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e16c18650c
For copies shorter than 512 bytes, the data is copied using plain ld/std instructions. For 512 bytes or more, the copy is done in 3 phases: Phase 1: copy from the src buffer until it's aligned at a 16-byte boundary Phase 2: copy as many aligned 64-byte blocks from the src buffer as possible Phase 3: copy the remaining data, if any In phase 2, this code uses VSX instructions when available. Otherwise, it uses ldx/stdx. Submitted by: Luis Pires <lffpires_ruabrasil.org> (original version) Reviewed by: jhibbits Differential Revision: https://reviews.freebsd.org/D15118
65 lines
2.3 KiB
ArmAsm
65 lines
2.3 KiB
ArmAsm
/*-
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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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* $FreeBSD$
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*/
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#define FN_NAME __memcpy_vsx
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#define BLOCK_BITS 6
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/*
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* r5: bytes to copy (multiple of BLOCK_BYTES)
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*
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*/
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#define FN_COPY_LOOP \
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/* Load CTR with number of blocks */ \
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srdi %r5, %r5, BLOCK_BITS ;\
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mtctr %r5 ;\
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/* Prepare indexes to load and store data */ \
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xor %r6, %r6, %r6 ;\
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li %r9, 16 ;\
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li %r10, 32 ;\
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li %r11, 48 ;\
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.Lcopy_vsx_loop: \
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lxvd2x %vs6, %r6, %r4 ;\
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lxvd2x %vs7, %r9, %r4 ;\
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lxvd2x %vs8, %r10, %r4 ;\
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lxvd2x %vs9, %r11, %r4 ;\
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stxvd2x %vs6, %r6, %r3 ;\
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stxvd2x %vs7, %r9, %r3 ;\
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stxvd2x %vs8, %r10, %r3 ;\
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stxvd2x %vs9, %r11, %r3 ;\
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\
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addi %r3, %r3, BLOCK_BYTES ;\
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addi %r4, %r4, BLOCK_BYTES ;\
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bdnz .Lcopy_vsx_loop ;\
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\
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/* Check if there is remaining bytes */ \
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cmpd %r7, 0 ;\
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beq .Lexit ;\
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#include "memcpy.S"
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