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https://sourceware.org/git/glibc.git
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x86-64: Add memcmp family functions with 256-bit EVEX
Update ifunc-memcmp.h to select the function optimized with 256-bit EVEX instructions using YMM16-YMM31 registers to avoid RTM abort with usable AVX512VL, AVX512BW and MOVBE since VZEROUPPER isn't needed at function exit.
This commit is contained in:
H.J. Lu
parent
1b968b6b9b
commit
91264fe357
@ -41,6 +41,7 @@ sysdep_routines += strncat-c stpncpy-c strncpy-c \
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memset-avx2-unaligned-erms \
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memset-avx512-unaligned-erms \
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memchr-evex \
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memcmp-evex-movbe \
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memmove-evex-unaligned-erms \
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memrchr-evex \
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memset-evex-unaligned-erms \
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@ -81,7 +82,8 @@ sysdep_routines += wmemcmp-sse4 wmemcmp-ssse3 wmemcmp-c \
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wcsncmp-evex \
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wcsnlen-evex \
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wcsrchr-evex \
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wmemchr-evex
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wmemchr-evex \
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wmemcmp-evex-movbe
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endif
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ifeq ($(subdir),debug)
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@ -56,6 +56,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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(CPU_FEATURE_USABLE (AVX2)
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&& CPU_FEATURE_USABLE (MOVBE)),
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__memcmp_avx2_movbe)
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IFUNC_IMPL_ADD (array, i, memcmp,
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(CPU_FEATURE_USABLE (AVX512VL)
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&& CPU_FEATURE_USABLE (AVX512BW)
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&& CPU_FEATURE_USABLE (MOVBE)),
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__memcmp_evex_movbe)
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IFUNC_IMPL_ADD (array, i, memcmp, CPU_FEATURE_USABLE (SSE4_1),
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__memcmp_sse4_1)
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IFUNC_IMPL_ADD (array, i, memcmp, CPU_FEATURE_USABLE (SSSE3),
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@ -558,6 +563,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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(CPU_FEATURE_USABLE (AVX2)
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&& CPU_FEATURE_USABLE (MOVBE)),
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__wmemcmp_avx2_movbe)
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IFUNC_IMPL_ADD (array, i, wmemcmp,
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(CPU_FEATURE_USABLE (AVX512VL)
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&& CPU_FEATURE_USABLE (AVX512BW)
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&& CPU_FEATURE_USABLE (MOVBE)),
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__wmemcmp_evex_movbe)
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IFUNC_IMPL_ADD (array, i, wmemcmp, CPU_FEATURE_USABLE (SSE4_1),
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__wmemcmp_sse4_1)
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IFUNC_IMPL_ADD (array, i, wmemcmp, CPU_FEATURE_USABLE (SSSE3),
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@ -23,17 +23,24 @@ extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (sse4_1) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_movbe) attribute_hidden;
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extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_movbe) attribute_hidden;
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static inline void *
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IFUNC_SELECTOR (void)
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{
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const struct cpu_features* cpu_features = __get_cpu_features ();
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if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX2)
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if (CPU_FEATURE_USABLE_P (cpu_features, AVX2)
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&& CPU_FEATURE_USABLE_P (cpu_features, MOVBE)
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&& CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
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return OPTIMIZE (avx2_movbe);
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{
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if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
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&& CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
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return OPTIMIZE (evex_movbe);
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if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
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return OPTIMIZE (avx2_movbe);
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}
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if (CPU_FEATURE_USABLE_P (cpu_features, SSE4_1))
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return OPTIMIZE (sse4_1);
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440
sysdeps/x86_64/multiarch/memcmp-evex-movbe.S
Normal file
440
sysdeps/x86_64/multiarch/memcmp-evex-movbe.S
Normal file
@ -0,0 +1,440 @@
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/* memcmp/wmemcmp optimized with 256-bit EVEX instructions.
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Copyright (C) 2021 Free Software Foundation, Inc.
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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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<https://www.gnu.org/licenses/>. */
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#if IS_IN (libc)
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/* memcmp/wmemcmp is implemented as:
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1. For size from 2 to 7 bytes, load as big endian with movbe and bswap
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to avoid branches.
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2. Use overlapping compare to avoid branch.
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3. Use vector compare when size >= 4 bytes for memcmp or size >= 8
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bytes for wmemcmp.
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4. If size is 8 * VEC_SIZE or less, unroll the loop.
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5. Compare 4 * VEC_SIZE at a time with the aligned first memory
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area.
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6. Use 2 vector compares when size is 2 * VEC_SIZE or less.
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7. Use 4 vector compares when size is 4 * VEC_SIZE or less.
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8. Use 8 vector compares when size is 8 * VEC_SIZE or less. */
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# include <sysdep.h>
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# ifndef MEMCMP
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# define MEMCMP __memcmp_evex_movbe
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# endif
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# define VMOVU vmovdqu64
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# ifdef USE_AS_WMEMCMP
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# define VPCMPEQ vpcmpeqd
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# else
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# define VPCMPEQ vpcmpeqb
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# endif
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# define XMM1 xmm17
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# define XMM2 xmm18
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# define YMM1 ymm17
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# define YMM2 ymm18
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# define YMM3 ymm19
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# define YMM4 ymm20
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# define YMM5 ymm21
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# define YMM6 ymm22
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# define VEC_SIZE 32
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# ifdef USE_AS_WMEMCMP
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# define VEC_MASK 0xff
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# define XMM_MASK 0xf
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# else
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# define VEC_MASK 0xffffffff
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# define XMM_MASK 0xffff
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# endif
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/* Warning!
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wmemcmp has to use SIGNED comparison for elements.
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memcmp has to use UNSIGNED comparison for elemnts.
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*/
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.section .text.evex,"ax",@progbits
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ENTRY (MEMCMP)
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# ifdef USE_AS_WMEMCMP
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shl $2, %RDX_LP
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# elif defined __ILP32__
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/* Clear the upper 32 bits. */
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movl %edx, %edx
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# endif
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cmp $VEC_SIZE, %RDX_LP
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jb L(less_vec)
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/* From VEC to 2 * VEC. No branch when size == VEC_SIZE. */
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VMOVU (%rsi), %YMM2
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VPCMPEQ (%rdi), %YMM2, %k1
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kmovd %k1, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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cmpq $(VEC_SIZE * 2), %rdx
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jbe L(last_vec)
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/* More than 2 * VEC. */
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cmpq $(VEC_SIZE * 8), %rdx
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ja L(more_8x_vec)
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cmpq $(VEC_SIZE * 4), %rdx
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jb L(last_4x_vec)
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/* From 4 * VEC to 8 * VEC, inclusively. */
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VMOVU (%rsi), %YMM1
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VPCMPEQ (%rdi), %YMM1, %k1
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VMOVU VEC_SIZE(%rsi), %YMM2
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VPCMPEQ VEC_SIZE(%rdi), %YMM2, %k2
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VMOVU (VEC_SIZE * 2)(%rsi), %YMM3
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VPCMPEQ (VEC_SIZE * 2)(%rdi), %YMM3, %k3
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VMOVU (VEC_SIZE * 3)(%rsi), %YMM4
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VPCMPEQ (VEC_SIZE * 3)(%rdi), %YMM4, %k4
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kandd %k1, %k2, %k5
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kandd %k3, %k4, %k6
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kandd %k5, %k6, %k6
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kmovd %k6, %eax
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cmpl $VEC_MASK, %eax
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jne L(4x_vec_end)
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leaq -(4 * VEC_SIZE)(%rdi, %rdx), %rdi
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leaq -(4 * VEC_SIZE)(%rsi, %rdx), %rsi
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VMOVU (%rsi), %YMM1
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VPCMPEQ (%rdi), %YMM1, %k1
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VMOVU VEC_SIZE(%rsi), %YMM2
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VPCMPEQ VEC_SIZE(%rdi), %YMM2, %k2
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kandd %k1, %k2, %k5
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VMOVU (VEC_SIZE * 2)(%rsi), %YMM3
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VPCMPEQ (VEC_SIZE * 2)(%rdi), %YMM3, %k3
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kandd %k3, %k5, %k5
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VMOVU (VEC_SIZE * 3)(%rsi), %YMM4
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VPCMPEQ (VEC_SIZE * 3)(%rdi), %YMM4, %k4
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kandd %k4, %k5, %k5
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kmovd %k5, %eax
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cmpl $VEC_MASK, %eax
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jne L(4x_vec_end)
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xorl %eax, %eax
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ret
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.p2align 4
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L(last_2x_vec):
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/* From VEC to 2 * VEC. No branch when size == VEC_SIZE. */
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VMOVU (%rsi), %YMM2
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VPCMPEQ (%rdi), %YMM2, %k2
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kmovd %k2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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L(last_vec):
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/* Use overlapping loads to avoid branches. */
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leaq -VEC_SIZE(%rdi, %rdx), %rdi
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leaq -VEC_SIZE(%rsi, %rdx), %rsi
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VMOVU (%rsi), %YMM2
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VPCMPEQ (%rdi), %YMM2, %k2
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kmovd %k2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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ret
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.p2align 4
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L(first_vec):
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/* A byte or int32 is different within 16 or 32 bytes. */
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tzcntl %eax, %ecx
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# ifdef USE_AS_WMEMCMP
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xorl %eax, %eax
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movl (%rdi, %rcx, 4), %edx
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cmpl (%rsi, %rcx, 4), %edx
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L(wmemcmp_return):
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setl %al
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negl %eax
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orl $1, %eax
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# else
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movzbl (%rdi, %rcx), %eax
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movzbl (%rsi, %rcx), %edx
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sub %edx, %eax
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# endif
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ret
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# ifdef USE_AS_WMEMCMP
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.p2align 4
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L(4):
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xorl %eax, %eax
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movl (%rdi), %edx
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cmpl (%rsi), %edx
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jne L(wmemcmp_return)
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ret
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# else
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.p2align 4
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L(between_4_7):
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/* Load as big endian with overlapping movbe to avoid branches. */
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movbe (%rdi), %eax
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movbe (%rsi), %ecx
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shlq $32, %rax
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shlq $32, %rcx
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movbe -4(%rdi, %rdx), %edi
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movbe -4(%rsi, %rdx), %esi
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orq %rdi, %rax
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orq %rsi, %rcx
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subq %rcx, %rax
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je L(exit)
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sbbl %eax, %eax
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orl $1, %eax
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ret
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.p2align 4
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L(exit):
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ret
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.p2align 4
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L(between_2_3):
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/* Load as big endian to avoid branches. */
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movzwl (%rdi), %eax
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movzwl (%rsi), %ecx
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shll $8, %eax
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shll $8, %ecx
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bswap %eax
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bswap %ecx
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movb -1(%rdi, %rdx), %al
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movb -1(%rsi, %rdx), %cl
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/* Subtraction is okay because the upper 8 bits are zero. */
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subl %ecx, %eax
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ret
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.p2align 4
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L(1):
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movzbl (%rdi), %eax
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movzbl (%rsi), %ecx
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subl %ecx, %eax
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ret
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# endif
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.p2align 4
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L(zero):
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xorl %eax, %eax
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ret
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.p2align 4
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L(less_vec):
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# ifdef USE_AS_WMEMCMP
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/* It can only be 0, 4, 8, 12, 16, 20, 24, 28 bytes. */
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cmpb $4, %dl
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je L(4)
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jb L(zero)
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# else
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cmpb $1, %dl
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je L(1)
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jb L(zero)
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cmpb $4, %dl
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jb L(between_2_3)
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cmpb $8, %dl
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jb L(between_4_7)
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# endif
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cmpb $16, %dl
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jae L(between_16_31)
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/* It is between 8 and 15 bytes. */
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vmovq (%rdi), %XMM1
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vmovq (%rsi), %XMM2
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VPCMPEQ %XMM1, %XMM2, %k2
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kmovw %k2, %eax
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subl $XMM_MASK, %eax
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jnz L(first_vec)
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/* Use overlapping loads to avoid branches. */
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leaq -8(%rdi, %rdx), %rdi
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leaq -8(%rsi, %rdx), %rsi
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vmovq (%rdi), %XMM1
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vmovq (%rsi), %XMM2
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VPCMPEQ %XMM1, %XMM2, %k2
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kmovw %k2, %eax
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subl $XMM_MASK, %eax
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jnz L(first_vec)
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ret
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.p2align 4
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L(between_16_31):
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/* From 16 to 31 bytes. No branch when size == 16. */
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VMOVU (%rsi), %XMM2
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VPCMPEQ (%rdi), %XMM2, %k2
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kmovw %k2, %eax
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subl $XMM_MASK, %eax
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jnz L(first_vec)
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/* Use overlapping loads to avoid branches. */
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leaq -16(%rdi, %rdx), %rdi
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leaq -16(%rsi, %rdx), %rsi
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VMOVU (%rsi), %XMM2
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VPCMPEQ (%rdi), %XMM2, %k2
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kmovw %k2, %eax
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subl $XMM_MASK, %eax
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jnz L(first_vec)
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ret
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.p2align 4
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L(more_8x_vec):
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/* More than 8 * VEC. Check the first VEC. */
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VMOVU (%rsi), %YMM2
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VPCMPEQ (%rdi), %YMM2, %k2
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kmovd %k2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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/* Align the first memory area for aligned loads in the loop.
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Compute how much the first memory area is misaligned. */
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movq %rdi, %rcx
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andl $(VEC_SIZE - 1), %ecx
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/* Get the negative of offset for alignment. */
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subq $VEC_SIZE, %rcx
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/* Adjust the second memory area. */
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subq %rcx, %rsi
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/* Adjust the first memory area which should be aligned now. */
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subq %rcx, %rdi
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/* Adjust length. */
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addq %rcx, %rdx
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L(loop_4x_vec):
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/* Compare 4 * VEC at a time forward. */
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VMOVU (%rsi), %YMM1
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VPCMPEQ (%rdi), %YMM1, %k1
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VMOVU VEC_SIZE(%rsi), %YMM2
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VPCMPEQ VEC_SIZE(%rdi), %YMM2, %k2
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kandd %k2, %k1, %k5
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VMOVU (VEC_SIZE * 2)(%rsi), %YMM3
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VPCMPEQ (VEC_SIZE * 2)(%rdi), %YMM3, %k3
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kandd %k3, %k5, %k5
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VMOVU (VEC_SIZE * 3)(%rsi), %YMM4
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VPCMPEQ (VEC_SIZE * 3)(%rdi), %YMM4, %k4
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kandd %k4, %k5, %k5
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kmovd %k5, %eax
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cmpl $VEC_MASK, %eax
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jne L(4x_vec_end)
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addq $(VEC_SIZE * 4), %rdi
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addq $(VEC_SIZE * 4), %rsi
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subq $(VEC_SIZE * 4), %rdx
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cmpq $(VEC_SIZE * 4), %rdx
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jae L(loop_4x_vec)
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/* Less than 4 * VEC. */
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cmpq $VEC_SIZE, %rdx
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jbe L(last_vec)
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cmpq $(VEC_SIZE * 2), %rdx
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jbe L(last_2x_vec)
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L(last_4x_vec):
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/* From 2 * VEC to 4 * VEC. */
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VMOVU (%rsi), %YMM2
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VPCMPEQ (%rdi), %YMM2, %k2
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kmovd %k2, %eax
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subl $VEC_MASK, %eax
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jnz L(first_vec)
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addq $VEC_SIZE, %rdi
|
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addq $VEC_SIZE, %rsi
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k2
|
||||
kmovd %k2, %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
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k2
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
|
||||
addq $VEC_SIZE, %rdi
|
||||
addq $VEC_SIZE, %rsi
|
||||
VMOVU (%rsi), %YMM2
|
||||
VPCMPEQ (%rdi), %YMM2, %k2
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(4x_vec_end):
|
||||
kmovd %k1, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec)
|
||||
kmovd %k2, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec_x1)
|
||||
kmovd %k3, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
jnz L(first_vec_x2)
|
||||
kmovd %k4, %eax
|
||||
subl $VEC_MASK, %eax
|
||||
tzcntl %eax, %ecx
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
xorl %eax, %eax
|
||||
movl (VEC_SIZE * 3)(%rdi, %rcx, 4), %edx
|
||||
cmpl (VEC_SIZE * 3)(%rsi, %rcx, 4), %edx
|
||||
jmp L(wmemcmp_return)
|
||||
# else
|
||||
movzbl (VEC_SIZE * 3)(%rdi, %rcx), %eax
|
||||
movzbl (VEC_SIZE * 3)(%rsi, %rcx), %edx
|
||||
sub %edx, %eax
|
||||
# endif
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x1):
|
||||
tzcntl %eax, %ecx
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
xorl %eax, %eax
|
||||
movl VEC_SIZE(%rdi, %rcx, 4), %edx
|
||||
cmpl VEC_SIZE(%rsi, %rcx, 4), %edx
|
||||
jmp L(wmemcmp_return)
|
||||
# else
|
||||
movzbl VEC_SIZE(%rdi, %rcx), %eax
|
||||
movzbl VEC_SIZE(%rsi, %rcx), %edx
|
||||
sub %edx, %eax
|
||||
# endif
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x2):
|
||||
tzcntl %eax, %ecx
|
||||
# ifdef USE_AS_WMEMCMP
|
||||
xorl %eax, %eax
|
||||
movl (VEC_SIZE * 2)(%rdi, %rcx, 4), %edx
|
||||
cmpl (VEC_SIZE * 2)(%rsi, %rcx, 4), %edx
|
||||
jmp L(wmemcmp_return)
|
||||
# else
|
||||
movzbl (VEC_SIZE * 2)(%rdi, %rcx), %eax
|
||||
movzbl (VEC_SIZE * 2)(%rsi, %rcx), %edx
|
||||
sub %edx, %eax
|
||||
# endif
|
||||
ret
|
||||
END (MEMCMP)
|
||||
#endif
|
||||
4
sysdeps/x86_64/multiarch/wmemcmp-evex-movbe.S
Normal file
4
sysdeps/x86_64/multiarch/wmemcmp-evex-movbe.S
Normal file
@ -0,0 +1,4 @@
|
||||
#define MEMCMP __wmemcmp_evex_movbe
|
||||
#define USE_AS_WMEMCMP 1
|
||||
|
||||
#include "memcmp-evex-movbe.S"
|
||||
Loading…
Reference in New Issue
Block a user