tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel / arch / powerpc / lib / memcmp_32.S
at v5.10-rc2 45 lines 625 B view raw
1/* SPDX-License-Identifier: GPL-2.0 */ 2 3/* 4 * memcmp for PowerPC32 5 * 6 * Copyright (C) 1996 Paul Mackerras. 7 * 8 */ 9 10#include <asm/ppc_asm.h> 11#include <asm/export.h> 12 13 .text 14 15_GLOBAL(memcmp) 16 srawi. r7, r5, 2 /* Divide len by 4 */ 17 mr r6, r3 18 beq- 3f 19 mtctr r7 20 li r7, 0 211: lwzx r3, r6, r7 22 lwzx r0, r4, r7 23 addi r7, r7, 4 24 cmplw cr0, r3, r0 25 bdnzt eq, 1b 26 bne 5f 273: andi. r3, r5, 3 28 beqlr 29 cmplwi cr1, r3, 2 30 blt- cr1, 4f 31 lhzx r3, r6, r7 32 lhzx r0, r4, r7 33 addi r7, r7, 2 34 subf. r3, r0, r3 35 beqlr cr1 36 bnelr 374: lbzx r3, r6, r7 38 lbzx r0, r4, r7 39 subf. r3, r0, r3 40 blr 415: li r3, 1 42 bgtlr 43 li r3, -1 44 blr 45EXPORT_SYMBOL(memcmp)