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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/lib/memcmp_32.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * memcmp for PowerPC32

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 *

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 * Copyright (C) 1996 Paul Mackerras.

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 *

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 */

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#include <linux/export.h>

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#include <asm/ppc_asm.h>

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	.text

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_GLOBAL(memcmp)

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	srawi.	r7, r5, 2		/* Divide len by 4 */

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	mr	r6, r3

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	beq-	3f

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	mtctr	r7

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	li	r7, 0

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1:	lwzx	r3, r6, r7

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	lwzx	r0, r4, r7

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	addi	r7, r7, 4

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	cmplw	cr0, r3, r0

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	bdnzt	eq, 1b

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	bne	5f

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3:	andi.	r3, r5, 3

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	beqlr

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	cmplwi	cr1, r3, 2

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	blt-	cr1, 4f

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	lhzx	r3, r6, r7

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	lhzx	r0, r4, r7

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	addi	r7, r7, 2

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	subf.	r3, r0, r3

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	beqlr	cr1

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	bnelr

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4:	lbzx	r3, r6, r7

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	lbzx	r0, r4, r7

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	subf.	r3, r0, r3

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	blr

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5:	li	r3, 1

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	bgtlr

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	li	r3, -1

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	blr

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EXPORT_SYMBOL(memcmp)

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