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memchr.S
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memcmp.S
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memcpy.S
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memmove.S
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memset.S
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strchr.S
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strchrnul.S
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strcmp.S
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strcpy.S
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strlen.S
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strncmp.S
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strnlen.S
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Editing: memmove.S
/* Copyright (c) 2013, Linaro Limited All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * 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. * Neither the name of the Linaro 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. */ /* * Copyright (c) 2015 ARM 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. The name of the company may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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. */ /* Assumptions: * * ARMv8-a, AArch64, unaligned accesses */ .macro def_fn f p2align=0 .text .p2align \p2align .global \f .type \f, %function \f: .endm /* Parameters and result. */ #define dstin x0 #define src x1 #define count x2 #define srcend x3 #define dstend x4 #define tmp1 x5 #define A_l x6 #define A_h x7 #define B_l x8 #define B_h x9 #define C_l x10 #define C_h x11 #define D_l x12 #define D_h x13 #define E_l count #define E_h tmp1 /* All memmoves up to 96 bytes are done by memcpy as it supports overlaps. Larger backwards copies are also handled by memcpy. The only remaining case is forward large copies. The destination is aligned, and an unrolled loop processes 64 bytes per iteration. */ def_fn memmove, 6 sub tmp1, dstin, src cmp count, 96 ccmp tmp1, count, 2, hi b.hs memcpy cbz tmp1, 3f add dstend, dstin, count add srcend, src, count /* Align dstend to 16 byte alignment so that we don't cross cache line boundaries on both loads and stores. There are at least 96 bytes to copy, so copy 16 bytes unaligned and then align. The loop copies 64 bytes per iteration and prefetches one iteration ahead. */ and tmp1, dstend, 15 ldp D_l, D_h, [srcend, -16] sub srcend, srcend, tmp1 sub count, count, tmp1 ldp A_l, A_h, [srcend, -16] stp D_l, D_h, [dstend, -16] ldp B_l, B_h, [srcend, -32] ldp C_l, C_h, [srcend, -48] ldp D_l, D_h, [srcend, -64]! sub dstend, dstend, tmp1 subs count, count, 128 b.ls 2f nop 1: stp A_l, A_h, [dstend, -16] ldp A_l, A_h, [srcend, -16] stp B_l, B_h, [dstend, -32] ldp B_l, B_h, [srcend, -32] stp C_l, C_h, [dstend, -48] ldp C_l, C_h, [srcend, -48] stp D_l, D_h, [dstend, -64]! ldp D_l, D_h, [srcend, -64]! subs count, count, 64 b.hi 1b /* Write the last full set of 64 bytes. The remainder is at most 64 bytes, so it is safe to always copy 64 bytes from the start even if there is just 1 byte left. */ 2: ldp E_l, E_h, [src, 48] stp A_l, A_h, [dstend, -16] ldp A_l, A_h, [src, 32] stp B_l, B_h, [dstend, -32] ldp B_l, B_h, [src, 16] stp C_l, C_h, [dstend, -48] ldp C_l, C_h, [src] stp D_l, D_h, [dstend, -64] stp E_l, E_h, [dstin, 48] stp A_l, A_h, [dstin, 32] stp B_l, B_h, [dstin, 16] stp C_l, C_h, [dstin] 3: ret .size memmove, . - memmove
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