1/* 2 * Copyright (C) 2023 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28/* 29 * Copyright (c) 2023 SiFive, Inc. 30 * All rights reserved. 31 * 32 * Redistribution and use in source and binary forms, with or without 33 * modification, are permitted provided that the following conditions 34 * are met: 35 * 1. Redistributions of source code must retain the above copyright 36 * notice, this list of conditions and the following disclaimer. 37 * 2. Redistributions in binary form must reproduce the above copyright 38 * notice, this list of conditions and the following disclaimer in the 39 * documentation and/or other materials provided with the distribution. 40 * 3. The name of the company may not be used to endorse or promote 41 * products derived from this software without specific prior written 42 * permission. 43 * 44 * THIS SOFTWARE IS PROVIDED BY SIFIVE INC ``AS IS'' AND ANY EXPRESS OR IMPLIED 45 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 46 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 47 * IN NO EVENT SHALL SIFIVE INC BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 49 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 50 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 51 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 52 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 53 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 */ 55 56#include <private/bionic_asm.h> 57 58#define iResult a0 59 60#define pSrc1 a0 61#define pSrc2 a1 62#define iNum a2 63 64#define iVL a3 65#define iTemp a4 66#define iTemp1 a5 67#define iTemp2 a6 68 69#define ELEM_LMUL_SETTING m8 70#define vData1 v0 71#define vData2 v8 72#define vMask v16 73 74ENTRY(memcmp_v) 75 76L(loop): 77 vsetvli iVL, iNum, e8, ELEM_LMUL_SETTING, ta, ma 78 79 vle8.v vData1, (pSrc1) 80 vle8.v vData2, (pSrc2) 81 82 vmsne.vv vMask, vData1, vData2 83 sub iNum, iNum, iVL 84 vfirst.m iTemp, vMask 85 86 /* skip the loop if we find the different 87 value between pSrc1 and pSrc2. */ 88 bgez iTemp, L(found) 89 90 add pSrc1, pSrc1, iVL 91 add pSrc2, pSrc2, iVL 92 93 bnez iNum, L(loop) 94 95 li iResult, 0 96 ret 97 98L(found): 99 add pSrc1, pSrc1, iTemp 100 add pSrc2, pSrc2, iTemp 101 lbu iTemp1, 0(pSrc1) 102 lbu iTemp2, 0(pSrc2) 103 sub iResult, iTemp1, iTemp2 104 ret 105 106END(memcmp_v) 107