax, %eax -# ifdef USE_AS_WMEMCMP - movl (VEC_SIZE * 1)(%rdi, %rax), %ecx - xorl %edx, %edx - cmpl (VEC_SIZE * 1)(%rsi, %rax), %ecx - /* NB: no partial register stall here because xorl zero idiom - above. */ - setg %dl - leal -1(%rdx, %rdx), %eax -# else - movzbl (VEC_SIZE * 1)(%rsi, %rax), %ecx - movzbl (VEC_SIZE * 1)(%rdi, %rax), %eax - subl %ecx, %eax -# endif - ret -#endif - - .p2align 4 -L(more_8x_vec): - subq %rdi, %rsi - leaq (VEC_SIZE * -6 + SIZE_OFFSET)(%rdi, %rdx, CHAR_SIZE), %rdx - andq $(VEC_SIZE * -1), %rdi - addq %rdi, %rsi - .p2align 4 -L(loop_4x): - movups (VEC_SIZE * 2)(%rsi), %xmm0 - movups (VEC_SIZE * 3)(%rsi), %xmm1 - - PCMPEQ (VEC_SIZE * 2)(%rdi), %xmm0 - PCMPEQ (VEC_SIZE * 3)(%rdi), %xmm1 - - movups (VEC_SIZE * 4)(%rsi), %xmm2 - movups (VEC_SIZE * 5)(%rsi), %xmm3 - - PCMPEQ (VEC_SIZE * 4)(%rdi), %xmm2 - PCMPEQ (VEC_SIZE * 5)(%rdi), %xmm3 - - pand %xmm0, %xmm1 - pand %xmm2, %xmm3 - pand %xmm1, %xmm3 - - pmovmskb %xmm3, %eax - subl %ecx, %eax - jnz L(ret_nonzero_loop) - - addq $(VEC_SIZE * 4), %rdi - addq $(VEC_SIZE * 4), %rsi - cmpq %rdi, %rdx - ja L(loop_4x) - /* Get remaining length in edx. */ - subl %edi, %edx - /* Restore offset so we can reuse L(last_2x_vec). */ - addl $(VEC_SIZE * 6 - SIZE_OFFSET), %edx -#ifdef USE_AS_WMEMCMP - shrl $2, %edx -#endif - cmpl $(CHAR_PER_VEC * 4 - SIZE_OFFSET), %edx - jbe L(last_2x_vec) - - - movups (VEC_SIZE * 2)(%rsi), %xmm0 - movups (VEC_SIZE * 2)(%rdi), %xmm1 - PCMPEQ %xmm0, %xmm1 - movups (VEC_SIZE * 3)(%rsi), %xmm2 - movups (VEC_SIZE * 3)(%rdi), %xmm3 - PCMPEQ %xmm2, %xmm3 - pand %xmm1, %xmm3 - - pmovmskb %xmm3, %eax - CHECK_CMP (%ecx, %eax) - jz L(last_2x_vec) -#ifdef USE_AS_MEMCMPEQ -L(ret_nonzero_loop): - ret -#else - - .p2align 4 -L(ret_nonzero_vec_start_2_3): - pmovmskb %xmm1, %edx - sall $16, %eax - leal 1(%rax, %rdx), %eax - - bsfl %eax, %eax -# ifdef USE_AS_WMEMCMP - movl (VEC_SIZE * 2)(%rdi, %rax), %ecx - xorl %edx, %edx - cmpl (VEC_SIZE * 2)(%rsi, %rax), %ecx - /* NB: no partial register stall here because xorl zero idiom - above. */ - setg %dl - leal -1(%rdx, %rdx), %eax -# else - movzbl (VEC_SIZE * 2)(%rsi, %rax), %ecx - movzbl (VEC_SIZE * 2)(%rdi, %rax), %eax - subl %ecx, %eax -# endif - ret - - .p2align 4 -L(ret_nonzero_loop): - pmovmskb %xmm0, %ecx - pmovmskb %xmm1, %edx - sall $(VEC_SIZE * 1), %edx - leal 1(%rcx, %rdx), %edx - pmovmskb %xmm2, %ecx - /* High 16 bits of eax guranteed to be all ones. Rotate them in - to we can do `or + not` with just `xor`. */ - rorl $16, %eax - xorl %ecx, %eax - - salq $32, %rax - orq %rdx, %rax - - bsfq %rax, %rax -# ifdef USE_AS_WMEMCMP - movl (VEC_SIZE * 2)(%rdi, %rax), %ecx - xorl %edx, %edx - cmpl (VEC_SIZE * 2)(%rsi, %rax), %ecx - /* NB: no partial register stall here because xorl zero idiom - above. */ - setg %dl - leal -1(%rdx, %rdx), %eax -# else - movzbl (VEC_SIZE * 2)(%rsi, %rax), %ecx - movzbl (VEC_SIZE * 2)(%rdi, %rax), %eax - subl %ecx, %eax -# endif - ret -#endif -END(MEMCMP) - -#ifndef USE_AS_WMEMCMP -# ifdef USE_AS_MEMCMPEQ -libc_hidden_def (MEMCMP) -# else -# undef bcmp -weak_alias (MEMCMP, bcmp) -libc_hidden_builtin_def (MEMCMP) -# endif -#endif +libc_hidden_builtin_def(memcmp) +weak_alias (memcmp, bcmp) diff --git a/sysdeps/x86_64/memcmpeq.S b/sysdeps/x86_64/memcmpeq.S index 80c5e91..d1e47e0 100644 --- a/sysdeps/x86_64/memcmpeq.S +++ b/sysdeps/x86_64/memcmpeq.S @@ -1,4 +1,4 @@ -/* __memcmpeq optimized with SSE2. +/* __memcmpeq hook for non-multiarch and RTLD build. Copyright (C) 2017-2022 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -16,6 +16,12 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#define MEMCMP __memcmpeq -#define USE_AS_MEMCMPEQ 1 -#include "multiarch/memcmp-sse2.S" +#define MEMCMPEQ __memcmpeq + +#define DEFAULT_IMPL_V1 "multiarch/memcmpeq-sse2.S" +#define DEFAULT_IMPL_V3 "multiarch/memcmpeq-avx2.S" +#define DEFAULT_IMPL_V4 "multiarch/memcmpeq-evex.S" + +#include "isa-default-impl.h" + +libc_hidden_def(__memcmpeq) diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c index 21008c7..adf7d4b 100644 --- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c +++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c @@ -36,21 +36,25 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/memcmpeq.c. */ IFUNC_IMPL (i, name, __memcmpeq, - IFUNC_IMPL_ADD (array, i, __memcmpeq, - (CPU_FEATURE_USABLE (AVX2) - && CPU_FEATURE_USABLE (BMI2)), - __memcmpeq_avx2) - IFUNC_IMPL_ADD (array, i, __memcmpeq, - (CPU_FEATURE_USABLE (AVX2) - && CPU_FEATURE_USABLE (BMI2) - && CPU_FEATURE_USABLE (RTM)), - __memcmpeq_avx2_rtm) - IFUNC_IMPL_ADD (array, i, __memcmpeq, - (CPU_FEATURE_USABLE (AVX512VL) - && CPU_FEATURE_USABLE (AVX512BW) - && CPU_FEATURE_USABLE (BMI2)), - __memcmpeq_evex) - IFUNC_IMPL_ADD (array, i, __memcmpeq, 1, __memcmpeq_sse2)) + X86_IFUNC_IMPL_ADD_V4 (array, i, __memcmpeq, + (CPU_FEATURE_USABLE (AVX512VL) + && CPU_FEATURE_USABLE (AVX512BW) + && CPU_FEATURE_USABLE (BMI2)), + __memcmpeq_evex) + X86_IFUNC_IMPL_ADD_V3 (array, i, __memcmpeq, + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2)), + __memcmpeq_avx2) + X86_IFUNC_IMPL_ADD_V3 (array, i, __memcmpeq, + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) + && CPU_FEATURE_USABLE (RTM)), + __memcmpeq_avx2_rtm) + /* ISA V2 wrapper for SSE2 implementation because the SSE2 + implementation is also used at ISA level 2. */ + X86_IFUNC_IMPL_ADD_V2 (array, i, __memcmpeq, + 1, + __memcmpeq_sse2)) /* Support sysdeps/x86_64/multiarch/memchr.c. */ IFUNC_IMPL (i, name, memchr, @@ -79,24 +83,31 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/memcmp.c. */ IFUNC_IMPL (i, name, memcmp, - IFUNC_IMPL_ADD (array, i, memcmp, - (CPU_FEATURE_USABLE (AVX2) - && CPU_FEATURE_USABLE (BMI2) - && CPU_FEATURE_USABLE (MOVBE)), - __memcmp_avx2_movbe) - IFUNC_IMPL_ADD (array, i, memcmp, - (CPU_FEATURE_USABLE (AVX2) - && CPU_FEATURE_USABLE (BMI2) - && CPU_FEATURE_USABLE (MOVBE) - && CPU_FEATURE_USABLE (RTM)), - __memcmp_avx2_movbe_rtm) - IFUNC_IMPL_ADD (array, i, memcmp, - (CPU_FEATURE_USABLE (AVX512VL) - && CPU_FEATURE_USABLE (AVX512BW) - && CPU_FEATURE_USABLE (BMI2) - && CPU_FEATURE_USABLE (MOVBE)), - __memcmp_evex_movbe) - IFUNC_IMPL_ADD (array, i, memcmp, 1, __memcmp_sse2)) + /* NB: If any of these names change or if any new + implementations are added be sure to update + sysdeps/x86_64/memcmp-isa-default-impl.h. */ + X86_IFUNC_IMPL_ADD_V4 (array, i, memcmp, + (CPU_FEATURE_USABLE (AVX512VL) + && CPU_FEATURE_USABLE (AVX512BW) + && CPU_FEATURE_USABLE (BMI2) + && CPU_FEATURE_USABLE (MOVBE)), + __memcmp_evex_movbe) + X86_IFUNC_IMPL_ADD_V3 (array, i, memcmp, + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) + && CPU_FEATURE_USABLE (MOVBE)), + __memcmp_avx2_movbe) + X86_IFUNC_IMPL_ADD_V3 (array, i, memcmp, + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) + && CPU_FEATURE_USABLE (MOVBE) + && CPU_FEATURE_USABLE (RTM)), + __memcmp_avx2_movbe_rtm) + /* ISA V2 wrapper for SSE2 implementation because the SSE2 + implementation is also used at ISA level 2. */ + X86_IFUNC_IMPL_ADD_V2 (array, i, memcmp, + 1, + __memcmp_sse2)) #ifdef SHARED /* Support sysdeps/x86_64/multiarch/memmove_chk.c. */ @@ -805,24 +816,28 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/wmemcmp.c. */ IFUNC_IMPL (i, name, wmemcmp, - IFUNC_IMPL_ADD (array, i, wmemcmp, - (CPU_FEATURE_USABLE (AVX2) - && CPU_FEATURE_USABLE (BMI2) - && CPU_FEATURE_USABLE (MOVBE)), - __wmemcmp_avx2_movbe) - IFUNC_IMPL_ADD (array, i, wmemcmp, - (CPU_FEATURE_USABLE (AVX2) - && CPU_FEATURE_USABLE (BMI2) - && CPU_FEATURE_USABLE (MOVBE) - && CPU_FEATURE_USABLE (RTM)), - __wmemcmp_avx2_movbe_rtm) - IFUNC_IMPL_ADD (array, i, wmemcmp, - (CPU_FEATURE_USABLE (AVX512VL) - && CPU_FEATURE_USABLE (AVX512BW) - && CPU_FEATURE_USABLE (BMI2) - && CPU_FEATURE_USABLE (MOVBE)), - __wmemcmp_evex_movbe) - IFUNC_IMPL_ADD (array, i, wmemcmp, 1, __wmemcmp_sse2)) + X86_IFUNC_IMPL_ADD_V4 (array, i, wmemcmp, + (CPU_FEATURE_USABLE (AVX512VL) + && CPU_FEATURE_USABLE (AVX512BW) + && CPU_FEATURE_USABLE (BMI2) + && CPU_FEATURE_USABLE (MOVBE)), + __wmemcmp_evex_movbe) + X86_IFUNC_IMPL_ADD_V3 (array, i, wmemcmp, + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) + && CPU_FEATURE_USABLE (MOVBE)), + __wmemcmp_avx2_movbe) + X86_IFUNC_IMPL_ADD_V3 (array, i, wmemcmp, + (CPU_FEATURE_USABLE (AVX2) + && CPU_FEATURE_USABLE (BMI2) + && CPU_FEATURE_USABLE (MOVBE) + && CPU_FEATURE_USABLE (RTM)), + __wmemcmp_avx2_movbe_rtm) + /* ISA V2 wrapper for SSE2 implementation because the SSE2 + implementation is also used at ISA level 2. */ + X86_IFUNC_IMPL_ADD_V2 (array, i, wmemcmp, + 1, + __wmemcmp_sse2)) /* Support sysdeps/x86_64/multiarch/wmemset.c. */ IFUNC_IMPL (i, name, wmemset, diff --git a/sysdeps/x86_64/multiarch/ifunc-memcmp.h b/sysdeps/x86_64/multiarch/ifunc-memcmp.h index c743970..27a1459 100644 --- a/sysdeps/x86_64/multiarch/ifunc-memcmp.h +++ b/sysdeps/x86_64/multiarch/ifunc-memcmp.h @@ -19,29 +19,33 @@ # include <init-arch.h> -extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden; +extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_movbe) attribute_hidden; + extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_movbe) attribute_hidden; extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_movbe_rtm) attribute_hidden; -extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_movbe) attribute_hidden; + +extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden; static inline void * IFUNC_SELECTOR (void) { - const struct cpu_features* cpu_features = __get_cpu_features (); + const struct cpu_features *cpu_features = __get_cpu_features (); - if (CPU_FEATURE_USABLE_P (cpu_features, AVX2) - && CPU_FEATURE_USABLE_P (cpu_features, MOVBE) - && CPU_FEATURE_USABLE_P (cpu_features, BMI2) - && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load)) + if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2) + && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, MOVBE) + && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2) + && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, + AVX_Fast_Unaligned_Load, )) { - if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL) - && CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)) + if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL) + && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)) return OPTIMIZE (evex_movbe); if (CPU_FEATURE_USABLE_P (cpu_features, RTM)) return OPTIMIZE (avx2_movbe_rtm); - if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)) + if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, + Prefer_No_VZEROUPPER, !)) return OPTIMIZE (avx2_movbe); } diff --git a/sysdeps/x86_64/multiarch/ifunc-memcmpeq.h b/sysdeps/x86_64/multiarch/ifunc-memcmpeq.h index aa01d48..fbcd2af 100644 --- a/sysdeps/x86_64/multiarch/ifunc-memcmpeq.h +++ b/sysdeps/x86_64/multiarch/ifunc-memcmpeq.h @@ -19,28 +19,32 @@ # include <init-arch.h> -extern __typeof (REDIRECT_NAME) OPTIMIZE1 (sse2) attribute_hidden; +extern __typeof (REDIRECT_NAME) OPTIMIZE1 (evex) attribute_hidden; + extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx2) attribute_hidden; extern __typeof (REDIRECT_NAME) OPTIMIZE1 (avx2_rtm) attribute_hidden; -extern __typeof (REDIRECT_NAME) OPTIMIZE1 (evex) attribute_hidden; + +extern __typeof (REDIRECT_NAME) OPTIMIZE1 (sse2) attribute_hidden; static inline void * IFUNC_SELECTOR (void) { - const struct cpu_features* cpu_features = __get_cpu_features (); + const struct cpu_features *cpu_features = __get_cpu_features (); - if (CPU_FEATURE_USABLE_P (cpu_features, AVX2) - && CPU_FEATURE_USABLE_P (cpu_features, BMI2) - && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load)) + if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2) + && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2) + && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, + AVX_Fast_Unaligned_Load, )) { - if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL) - && CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)) + if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL) + && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)) return OPTIMIZE1 (evex); if (CPU_FEATURE_USABLE_P (cpu_features, RTM)) return OPTIMIZE1 (avx2_rtm); - if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)) + if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, + Prefer_No_VZEROUPPER, !)) return OPTIMIZE1 (avx2); } diff --git a/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S b/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S index 210c992..48afeea 100644 --- a/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S +++ b/sysdeps/x86_64/multiarch/memcmp-avx2-movbe.S @@ -16,7 +16,9 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#if IS_IN (libc) +#include <isa-level.h> + +#if ISA_SHOULD_BUILD (3) /* memcmp/wmemcmp is implemented as: 1. Use ymm vector compares when possible. The only case where diff --git a/sysdeps/x86_64/multiarch/memcmp-evex-movbe.S b/sysdeps/x86_64/multiarch/memcmp-evex-movbe.S index aa03aee..bc01776 100644 --- a/sysdeps/x86_64/multiarch/memcmp-evex-movbe.S +++ b/sysdeps/x86_64/multiarch/memcmp-evex-movbe.S @@ -16,7 +16,10 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#if IS_IN (libc) +#include <isa-level.h> + +#if ISA_SHOULD_BUILD (4) + /* memcmp/wmemcmp is implemented as: 1. Use ymm vector compares when possible. The only case where diff --git a/sysdeps/x86_64/multiarch/memcmp-sse2.S b/sysdeps/x86_64/multiarch/memcmp-sse2.S index 4080fc1..afd450d 100644 --- a/sysdeps/x86_64/multiarch/memcmp-sse2.S +++ b/sysdeps/x86_64/multiarch/memcmp-sse2.S @@ -16,24 +16,565 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#if IS_IN (libc) + +#include <isa-level.h> + +/* MINIMUM_X86_ISA_LEVEL <= 2 because there is no V2 implementation + so we need this to build for ISA V2 builds. */ +#if ISA_SHOULD_BUILD (2) + +#include <sysdep.h> + # ifndef MEMCMP # define MEMCMP __memcmp_sse2 # endif -# ifdef SHARED -# undef libc_hidden_builtin_def -# define libc_hidden_builtin_def(name) +# ifdef USE_AS_WMEMCMP +# define PCMPEQ pcmpeqd +# define CHAR_SIZE 4 +# define SIZE_OFFSET (0) +# else +# define PCMPEQ pcmpeqb +# define CHAR_SIZE 1 +# endif -# undef libc_hidden_def -# define libc_hidden_def(ignored) +# ifdef USE_AS_MEMCMPEQ +# define SIZE_OFFSET (0) +# define CHECK_CMP(x, y) subl x, y +# else +# ifndef SIZE_OFFSET +# define SIZE_OFFSET (CHAR_PER_VEC * 2) +# endif +# define CHECK_CMP(x, y) cmpl x, y # endif -# undef weak_alias -# define weak_alias(ignored1, ignored2) +# define VEC_SIZE 16 +# define CHAR_PER_VEC (VEC_SIZE / CHAR_SIZE) -# undef strong_alias -# define strong_alias(ignored1, ignored2) -#endif +# ifndef MEMCMP +# define MEMCMP memcmp +# endif + + .text +ENTRY(MEMCMP) +# ifdef __ILP32__ + /* Clear the upper 32 bits. */ + movl %edx, %edx +# endif +# ifdef USE_AS_WMEMCMP + /* Use 0xffff to test for mismatches on pmovmskb bitmask. Store + in ecx for code size. This is preferable to using `incw` as + it avoids partial register stalls on older hardware (pre + SnB). */ + movl $0xffff, %ecx +# endif + cmpq $CHAR_PER_VEC, %rdx + ja L(more_1x_vec) + +# ifdef USE_AS_WMEMCMP + /* saves a byte of code keeping the fall through path n = [2, 4] + in the initial cache line. */ + decl %edx + jle L(cmp_0_1) + + movq (%rsi), %xmm0 + movq (%rdi), %xmm1 + PCMPEQ %xmm0, %xmm1 + pmovmskb %xmm1, %eax + subl %ecx, %eax + jnz L(ret_nonzero_vec_start_0) + + movq -4(%rsi, %rdx, CHAR_SIZE), %xmm0 + movq -4(%rdi, %rdx, CHAR_SIZE), %xmm1 + PCMPEQ %xmm0, %xmm1 + pmovmskb %xmm1, %eax + subl %ecx, %eax + jnz L(ret_nonzero_vec_end_0_adj) +# else + cmpl $8, %edx + ja L(cmp_9_16) + + cmpl $4, %edx + jb L(cmp_0_3) + +# ifdef USE_AS_MEMCMPEQ + movl (%rsi), %eax + subl (%rdi), %eax + + movl -4(%rsi, %rdx), %esi + subl -4(%rdi, %rdx), %esi + + orl %esi, %eax + ret +# else + /* Combine comparisons for lo and hi 4-byte comparisons. */ + movl -4(%rsi, %rdx), %ecx + movl -4(%rdi, %rdx), %eax + shlq $32, %rcx + shlq $32, %rax + movl (%rsi), %esi + movl (%rdi), %edi + orq %rsi, %rcx + orq %rdi, %rax + /* Only compute proper return if not-equal. */ + cmpq %rcx, %rax + jnz L(ret_nonzero) + xorl %eax, %eax + ret +# endif + + .p2align 4,, 10 +L(cmp_9_16): +# ifdef USE_AS_MEMCMPEQ + movq (%rsi), %rax + subq (%rdi), %rax + + movq -8(%rsi, %rdx), %rcx + subq -8(%rdi, %rdx), %rcx + orq %rcx, %rax + /* Convert 64 bit -> 32 bit boolean (we should have made the ABI + return long). */ + setnz %cl + movzbl %cl, %eax +# else + movq (%rsi), %rcx + movq (%rdi), %rax + /* Only compute proper return if not-equal. */ + cmpq %rcx, %rax + jnz L(ret_nonzero) + + movq -8(%rsi, %rdx, CHAR_SIZE), %rcx + movq -8(%rdi, %rdx, CHAR_SIZE), %rax + /* Only compute proper return if not-equal. */ + cmpq %rcx, %rax + jnz L(ret_nonzero) + xorl %eax, %eax +# endif +# endif + ret + + .p2align 4,, 8 +L(cmp_0_1): + /* Flag set by earlier comparison against 1. */ + jne L(cmp_0_0) +# ifdef USE_AS_WMEMCMP + movl (%rdi), %ecx + xorl %edx, %edx + cmpl (%rsi), %ecx + je L(cmp_0_0) + setg %dl + leal -1(%rdx, %rdx), %eax +# else + movzbl (%rdi), %eax + movzbl (%rsi), %ecx + subl %ecx, %eax +# endif + ret + + /* Fits in aligning bytes. */ +L(cmp_0_0): + xorl %eax, %eax + ret + +# ifdef USE_AS_WMEMCMP + .p2align 4 +L(ret_nonzero_vec_start_0): + bsfl %eax, %eax + movl (%rdi, %rax), %ecx + xorl %edx, %edx + cmpl (%rsi, %rax), %ecx + /* NB: no partial register stall here because xorl zero idiom + above. */ + setg %dl + leal -1(%rdx, %rdx), %eax + ret +# else + +# ifndef USE_AS_MEMCMPEQ + .p2align 4,, 14 +L(ret_nonzero): + /* Need to bswap to get proper return without branch. */ + bswapq %rcx + bswapq %rax + subq %rcx, %rax + sbbl %eax, %eax + orl $1, %eax + ret +# endif + + .p2align 4 +L(cmp_0_3): +# ifdef USE_AS_MEMCMPEQ + /* No reason to add to dependency chain on rdx. Saving a the + bytes here doesn't change number of fetch blocks. */ + cmpl $1, %edx + jbe L(cmp_0_1) +# else + /* We need the code size to prevent taking an extra fetch block. + */ + decl %edx + jle L(cmp_0_1) +# endif + movzwl (%rsi), %ecx + movzwl (%rdi), %eax + +# ifdef USE_AS_MEMCMPEQ + subl %ecx, %eax + + movzbl -1(%rsi, %rdx), %esi + movzbl -1(%rdi, %rdx), %edi + subl %edi, %esi + orl %esi, %eax +# else + bswapl %ecx + bswapl %eax + + /* Implicit right shift by one. We just need to displace the + sign bits. */ + shrl %ecx + shrl %eax + + /* Eat a partial register stall here. Saves code stopping + L(cmp_0_3) from bleeding into the next fetch block and saves + an ALU. */ + movb (%rsi, %rdx), %cl + movzbl (%rdi, %rdx), %edi + orl %edi, %eax + subl %ecx, %eax +# endif + ret +# endif + + .p2align 5 +L(more_1x_vec): +# ifndef USE_AS_WMEMCMP + /* Use 0xffff to test for mismatches on pmovmskb bitmask. Store + in ecx for code size. This is preferable to using `incw` as + it avoids partial register stalls on older hardware (pre + SnB). */ + movl $0xffff, %ecx +# endif + movups (%rsi), %xmm0 + movups (%rdi), %xmm1 + PCMPEQ %xmm0, %xmm1 + pmovmskb %xmm1, %eax + subl %ecx, %eax + jnz L(ret_nonzero_vec_start_0) +# if SIZE_OFFSET == 0 + cmpq $(CHAR_PER_VEC * 2), %rdx +# else + /* Offset rdx. Saves just enough code size to keep the + L(last_2x_vec) case and the non-zero return in a single + cache line. */ + subq $(CHAR_PER_VEC * 2), %rdx +# endif + ja L(more_2x_vec) -#include <sysdeps/x86_64/memcmp.S> + movups (VEC_SIZE * -1 + SIZE_OFFSET)(%rsi, %rdx, CHAR_SIZE), %xmm0 + movups (VEC_SIZE * -1 + SIZE_OFFSET)(%rdi, %rdx, CHAR_SIZE), %xmm1 + PCMPEQ %xmm0, %xmm1 + pmovmskb %xmm1, %eax + subl %ecx, %eax +# ifndef USE_AS_MEMCMPEQ + /* Don't use `incw ax` as machines this code runs on are liable + to have partial register stall. */ + jnz L(ret_nonzero_vec_end_0) +# else + /* Various return targets for memcmpeq. Will always be hot in + Icache and get short encoding. */ +L(ret_nonzero_vec_start_1): +L(ret_nonzero_vec_start_0): +L(ret_nonzero_vec_end_0): +# endif + ret + +# ifndef USE_AS_MEMCMPEQ +# ifdef USE_AS_WMEMCMP + .p2align 4 +L(ret_nonzero_vec_end_0_adj): + addl $3, %edx +# else + .p2align 4,, 8 +# endif +L(ret_nonzero_vec_end_0): + bsfl %eax, %eax +# ifdef USE_AS_WMEMCMP + leal (%rax, %rdx, CHAR_SIZE), %eax + movl (VEC_SIZE * -1 + SIZE_OFFSET)(%rdi, %rax), %ecx + xorl %edx, %edx + cmpl (VEC_SIZE * -1 + SIZE_OFFSET)(%rsi, %rax), %ecx + /* NB: no partial register stall here because xorl zero idiom + above. */ + setg %dl + leal -1(%rdx, %rdx), %eax +# else + addl %edx, %eax + movzbl (VEC_SIZE * -1 + SIZE_OFFSET)(%rsi, %rax), %ecx + movzbl (VEC_SIZE * -1 + SIZE_OFFSET)(%rdi, %rax), %eax + subl %ecx, %eax +# endif + ret +# ifndef USE_AS_WMEMCMP + .p2align 4,, 10 +L(ret_nonzero_vec_start_0): + bsfl %eax, %eax + movzbl (%rsi, %rax), %ecx + movzbl (%rdi, %rax), %eax + subl %ecx, %eax + ret +# endif +# else +# endif + + .p2align 5 +L(more_2x_vec): + movups (VEC_SIZE * 1)(%rsi), %xmm0 + movups (VEC_SIZE * 1)(%rdi), %xmm1 + PCMPEQ %xmm0, %xmm1 + pmovmskb %xmm1, %eax + subl %ecx, %eax + jnz L(ret_nonzero_vec_start_1) + + cmpq $(CHAR_PER_VEC * 4 - SIZE_OFFSET), %rdx + jbe L(last_2x_vec) + + cmpq $(CHAR_PER_VEC * 8 - SIZE_OFFSET), %rdx + ja L(more_8x_vec) + + /* Do comparisons for [65, 96] and [97, 128] 2x VEC at a time. + This can harm performance if non-zero return in [65, 80] or + [97, 112] but helps performance otherwise. Generally zero- + return is hotter. */ + movups (VEC_SIZE * 2)(%rsi), %xmm0 + movups (VEC_SIZE * 2)(%rdi), %xmm1 + PCMPEQ %xmm0, %xmm1 + movups (VEC_SIZE * 3)(%rsi), %xmm2 + movups (VEC_SIZE * 3)(%rdi), %xmm3 + PCMPEQ %xmm2, %xmm3 + pand %xmm1, %xmm3 + + pmovmskb %xmm3, %eax + CHECK_CMP (%ecx, %eax) + jnz L(ret_nonzero_vec_start_2_3) + + cmpl $(CHAR_PER_VEC * 6 - SIZE_OFFSET), %edx + jbe L(last_2x_vec) + + movups (VEC_SIZE * 4)(%rsi), %xmm0 + movups (VEC_SIZE * 4)(%rdi), %xmm1 + PCMPEQ %xmm0, %xmm1 + movups (VEC_SIZE * 5)(%rsi), %xmm2 + movups (VEC_SIZE * 5)(%rdi), %xmm3 + PCMPEQ %xmm2, %xmm3 + pand %xmm1, %xmm3 + + pmovmskb %xmm3, %eax + CHECK_CMP (%ecx, %eax) +# ifdef USE_AS_MEMCMPEQ + jz L(last_2x_vec) + ret +# else + jnz L(ret_nonzero_vec_start_4_5) +# endif + .p2align 4 +L(last_2x_vec): + movups (VEC_SIZE * -2 + SIZE_OFFSET)(%rsi, %rdx, CHAR_SIZE), %xmm0 + movups (VEC_SIZE * -2 + SIZE_OFFSET)(%rdi, %rdx, CHAR_SIZE), %xmm1 + PCMPEQ %xmm0, %xmm1 + movups (VEC_SIZE * -1 + SIZE_OFFSET)(%rsi, %rdx, CHAR_SIZE), %xmm2 + movups (VEC_SIZE * -1 + SIZE_OFFSET)(%rdi, %rdx, CHAR_SIZE), %xmm3 + PCMPEQ %xmm2, %xmm3 + pand %xmm1, %xmm3 + pmovmskb %xmm3, %eax + subl %ecx, %eax +# ifdef USE_AS_MEMCMPEQ + /* Various return targets for memcmpeq. Will always be hot in + Icache and get short encoding. */ +L(ret_nonzero_vec_start_2_3): +L(ret_nonzero_vec_start_4_5): + ret +# else + jnz L(ret_nonzero_vec_end_1) + ret + + .p2align 4,, 8 +L(ret_nonzero_vec_end_1): + pmovmskb %xmm1, %ecx + /* High 16 bits of eax guranteed to be all ones. Rotate them in + to we can do `or + not` with just `xor`. */ + rorl $16, %eax + xorl %ecx, %eax + /* Partial register stall. */ + + bsfl %eax, %eax +# ifdef USE_AS_WMEMCMP + leal (%rax, %rdx, CHAR_SIZE), %eax + movl (VEC_SIZE * -2 + SIZE_OFFSET)(%rdi, %rax), %ecx + xorl %edx, %edx + cmpl (VEC_SIZE * -2 + SIZE_OFFSET)(%rsi, %rax), %ecx + /* NB: no partial register stall here because xorl zero idiom + above. */ + setg %dl + leal -1(%rdx, %rdx), %eax +# else + addl %edx, %eax + movzbl (VEC_SIZE * -2 + SIZE_OFFSET)(%rsi, %rax), %ecx + movzbl (VEC_SIZE * -2 + SIZE_OFFSET)(%rdi, %rax), %eax + subl %ecx, %eax +# endif + ret + + .p2align 4 +L(ret_nonzero_vec_start_4_5): + pmovmskb %xmm1, %edx + sall $16, %eax + leal 1(%rax, %rdx), %eax + bsfl %eax, %eax +# ifdef USE_AS_WMEMCMP + movl (VEC_SIZE * 4)(%rdi, %rax), %ecx + xorl %edx, %edx + cmpl (VEC_SIZE * 4)(%rsi, %rax), %ecx + /* NB: no partial register stall here because xorl zero idiom + above. */ + setg %dl + leal -1(%rdx, %rdx), %eax +# else + movzbl (VEC_SIZE * 4)(%rsi, %rax), %ecx + movzbl (VEC_SIZE * 4)(%rdi, %rax), %eax + subl %ecx, %eax +# endif + ret + + .p2align 4,, 8 +L(ret_nonzero_vec_start_1): + bsfl %eax, %eax +# ifdef USE_AS_WMEMCMP + movl (VEC_SIZE * 1)(%rdi, %rax), %ecx + xorl %edx, %edx + cmpl (VEC_SIZE * 1)(%rsi, %rax), %ecx + /* NB: no partial register stall here because xorl zero idiom + above. */ + setg %dl + leal -1(%rdx, %rdx), %eax +# else + movzbl (VEC_SIZE * 1)(%rsi, %rax), %ecx + movzbl (VEC_SIZE * 1)(%rdi, %rax), %eax + subl %ecx, %eax +# endif + ret +# endif + + .p2align 4 +L(more_8x_vec): + subq %rdi, %rsi + leaq (VEC_SIZE * -6 + SIZE_OFFSET)(%rdi, %rdx, CHAR_SIZE), %rdx + andq $(VEC_SIZE * -1), %rdi + addq %rdi, %rsi + .p2align 4 +L(loop_4x): + movups (VEC_SIZE * 2)(%rsi), %xmm0 + movups (VEC_SIZE * 3)(%rsi), %xmm1 + + PCMPEQ (VEC_SIZE * 2)(%rdi), %xmm0 + PCMPEQ (VEC_SIZE * 3)(%rdi), %xmm1 + + movups (VEC_SIZE * 4)(%rsi), %xmm2 + movups (VEC_SIZE * 5)(%rsi), %xmm3 + + PCMPEQ (VEC_SIZE * 4)(%rdi), %xmm2 + PCMPEQ (VEC_SIZE * 5)(%rdi), %xmm3 + + pand %xmm0, %xmm1 + pand %xmm2, %xmm3 + pand %xmm1, %xmm3 + + pmovmskb %xmm3, %eax + subl %ecx, %eax + jnz L(ret_nonzero_loop) + + addq $(VEC_SIZE * 4), %rdi + addq $(VEC_SIZE * 4), %rsi + cmpq %rdi, %rdx + ja L(loop_4x) + /* Get remaining length in edx. */ + subl %edi, %edx + /* Restore offset so we can reuse L(last_2x_vec). */ + addl $(VEC_SIZE * 6 - SIZE_OFFSET), %edx +# ifdef USE_AS_WMEMCMP + shrl $2, %edx +# endif + cmpl $(CHAR_PER_VEC * 4 - SIZE_OFFSET), %edx + jbe L(last_2x_vec) + + + movups (VEC_SIZE * 2)(%rsi), %xmm0 + movups (VEC_SIZE * 2)(%rdi), %xmm1 + PCMPEQ %xmm0, %xmm1 + movups (VEC_SIZE * 3)(%rsi), %xmm2 + movups (VEC_SIZE * 3)(%rdi), %xmm3 + PCMPEQ %xmm2, %xmm3 + pand %xmm1, %xmm3 + + pmovmskb %xmm3, %eax + CHECK_CMP (%ecx, %eax) + jz L(last_2x_vec) +# ifdef USE_AS_MEMCMPEQ +L(ret_nonzero_loop): + ret +# else + + .p2align 4 +L(ret_nonzero_vec_start_2_3): + pmovmskb %xmm1, %edx + sall $16, %eax + leal 1(%rax, %rdx), %eax + + bsfl %eax, %eax +# ifdef USE_AS_WMEMCMP + movl (VEC_SIZE * 2)(%rdi, %rax), %ecx + xorl %edx, %edx + cmpl (VEC_SIZE * 2)(%rsi, %rax), %ecx + /* NB: no partial register stall here because xorl zero idiom + above. */ + setg %dl + leal -1(%rdx, %rdx), %eax +# else + movzbl (VEC_SIZE * 2)(%rsi, %rax), %ecx + movzbl (VEC_SIZE * 2)(%rdi, %rax), %eax + subl %ecx, %eax +# endif + ret + + .p2align 4 +L(ret_nonzero_loop): + pmovmskb %xmm0, %ecx + pmovmskb %xmm1, %edx + sall $(VEC_SIZE * 1), %edx + leal 1(%rcx, %rdx), %edx + pmovmskb %xmm2, %ecx + /* High 16 bits of eax guranteed to be all ones. Rotate them in + to we can do `or + not` with just `xor`. */ + rorl $16, %eax + xorl %ecx, %eax + + salq $32, %rax + orq %rdx, %rax + + bsfq %rax, %rax +# ifdef USE_AS_WMEMCMP + movl (VEC_SIZE * 2)(%rdi, %rax), %ecx + xorl %edx, %edx + cmpl (VEC_SIZE * 2)(%rsi, %rax), %ecx + /* NB: no partial register stall here because xorl zero idiom + above. */ + setg %dl + leal -1(%rdx, %rdx), %eax +# else + movzbl (VEC_SIZE * 2)(%rsi, %rax), %ecx + movzbl (VEC_SIZE * 2)(%rdi, %rax), %eax + subl %ecx, %eax +# endif + ret +# endif +END(MEMCMP) +#endif diff --git a/sysdeps/x86_64/multiarch/memcmpeq-avx2.S b/sysdeps/x86_64/multiarch/memcmpeq-avx2.S index 80020c4..664b109 100644 --- a/sysdeps/x86_64/multiarch/memcmpeq-avx2.S +++ b/sysdeps/x86_64/multiarch/memcmpeq-avx2.S @@ -16,7 +16,9 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#if IS_IN (libc) +#include <isa-level.h> + +#if ISA_SHOULD_BUILD (3) /* __memcmpeq is implemented as: 1. Use ymm vector compares when possible. The only case where diff --git a/sysdeps/x86_64/multiarch/memcmpeq-evex.S b/sysdeps/x86_64/multiarch/memcmpeq-evex.S index 7114547..41124ef 100644 --- a/sysdeps/x86_64/multiarch/memcmpeq-evex.S +++ b/sysdeps/x86_64/multiarch/memcmpeq-evex.S @@ -16,7 +16,9 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#if IS_IN (libc) +#include <isa-level.h> + +#if ISA_SHOULD_BUILD (4) /* __memcmpeq is implemented as: 1. Use ymm vector compares when possible. The only case where diff --git a/sysdeps/x86_64/multiarch/memcmpeq-sse2.S b/sysdeps/x86_64/multiarch/memcmpeq-sse2.S index 9d991e5..a412b0b 100644 --- a/sysdeps/x86_64/multiarch/memcmpeq-sse2.S +++ b/sysdeps/x86_64/multiarch/memcmpeq-sse2.S @@ -16,10 +16,10 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#if IS_IN (libc) -# define MEMCMP __memcmpeq_sse2 -#else -# define MEMCMP __memcmpeq +#ifndef MEMCMPEQ +# define MEMCMPEQ __memcmpeq_sse2 #endif + +#define MEMCMP MEMCMPEQ #define USE_AS_MEMCMPEQ 1 #include "memcmp-sse2.S" diff --git a/sysdeps/x86_64/multiarch/rtld-memcmp.S b/sysdeps/x86_64/multiarch/rtld-memcmp.S new file mode 100644 index 0000000..cf710f3 --- /dev/null +++ b/sysdeps/x86_64/multiarch/rtld-memcmp.S @@ -0,0 +1,18 @@ +/* Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include "../memcmp.S" diff --git a/sysdeps/x86_64/multiarch/rtld-memcmpeq.S b/sysdeps/x86_64/multiarch/rtld-memcmpeq.S new file mode 100644 index 0000000..13230088 --- /dev/null +++ b/sysdeps/x86_64/multiarch/rtld-memcmpeq.S @@ -0,0 +1,18 @@ +/* Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include "../memcmpeq.S" diff --git a/sysdeps/x86_64/multiarch/rtld-wmemcmp.S b/sysdeps/x86_64/multiarch/rtld-wmemcmp.S new file mode 100644 index 0000000..71a6f0a --- /dev/null +++ b/sysdeps/x86_64/multiarch/rtld-wmemcmp.S @@ -0,0 +1,18 @@ +/* Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include "../wmemcmp.S" diff --git a/sysdeps/x86_64/multiarch/wmemcmp-avx2-movbe.S b/sysdeps/x86_64/multiarch/wmemcmp-avx2-movbe.S index bfa1a16..9e723f2 100644 --- a/sysdeps/x86_64/multiarch/wmemcmp-avx2-movbe.S +++ b/sysdeps/x86_64/multiarch/wmemcmp-avx2-movbe.S @@ -1,4 +1,8 @@ -#define MEMCMP __wmemcmp_avx2_movbe +#ifndef WMEMCMP +# define WMEMCMP __wmemcmp_avx2_movbe +#endif + +#define MEMCMP WMEMCMP #define USE_AS_WMEMCMP 1 #include "memcmp-avx2-movbe.S" diff --git a/sysdeps/x86_64/multiarch/wmemcmp-evex-movbe.S b/sysdeps/x86_64/multiarch/wmemcmp-evex-movbe.S index 4726d74..40dbf0f 100644 --- a/sysdeps/x86_64/multiarch/wmemcmp-evex-movbe.S +++ b/sysdeps/x86_64/multiarch/wmemcmp-evex-movbe.S @@ -1,4 +1,8 @@ -#define MEMCMP __wmemcmp_evex_movbe +#ifndef WMEMCMP +# define WMEMCMP __wmemcmp_evex_movbe +#endif + +#define MEMCMP WMEMCMP #define USE_AS_WMEMCMP 1 #include "memcmp-evex-movbe.S" diff --git a/sysdeps/x86_64/multiarch/wmemcmp-sse2.S b/sysdeps/x86_64/multiarch/wmemcmp-sse2.S index f09192e..47f6006 100644 --- a/sysdeps/x86_64/multiarch/wmemcmp-sse2.S +++ b/sysdeps/x86_64/multiarch/wmemcmp-sse2.S @@ -16,6 +16,11 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ +#ifndef WMEMCMP +# define WMEMCMP __wmemcmp_sse2 +#endif + +#define MEMCMP WMEMCMP #define USE_AS_WMEMCMP 1 -#define MEMCMP __wmemcmp_sse2 -#include "../memcmp.S" + +#include "memcmp-sse2.S" diff --git a/sysdeps/x86_64/wmemcmp.S b/sysdeps/x86_64/wmemcmp.S index 815b999..cf90a64 100644 --- a/sysdeps/x86_64/wmemcmp.S +++ b/sysdeps/x86_64/wmemcmp.S @@ -1,4 +1,4 @@ -/* wmemcmp optimized with SSE2. +/* wmemcmp hook for non-multiarch and RTLD build. Copyright (C) 2022 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -16,8 +16,12 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#define MEMCMP __wmemcmp -#define USE_AS_WMEMCMP 1 -#include "memcmp.S" +#define WMEMCMP __wmemcmp + +#define DEFAULT_IMPL_V1 "multiarch/wmemcmp-sse2.S" +#define DEFAULT_IMPL_V3 "multiarch/wmemcmp-avx2-movbe.S" +#define DEFAULT_IMPL_V4 "multiarch/wmemcmp-evex-movbe.S" + +#include "isa-default-impl.h" weak_alias (__wmemcmp, wmemcmp) |