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memset.S


products/Sources/formale Sprachen/C/Linux/arch/openrisc/lib/memset.S

/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * OpenRISC memset.S * * Hand-optimized assembler version of memset for OpenRISC. * Algorithm inspired by several other arch-specific memset routines * in the kernel tree * * Copyright (C) 2015 Olof Kindgren */ .global memset .type memset, @function memset: /* arguments: * r3 = *s * r4 = c * r5 = n * r13, r15, r17, r19 used as temp regs */ /* Exit if n == 0 */ l.sfeqi r5, 0 l.bf 4f /* Truncate c to char */ l.andi r13, r4, 0xff /* Skip word extension if c is 0 */ l.sfeqi r13, 0 l.bf 1f /* Check for at least two whole words (8 bytes) */ l.sfleui r5, 7 /* Extend char c to 32-bit word cccc in r13 */ l.slli r15, r13, 16 // r13 = 000c, r15 = 0c00 l.or r13, r13, r15 // r13 = 0c0c, r15 = 0c00 l.slli r15, r13, 8 // r13 = 0c0c, r15 = c0c0 l.or r13, r13, r15 // r13 = cccc, r15 = c0c0 1: l.addi r19, r3, 0 // Set r19 = src /* Jump to byte copy loop if less than two words */ l.bf 3f l.or r17, r5, r0 // Set r17 = n /* Mask out two LSBs to check alignment */ l.andi r15, r3, 0x3 /* lsb == 00, jump to word copy loop */ l.sfeqi r15, 0 l.bf 2f l.addi r19, r3, 0 // Set r19 = src /* lsb == 01,10 or 11 */ l.sb 0(r3), r13 // *src = c l.addi r17, r17, -1 // Decrease n l.sfeqi r15, 3 l.bf 2f l.addi r19, r3, 1 // src += 1 /* lsb == 01 or 10 */ l.sb 1(r3), r13 // *(src+1) = c l.addi r17, r17, -1 // Decrease n l.sfeqi r15, 2 l.bf 2f l.addi r19, r3, 2 // src += 2 /* lsb == 01 */ l.sb 2(r3), r13 // *(src+2) = c l.addi r17, r17, -1 // Decrease n l.addi r19, r3, 3 // src += 3 /* Word copy loop */ 2: l.sw 0(r19), r13 // *src = cccc l.addi r17, r17, -4 // Decrease n l.sfgeui r17, 4 l.bf 2b l.addi r19, r19, 4 // Increase src /* When n > 0, copy the remaining bytes, otherwise jump to exit */ l.sfeqi r17, 0 l.bf 4f /* Byte copy loop */ 3: l.addi r17, r17, -1 // Decrease n l.sb 0(r19), r13 // *src = cccc l.sfnei r17, 0 l.bf 3b l.addi r19, r19, 1 // Increase src 4: l.jr r9 l.ori r11, r3, 0

                                                                                                                                                                                                                                                                                                                                                                                                     

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