libc/arm: optimize crc32/crc32c for arm
Optimize crc32 standard(poly:0x04C11DB7) and crc32 castagnoli(poly:0x1EDC6F41) with arm crc32 extension instructions. For example, crc32 standard caculates(lookup crc32 table) 1812 bytes data, reduced the time from 118 us to 14 us through optimization. Performance improved ~700% Signed-off-by: Jinliang Li <lijinliang1@lixiang.com>
This commit is contained in:
Jinliang Li
Alan C. Assis
parent
586d216a40
commit
d5db7d1cee
6 changed files with 223 additions and 68 deletions
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@ -434,6 +434,12 @@ config ARCH_HAVE_FORK
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bool
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default n
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config ARCH_HAVE_CRC32
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bool
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default n
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---help---
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Architecture supports CRC32 instruction
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config ARCH_HAVE_FPU
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bool
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default n
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@ -68,4 +68,8 @@ if(CONFIG_PROFILE_MINI)
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list(APPEND SRCS gnu/mcount.S)
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endif()
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if(CONFIG_LIBC_ARCH_CRC32)
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list(APPEND SRCS arch_crc32.c)
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endif()
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target_sources(c PRIVATE ${SRCS})
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@ -31,3 +31,10 @@ endif
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if ARCH_ARMV8R
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source "libs/libc/machine/arm/armv8-r/Kconfig"
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endif
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config LIBC_ARCH_CRC32
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bool "Enable optimized crc32 for ARM"
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default n
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depends on ARCH_HAVE_CRC32
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---help---
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Enable optimized arm neon specific crc32 library function
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@ -66,6 +66,10 @@ ifeq ($(CONFIG_PROFILE_MINI),y)
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ASRCS += mcount.S
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endif
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ifeq ($(CONFIG_LIBC_ARCH_CRC32),y)
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CSRCS += arch_crc32.c
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endif
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ifeq ($(CONFIG_ARCH_TOOLCHAIN_GNU),y)
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DEPPATH += --dep-path machine/arm/gnu
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VPATH += :machine/arm/gnu
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115
libs/libc/machine/arm/arch_crc32.c
Normal file
115
libs/libc/machine/arm/arch_crc32.c
Normal file
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@ -0,0 +1,115 @@
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/****************************************************************************
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* libs/libc/machine/arm/arch_crc32.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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#include <sys/types.h>
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#include <arm_acle.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: crc32part
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*
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* Description:
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* crc32 polynomial 0x04C11DB7 (bitreflected 0xEDB88320)
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*
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****************************************************************************/
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uint32_t crc32part(FAR const uint8_t *src, size_t len, uint32_t crc32val)
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{
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size_t i = 0;
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for (; (i + 8) <= len; i += 8)
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{
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uint64_t data = *(uint64_t *)(src + i);
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crc32val = __crc32d(crc32val, data);
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}
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if (i + 4 <= len)
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{
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uint32_t data = *(uint32_t *)(src + i);
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crc32val = __crc32w(crc32val, data);
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i += 4;
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}
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if (i + 2 <= len)
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{
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uint16_t data = *(uint16_t *)(src + i);
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crc32val = __crc32h(crc32val, data);
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i += 2;
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}
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if (i < len)
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{
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uint8_t data = *(uint8_t *)(src + i);
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crc32val = __crc32b(crc32val, data);
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}
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return crc32val;
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}
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/****************************************************************************
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* Name: crc32part_c
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*
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* Description:
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* crc32 Castagnoli polynomial 0x1EDC6F41
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*
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****************************************************************************/
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uint32_t crc32part_c(FAR const uint8_t *src, size_t len, uint32_t crc32val)
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{
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size_t i = 0;
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for (; (i + 8) <= len; i += 8)
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{
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uint64_t data = *(uint64_t *)(src + i);
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crc32val = __crc32cd(crc32val, data);
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}
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if (i + 4 <= len)
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{
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uint32_t data = *(uint32_t *)(src + i);
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crc32val = __crc32cw(crc32val, data);
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i += 4;
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}
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if (i + 2 <= len)
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{
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uint16_t data = *(uint16_t *)(src + i);
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crc32val = __crc32ch(crc32val, data);
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i += 2;
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}
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if (i < len)
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{
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uint8_t data = *(uint8_t *)(src + i);
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crc32val = __crc32cb(crc32val, data);
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}
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return crc32val;
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}
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@ -1,4 +1,4 @@
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/************************************************************************************************
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/****************************************************************************
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* libs/libc/misc/lib_crc32.c
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*
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* SPDX-License-Identifier: Apache-2.0
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@ -18,110 +18,127 @@
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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***********************************************************************************************/
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****************************************************************************/
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/* The logic in this file was developed by Gary S. Brown:
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*
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* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or code or tables
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* extracted from it, as desired without restriction.
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* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or code or
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* tables extracted from it, as desired without restriction.
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*
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* First, the polynomial itself and its table of feedback terms. The polynomial is:
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* First, the polynomial itself and its table of feedback terms. The
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* polynomial is:
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*
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* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
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*
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* Note that we take it "backwards" and put the highest-order term in the lowest-order bit.
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* The X^32 term is "implied"; the LSB is the X^31 term, etc. The X^0 term (usually shown
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* as "+1") results in the MSB being 1
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* Note that we take it "backwards" and put the highest-order term in the
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* lowest-order bit. The X^32 term is "implied"; the LSB is the X^31 term,
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* etc. The X^0 term (usually shown as "+1") results in the MSB being 1
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*
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* Note that the usual hardware shift register implementation, which is what we're using
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* (we're merely optimizing it by doing eight-bit chunks at a time) shifts bits into the
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* lowest-order term. In our implementation, that means shifting towards the right. Why
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* do we do it this way? Because the calculated CRC must be transmitted in order from
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* highest-order term to lowest-order term. UARTs transmit characters in order from LSB
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* to MSB. By storing the CRC this way we hand it to the UART in the order low-byte to
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* high-byte; the UART sends each low-bit to hight-bit; and the result is transmission bit
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* by bit from highest- to lowest-order term without requiring any bit shuffling on our
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* part. Reception works similarly
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* Note that the usual hardware shift register implementation, which is what
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* we're using (we're merely optimizing it by doing eight-bit chunks at a
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* time) shifts bits into the lowest-order term. In our implementation, that
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* means shifting towards the right. Why do we do it this way? Because the
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* calculated CRC must be transmitted in order from
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* highest-order term to lowest-order term. UARTs transmit characters in
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* order from LSB to MSB. By storing the CRC this way we hand it to the UART
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* in the order low-byte to high-byte; the UART sends each low-bit to
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* hight-bit; and the result is transmission bit by bit from highest- to
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* lowest-order term without requiring any bit shuffling on our part.
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* Reception works similarly
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*
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* The feedback terms table consists of 256, 32-bit entries. Notes
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*
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* - The table can be generated at runtime if desired; code to do so is shown later. It
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* might not be obvious, but the feedback terms simply represent the results of eight
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* shift/xor operations for all combinations of data and CRC register values
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* - The table can be generated at runtime if desired; code to do so is shown
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* later. It might not be obvious, but the feedback terms simply represent
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* the results of eight shift/xor operations for all combinations of data
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* and CRC register values
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*
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* - The values must be right-shifted by eight bits by the updcrc logic; the shift must
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* be u_(bring in zeroes). On some hardware you could probably optimize the shift in
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* assembler by using byte-swap instructions polynomial $edb88320
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************************************************************************************************/
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* - The values must be right-shifted by eight bits by the updcrc logic; the
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* shift must be u_(bring in zeroes). On some hardware you could probably
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* optimize the shift in assembler by using byte-swap instructions
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* polynomial $edb88320
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****************************************************************************/
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/************************************************************************************************
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/****************************************************************************
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* Included Files
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************************************************************************************************/
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****************************************************************************/
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#include <sys/types.h>
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#include <stdint.h>
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#include <nuttx/crc32.h>
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/************************************************************************************************
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/****************************************************************************
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* Private Data
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************************************************************************************************/
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****************************************************************************/
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#ifndef CONFIG_LIBC_ARCH_CRC32
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#ifdef CONFIG_LIBC_CRC32_SLOW
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# define LIBC_CRC32_POLY 0xedb88320
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# define LIBC_CRC32_POLY 0xedb88320
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#else
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static const uint32_t crc32_tab[] =
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{
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
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0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
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0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
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0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
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0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
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0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
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0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
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0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
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0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
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0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
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0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
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0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
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0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
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0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
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0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
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0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
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0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
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0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
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0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
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0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
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0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
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0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
|
||||
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
|
||||
0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
|
||||
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
|
||||
0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
|
||||
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
|
||||
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
|
||||
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
|
||||
0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
|
||||
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
|
||||
0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
|
||||
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
|
||||
0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
|
||||
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
|
||||
0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
|
||||
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
|
||||
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
|
||||
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
|
||||
0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
|
||||
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
|
||||
0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
|
||||
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
|
||||
0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
|
||||
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
|
||||
};
|
||||
#endif
|
||||
|
||||
/************************************************************************************************
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
************************************************************************************************/
|
||||
****************************************************************************/
|
||||
|
||||
/************************************************************************************************
|
||||
/****************************************************************************
|
||||
* Name: crc32part
|
||||
*
|
||||
* Description:
|
||||
* Continue CRC calculation on a part of the buffer.
|
||||
*
|
||||
************************************************************************************************/
|
||||
****************************************************************************/
|
||||
|
||||
uint32_t crc32part(FAR const uint8_t *src, size_t len, uint32_t crc32val)
|
||||
{
|
||||
size_t i;
|
||||
|
||||
#ifdef CONFIG_LIBC_CRC32_SLOW
|
||||
for (i = 0; i < len; i++)
|
||||
{
|
||||
|
|
@ -149,13 +166,15 @@ uint32_t crc32part(FAR const uint8_t *src, size_t len, uint32_t crc32val)
|
|||
return crc32val;
|
||||
}
|
||||
|
||||
/************************************************************************************************
|
||||
#endif /* CONFIG_LIBC_ARCH_CRC32 */
|
||||
|
||||
/****************************************************************************
|
||||
* Name: crc32
|
||||
*
|
||||
* Description:
|
||||
* Return a 32-bit CRC of the contents of the 'src' buffer, length 'len'
|
||||
*
|
||||
************************************************************************************************/
|
||||
****************************************************************************/
|
||||
|
||||
uint32_t crc32(FAR const uint8_t *src, size_t len)
|
||||
{
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue