[PPC64] strncpy optimization
Assembly optimization of strncpy for PowerPC64, using double words instead of bytes to copy strings. Submitted by: Leonardo Bianconi <leonardo.bianconi_eldorado.org.br> (original version) Reviewed by: jhibbits Differential Revision: https://reviews.freebsd.org/D15369
This commit is contained in:
Leandro Lupori
parent
075fb85f09
commit
181e35008c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=356766
@ -3,4 +3,7 @@
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MDSRCS+= \
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strcpy_arch_2_05.S \
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strcpy.c \
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strcpy_resolver.c
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strcpy_resolver.c \
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strncpy_arch_2_05.S \
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strncpy.c \
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strncpy_resolver.c
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33
lib/libc/powerpc64/string/strncpy.c
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33
lib/libc/powerpc64/string/strncpy.c
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@ -0,0 +1,33 @@
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/*-
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* Copyright (c) 2019 Leandro Lupori
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of its contributors may
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* be used to endorse or promote products derived from this software
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define WEAK_STRNCPY
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#include "../../string/strncpy.c"
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131
lib/libc/powerpc64/string/strncpy_arch_2_05.S
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131
lib/libc/powerpc64/string/strncpy_arch_2_05.S
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@ -0,0 +1,131 @@
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/*-
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* Copyright (c) 2018 Instituto de Pesquisas Eldorado
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of its contributors may
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* be used to endorse or promote products derived from this software
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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ENTRY(__strncpy_arch_2_05)
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stdu %r1,-40(%r1)
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mflr %r0
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std %r0,16(%r1)
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std %r3,32(%r1)
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xor %r6,%r6,%r6 /* fixed 0 reg */
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/* align loop */
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addi %r3,%r3,-1
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.Lalign_loop:
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/* len? */
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cmpdi %r5,0
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beq .Lexit
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/* aligned? */
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andi. %r0,%r4,7
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beq .Ldw_copy
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/* copy */
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lbz %r7,0(%r4)
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stbu %r7,1(%r3)
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addi %r4,%r4,1
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addi %r5,%r5,-1
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/* zero? */
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cmpdi %r7,0
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beq .Lzero
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b .Lalign_loop
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/* dword copy loop */
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.Ldw_copy:
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/* prepare src and dst to use load/store and update */
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addi %r3,%r3,-7
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addi %r4,%r4,-8
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.Ldw_copy_loop:
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cmpdi %r5,8
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blt .Lbyte_copy
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ldu %r0,8(%r4)
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/* check for 0 */
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cmpb %r7,%r0,%r6
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cmpdi %r7,0
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bne .Lbyte_copy_and_zero
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/* copy to dst */
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stdu %r0,8(%r3)
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addi %r5,%r5,-8
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b .Ldw_copy_loop
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/* Copy remaining src bytes, zero-out buffer
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* Note: r5 will be >= 8
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*/
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.Lbyte_copy_and_zero:
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addi %r3,%r3,7
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addi %r4,%r4,-1
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.Lbyte_copy_and_zero_loop:
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lbzu %r7,1(%r4)
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stbu %r7,1(%r3)
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addi %r5,%r5,-1
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cmpdi %r7,0
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beq .Lzero
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b .Lbyte_copy_and_zero_loop
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/* zero-out remaining dst bytes */
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.Lzero:
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addi %r3,%r3,1
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li %r4,0
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/* r5 has len already */
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bl memset
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nop
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b .Lexit
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/* copy remaining (< 8) bytes */
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.Lbyte_copy:
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cmpdi %r5,0
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beq .Lexit
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addi %r3,%r3,7
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addi %r4,%r4,7
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mtctr %r5
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.Lbyte_copy_loop:
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lbzu %r7,1(%r4)
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stbu %r7,1(%r3)
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cmpdi %r7,0
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/* 0 found: zero out remaining bytes */
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beq .Lbyte_copy_zero
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bdnz .Lbyte_copy_loop
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b .Lexit
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.Lbyte_copy_zero_loop:
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stbu %r6,1(%r3)
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.Lbyte_copy_zero:
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bdnz .Lbyte_copy_zero_loop
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.Lexit:
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/* epilogue */
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ld %r3,32(%r1)
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ld %r0,16(%r1)
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mtlr %r0
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addi %r1,%r1,40
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blr
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END(__strncpy_arch_2_05)
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.section .note.GNU-stack,"",%progbits
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48
lib/libc/powerpc64/string/strncpy_resolver.c
Normal file
48
lib/libc/powerpc64/string/strncpy_resolver.c
Normal file
@ -0,0 +1,48 @@
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/*-
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* Copyright (c) 2019 Leandro Lupori
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of its contributors may
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* be used to endorse or promote products derived from this software
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <machine/cpu.h>
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#include <machine/ifunc.h>
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char *
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__strncpy_arch_2_05(char * restrict dst, const char * restrict src, size_t len);
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char *
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__strncpy(char * restrict dst, const char * restrict src, size_t len);
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DEFINE_UIFUNC(, char *, strncpy,
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(char * restrict, const char * restrict, size_t))
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{
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if (cpu_features & PPC_FEATURE_ARCH_2_05)
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return (__strncpy_arch_2_05);
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else
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return (__strncpy);
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}
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@ -44,8 +44,17 @@ __FBSDID("$FreeBSD$");
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* Copy src to dst, truncating or null-padding to always copy n bytes.
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* Return dst.
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*/
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#ifdef WEAK_STRNCPY
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__weak_reference(__strncpy, strncpy);
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#endif
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char *
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strncpy(char * __restrict dst, const char * __restrict src, size_t n)
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#ifdef WEAK_STRNCPY
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__strncpy
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#else
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strncpy
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#endif
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(char * __restrict dst, const char * __restrict src, size_t n)
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{
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if (n != 0) {
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char *d = dst;
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