feat:C库典型高频函数优化
针对字符串类高频函数： 1. 采用单次多字节操作提升字符串类高频函数的执行效率 2. 针对armv7-a，采用neon指令进行优化 close: #I42DAK Signed-off-by: arvinzzz <zhaotianyu9@huawei.com> Change-Id: Ic90d92f778e0006881f793585264ad7e5f644104
This commit is contained in:
arvinzzz
parent
d2fe0e788b
commit
689c2e90cf
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@ -60,6 +60,13 @@ kernel_module(module_name) {
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"$OPTRTDIR/string/arm/strcmp.S",
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"$OPTRTDIR/string/arm/strcmp.S",
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"$OPTRTDIR/string/arm/strcpy.c",
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"$OPTRTDIR/string/arm/strcpy.c",
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"$OPTRTDIR/string/arm/strlen-armv6t2.S",
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"$OPTRTDIR/string/arm/strlen-armv6t2.S",
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"src/arch/arm/memset.S",
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"src/arch/arm/memcmp.S",
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]
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} else {
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sources += [
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"src/memset.c",
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"src/memcmp.c",
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]
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]
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}
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}
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@ -9,6 +9,9 @@ MUSLPORTINGDIR = $(MUSLDIR)/porting/liteos_a/kernel
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OPTRTDIR = $(TOPDIR)/third_party/optimized-routines
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OPTRTDIR = $(TOPDIR)/third_party/optimized-routines
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MUSL_SRCS =
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MUSL_SRCS =
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LOCAL_OPT_DIR = src/arch/$(ARCH)
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LOCAL_OPT_SRCS =
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LOCAL_FILTER_SRCS =
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MUSLPORTING_SRCS = \
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MUSLPORTING_SRCS = \
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src/*/$(ARCH)/*.[csS] \
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src/*/$(ARCH)/*.[csS] \
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@ -16,6 +19,13 @@ MUSLPORTING_SRCS = \
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LOCAL_SRCS = $(wildcard $(addprefix $(MUSLPORTINGDIR)/,$(MUSLPORTING_SRCS)))
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LOCAL_SRCS = $(wildcard $(addprefix $(MUSLPORTINGDIR)/,$(MUSLPORTING_SRCS)))
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LOCAL_SRCS := $(filter-out $(subst $(MUSLPORTINGDIR),$(MUSLDIR),$(LOCAL_SRCS)),$(addprefix $(MUSLDIR)/,$(MUSL_SRCS)) $(LOCAL_SRCS))
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LOCAL_SRCS := $(filter-out $(subst $(MUSLPORTINGDIR),$(MUSLDIR),$(LOCAL_SRCS)),$(addprefix $(MUSLDIR)/,$(MUSL_SRCS)) $(LOCAL_SRCS))
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LOCAL_SRCS += $(wildcard src/*.c src/*.S)
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# Sources optimized for specific architectures
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LOCAL_OPT_SRCS := $(wildcard $(LOCAL_OPT_DIR)/*.c, $(LOCAL_OPT_DIR)/*.S)
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# Enumerate common src files with the same name as the optimized srcs
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LOCAL_FILTER_SRCS := $(addprefix $(MUSLPORTINGDIR)/src/string/,$(subst $(LOCAL_OPT_DIR)/,,$(LOCAL_OPT_SRCS)))
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LOCAL_FILTER_SRCS += $(addprefix src/,$(subst $(LOCAL_OPT_DIR)/,,$(LOCAL_OPT_SRCS)))
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LOCAL_FILTER_SRCS := $(subst .S,.c, $(LOCAL_FILTER_SRCS))
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ifeq ($(LOSCFG_ARCH_ARM_VER), "armv7-a")
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ifeq ($(LOSCFG_ARCH_ARM_VER), "armv7-a")
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LOCAL_SRCS := $(filter-out $(addprefix $(MUSLPORTINGDIR)/src/string/,memchr.c memcpy.c strcmp.c strcpy.c strlen.c), $(LOCAL_SRCS))
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LOCAL_SRCS := $(filter-out $(addprefix $(MUSLPORTINGDIR)/src/string/,memchr.c memcpy.c strcmp.c strcpy.c strlen.c), $(LOCAL_SRCS))
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@ -25,10 +35,11 @@ LOCAL_SRCS += \
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$(OPTRTDIR)/string/arm/strcmp.S \
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$(OPTRTDIR)/string/arm/strcmp.S \
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$(OPTRTDIR)/string/arm/strcpy.c \
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$(OPTRTDIR)/string/arm/strcpy.c \
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$(OPTRTDIR)/string/arm/strlen-armv6t2.S
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$(OPTRTDIR)/string/arm/strlen-armv6t2.S
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# Replace the general srcs of the same name with specially optimized srcs
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LOCAL_SRCS += $(LOCAL_OPT_SRCS)
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LOCAL_SRCS := $(filter-out $(LOCAL_FILTER_SRCS),$(LOCAL_SRCS))
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endif
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endif
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LOCAL_SRCS += $(wildcard src/*.c src/*/*.c)
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LOCAL_INCLUDE := \
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LOCAL_INCLUDE := \
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-I $(LITEOSTOPDIR)/syscall \
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-I $(LITEOSTOPDIR)/syscall \
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-I $(LITEOSTOPDIR)/bsd/dev/random \
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-I $(LITEOSTOPDIR)/bsd/dev/random \
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@ -0,0 +1,207 @@
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/*
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* Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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.syntax unified
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.arch armv7-a
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.fpu neon
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.globl memcmp @ -- Begin function memcmp
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.p2align 2
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.type memcmp,%function
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.code 32 @memcmp
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memcmp:
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@ r0 = str1
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@ r1 = str2
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@ r2 = count
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.fnstart
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push {r4, r5, r6, r7, lr}
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pld [r0, #0]
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pld [r1, #0]
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/**
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* if (str1 == str2) || (n == 0) return;
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*/
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cmp r0, r1
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cmpne r2, #0
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beq Lreturn_0
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/**
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* Determine whether the first byte is different.
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*/
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ldrb r3, [r0] @ r3 = *str1
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ldrb r4, [r1] @ r4 = *str2
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pld [r0, #64]
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pld [r1, #64]
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cmp r3, r4
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subne r0, r3, r4
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bne Lreturn
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/**
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* Comparing 32 bytes each time, using floating-point registers to improve efficiency.
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*/
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L32_byte_cmp:
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cmp r2, #32
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blo L16_byte_cmp
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sub r2, r2, #32
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vld1.8 {d0 - d3}, [r0]!
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vld1.8 {d4 - d7}, [r1]!
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vsub.i8 q0, q0, q2 @ q0: Difference of the first 16 bytes
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vsub.i8 q1, q1, q3 @ q1: Difference of the last 16 bytes
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pld [r0, #64]
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pld [r1, #64]
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vorr d4, d0, d1 @ d4: Save the result of calculating whether the first 16 bytes are equal.
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vorr d5, d2, d3 @ d5: Save the result of calculating whether the last 16 bytes are equal.
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vorr d6, d4, d5 @ d6: Save the result of 32 bytes calculation whether they are equal.
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vmov r3, r4, d6
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orr r5, r3, r4
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cmp r5, #0
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beq L32_byte_cmp
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/**
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* Going to the diff branch shows that a certain byte must be different at this time.
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* We use r3 to indicate whether the first half of the multibytes are equal,
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* and r4 to indicate whether the second half of the multibytes are equal.
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*/
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L32_byte_diff:
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vmov r3, r4, d4
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orr r3, r3, r4
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/**
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* Adjust the two pointers back.
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*/
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sub r0, #32
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sub r1, #32
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cmp r3, #0
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addeq r0, #16
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addeq r1, #16
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beq L16_byte_diff_back
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vmov r3, r4, d0
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vmov r5, r6, d1
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b L16_byte_diff
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L16_byte_diff_back:
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vmov r3, r4, d2
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vmov r5, r6, d3
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L16_byte_diff:
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orr r7, r3, r4
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cmp r7, #0
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addeq r0, #8
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addeq r1, #8
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beq L8_byte_diff_back
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b L8_byte_diff
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L8_byte_diff_back:
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mov r3, r5
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mov r4, r6
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L8_byte_diff:
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cmp r3, #0
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addeq r0, #4
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addeq r1, #4
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beq L4_byte_diff
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L4_byte_diff:
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ldrb r5, [r0], #1
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ldrb r6, [r1], #1
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subs r5, r5, r6
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beq L4_byte_diff
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mov r0, r5
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b Lreturn
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/**
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* The dichotomy handles the case of less than 32 bytes.
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*/
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L16_byte_cmp:
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cmp r2, #16
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blo L8_byte_cmp
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sub r2, r2, #16
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vld1.8 {d0 - d1}, [r0]!
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vld1.8 {d4 - d5}, [r1]!
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vsub.i8 q0, q0, q2
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pld [r0, #64]
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pld [r1, #64]
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vorr d4, d0, d1
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vmov r3, r4, d4
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orr r3, r3, r4
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cmp r3, #0
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beq L8_byte_cmp
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sub r0, #16
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sub r1, #16
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vmov r3, r4, d0
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vmov r5, r6, d1
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b L16_byte_diff
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L8_byte_cmp:
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cmp r2, #8
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blo L4_byte_cmp
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sub r2, r2, #8
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vld1.8 {d0}, [r0]!
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vld1.8 {d4}, [r1]!
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vsub.i8 d0, d0, d4
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vmov r3, r4, d0
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orr r7, r3, r4
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cmp r7, #0
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beq L4_byte_cmp
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sub r0, #8
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sub r1, #8
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b L8_byte_diff
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L4_byte_cmp:
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cmp r2, #4
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blo Lless_4_byte_cmp
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sub r2, r2, #4
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ldr r3, [r0], #4
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ldr r4, [r1], #4
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cmp r3, r4
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beq Lless_4_byte_cmp
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sub r0, #4
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sub r1, #4
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b L4_byte_diff
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Lless_4_byte_cmp:
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cmp r2, #0
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beq Lreturn_0
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sub r2, r2, #1
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ldrb r3, [r0], #1
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ldrb r4, [r1], #1
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sub r5, r3, r4
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cmp r5, #0
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movne r0, r5
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bne Lreturn
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b Lless_4_byte_cmp
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Lreturn_0:
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mov r0, #0
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Lreturn:
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pop {r4, r5, r6, r7, pc}
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Lfunc_end:
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.size memcmp, Lfunc_end - memcmp
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.cantunwind
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.fnend @ -- End function
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@ -0,0 +1,128 @@
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/*
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* Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
|
||||||
|
* are permitted provided that the following conditions are met:
|
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|
*
|
||||||
|
* 1. Redistributions of source code must retain the above copyright notice, this list of
|
||||||
|
* conditions and the following disclaimer.
|
||||||
|
*
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
|
||||||
|
* of conditions and the following disclaimer in the documentation and/or other materials
|
||||||
|
* provided with the distribution.
|
||||||
|
*
|
||||||
|
* 3. Neither the name of the copyright holder nor the names of its contributors may be used
|
||||||
|
* to endorse or promote products derived from this software without specific prior written
|
||||||
|
* permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||||
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
|
||||||
|
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||||
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
|
||||||
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||||||
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||||||
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
||||||
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
||||||
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
||||||
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
||||||
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
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|
|
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.syntax unified
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.arch armv7-a
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.fpu neon
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.globl memset @ -- Begin function memset
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.p2align 2
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.type memset,%function
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|
memset:
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|
@ r0 = address
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|
@ r1 = char
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|
@ r2 = count
|
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|
@ returns original address in r0
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.fnstart
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|
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|
push {r4}
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cmp r2, #0
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|
beq Lreturn
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vdup.8 q0, r1
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|
mov r4, r0 @ r4 = r0 = address
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|
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|
L64_byte_alignment:
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|
ands r3, r0, #7
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|
beq L64_byte_aligned
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rsb r3, r3, #8 @ r3 = unalignedCnt = 8 - (address % 7)
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cmp r2, r3
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|
movlo r3, r2
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sub r2, r2, r3
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|
|
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|
Lloop1:
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|
strb r1, [r4], #1
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|
subs r3, r3, #1
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|
bgt Lloop1
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|
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/**
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|
* Set 64 bytes each time, and use floating-point registers to improve efficiency.
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*/
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L64_byte_aligned:
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|
vmov q1, q0
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|
vmov q2, q0
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|
cmp r2, #64
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|
blo L32_byte_aligned
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vmov q3, q0
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sub r2, r2, #64
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Lloop2:
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|
vstmia r4!, {d0 - d7}
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|
subs r2, r2, #64
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|
bgt Lloop2
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|
|
||||||
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/**
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|
* The dichotomy handles the case of less than 64 bytes,
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* and the front will subtract 64 more, and you need to make it up at this time.
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*/
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|
add r2, r2, #64
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L32_byte_aligned:
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|
cmp r2, #0
|
||||||
|
beq Lreturn
|
||||||
|
cmp r2, #32
|
||||||
|
blo L16_byte_aligned
|
||||||
|
sub r2, r2, #32
|
||||||
|
vstmia r4!, {d0 - d3}
|
||||||
|
|
||||||
|
L16_byte_aligned:
|
||||||
|
cmp r2, #0
|
||||||
|
beq Lreturn
|
||||||
|
cmp r2, #16
|
||||||
|
blo L8_byte_aligned
|
||||||
|
sub r2, r2, #16
|
||||||
|
vstmia r4!, {d0 - d1}
|
||||||
|
|
||||||
|
L8_byte_aligned:
|
||||||
|
cmp r2, #0
|
||||||
|
beq Lreturn
|
||||||
|
cmp r2, #8
|
||||||
|
blo L4_byte_aligned
|
||||||
|
sub r2, r2, #8
|
||||||
|
vstmia r4!, {d0}
|
||||||
|
|
||||||
|
L4_byte_aligned:
|
||||||
|
cmp r2, #0
|
||||||
|
beq Lreturn
|
||||||
|
cmp r2, #4
|
||||||
|
blo Lless_4_byte
|
||||||
|
sub r2, r2, #4
|
||||||
|
vst1.32 {d0[0]}, [r4]!
|
||||||
|
|
||||||
|
Lless_4_byte:
|
||||||
|
cmp r2, #0
|
||||||
|
beq Lreturn
|
||||||
|
strb r1, [r4], #1
|
||||||
|
sub r2, r2, #1
|
||||||
|
b Lless_4_byte
|
||||||
|
|
||||||
|
Lreturn:
|
||||||
|
pop {r4}
|
||||||
|
bx lr
|
||||||
|
Lfunc_end:
|
||||||
|
.size memset, Lfunc_end - memset
|
||||||
|
.cantunwind
|
||||||
|
.fnend @ -- End function
|
||||||
|
|
@ -0,0 +1,74 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without modification,
|
||||||
|
* are permitted provided that the following conditions are met:
|
||||||
|
*
|
||||||
|
* 1. Redistributions of source code must retain the above copyright notice, this list of
|
||||||
|
* conditions and the following disclaimer.
|
||||||
|
*
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
|
||||||
|
* of conditions and the following disclaimer in the documentation and/or other materials
|
||||||
|
* provided with the distribution.
|
||||||
|
*
|
||||||
|
* 3. Neither the name of the copyright holder nor the names of its contributors may be used
|
||||||
|
* to endorse or promote products derived from this software without specific prior written
|
||||||
|
* permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||||
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
|
||||||
|
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||||
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
|
||||||
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||||||
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||||||
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
||||||
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
||||||
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
||||||
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
||||||
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <string.h>
|
||||||
|
#include <stdint.h>
|
||||||
|
|
||||||
|
int memcmp(const void *str1, const void *str2, size_t n)
|
||||||
|
{
|
||||||
|
|
||||||
|
const unsigned char *s1 = str1;
|
||||||
|
const unsigned char *s2 = str2;
|
||||||
|
|
||||||
|
while (n >= 8) {
|
||||||
|
if (*(const uint64_t *)(s1) != *(const uint64_t *)(s2)) {
|
||||||
|
goto L8_byte_diff;
|
||||||
|
}
|
||||||
|
s1 += 8;
|
||||||
|
s2 += 8;
|
||||||
|
n -= 8;
|
||||||
|
}
|
||||||
|
if (n == 0) return 0;
|
||||||
|
|
||||||
|
|
||||||
|
/* L4_byte_cmp */
|
||||||
|
if (n >= 4) {
|
||||||
|
if (*(const uint32_t *)(s1) != *(const uint32_t *)(s2)) {
|
||||||
|
goto L4_byte_diff;
|
||||||
|
}
|
||||||
|
s1 += 4;
|
||||||
|
s2 += 4;
|
||||||
|
n -= 4;
|
||||||
|
}
|
||||||
|
if (n == 0) return 0;
|
||||||
|
|
||||||
|
L4_byte_diff:
|
||||||
|
for (; n && (*s1 == *s2); n--, s1++, s2++);
|
||||||
|
return n ? *s1 - *s2 : 0;
|
||||||
|
|
||||||
|
L8_byte_diff:
|
||||||
|
if (*(const uint32_t *)(s1) != *(const uint32_t *)(s2)) {
|
||||||
|
goto L4_byte_diff;
|
||||||
|
}
|
||||||
|
s1 += 4;
|
||||||
|
s2 += 4;
|
||||||
|
n -= 4;
|
||||||
|
goto L4_byte_diff;
|
||||||
|
}
|
||||||
|
|
@ -0,0 +1,107 @@
|
||||||
|
/*
|
||||||
|
* Copyright (c) 2021-2021 Huawei Device Co., Ltd. All rights reserved.
|
||||||
|
*
|
||||||
|
* Redistribution and use in source and binary forms, with or without modification,
|
||||||
|
* are permitted provided that the following conditions are met:
|
||||||
|
*
|
||||||
|
* 1. Redistributions of source code must retain the above copyright notice, this list of
|
||||||
|
* conditions and the following disclaimer.
|
||||||
|
*
|
||||||
|
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
|
||||||
|
* of conditions and the following disclaimer in the documentation and/or other materials
|
||||||
|
* provided with the distribution.
|
||||||
|
*
|
||||||
|
* 3. Neither the name of the copyright holder nor the names of its contributors may be used
|
||||||
|
* to endorse or promote products derived from this software without specific prior written
|
||||||
|
* permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||||
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
|
||||||
|
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||||
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
|
||||||
|
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||||||
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||||||
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
||||||
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
||||||
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
||||||
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
||||||
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <stdint.h>
|
||||||
|
|
||||||
|
void *memset(void *dest, int c, size_t n)
|
||||||
|
{
|
||||||
|
char *pos = dest;
|
||||||
|
uint32_t c32 = 0;
|
||||||
|
uint64_t c64 = 0;
|
||||||
|
|
||||||
|
if (n == 0) return dest;
|
||||||
|
|
||||||
|
c = c & 0xFF;
|
||||||
|
if (c) {
|
||||||
|
c32 = c;
|
||||||
|
c32 |= c32 << 8;
|
||||||
|
c32 |= c32 << 16;
|
||||||
|
c64 = c32;
|
||||||
|
c64 |= c64 << 32;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (((uintptr_t)(pos) & 7) != 0) {
|
||||||
|
int unalignedCnt = 8 - ((uintptr_t)(pos) & 7);
|
||||||
|
if (n >= unalignedCnt) {
|
||||||
|
n = n - unalignedCnt;
|
||||||
|
} else {
|
||||||
|
unalignedCnt = n;
|
||||||
|
n = 0;
|
||||||
|
}
|
||||||
|
for (int loop = 1; loop <= unalignedCnt; ++loop) {
|
||||||
|
*pos = (char)c;
|
||||||
|
pos++;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* L32_byte_aligned */
|
||||||
|
while (n >= 32) {
|
||||||
|
*(uint64_t *)(pos) = c64;
|
||||||
|
*(uint64_t *)(pos + 8) = c64;
|
||||||
|
*(uint64_t *)(pos + 16) = c64;
|
||||||
|
*(uint64_t *)(pos + 24) = c64;
|
||||||
|
n -= 32;
|
||||||
|
pos += 32;
|
||||||
|
}
|
||||||
|
if (n == 0) return dest;
|
||||||
|
|
||||||
|
/* L16_byte_aligned */
|
||||||
|
if (n >= 16) {
|
||||||
|
*(uint64_t *)(pos) = c64;
|
||||||
|
*(uint64_t *)(pos + 8) = c64;
|
||||||
|
n -= 16;
|
||||||
|
pos += 16;
|
||||||
|
if (n == 0) return dest;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* L8_byte_aligned */
|
||||||
|
if (n >= 8) {
|
||||||
|
*(uint64_t *)(pos) = c64;
|
||||||
|
n -= 8;
|
||||||
|
pos += 8;
|
||||||
|
if (n == 0) return dest;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* L4_byte_aligned */
|
||||||
|
if (n >= 4) {
|
||||||
|
*(uint32_t *)(pos) = c32;
|
||||||
|
n -= 4;
|
||||||
|
pos += 4;
|
||||||
|
if (n == 0) return dest;
|
||||||
|
}
|
||||||
|
while (n--) {
|
||||||
|
*pos++ = c;
|
||||||
|
}
|
||||||
|
|
||||||
|
return dest;
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue