/* SPDX-License-Identifier: GPL-2.0 */

/*
 * memcmp for PowerPC32
 *
 * Copyright (C) 1996 Paul Mackerras.
 *
 */

#include <linux/export.h>
#include <asm/ppc_asm.h>

        .text

_GLOBAL(memcmp)
        srawi.  r7, r5, 2               /* Divide len by 4 */
        mr      r6, r3
        beq-    3f
        mtctr   r7
        li      r7, 0
1:      lwzx    r3, r6, r7
        lwzx    r0, r4, r7
        addi    r7, r7, 4
        cmplw   cr0, r3, r0
        bdnzt   eq, 1b
        bne     5f
3:      andi.   r3, r5, 3
        beqlr
        cmplwi  cr1, r3, 2
        blt-    cr1, 4f
        lhzx    r3, r6, r7
        lhzx    r0, r4, r7
        addi    r7, r7, 2
        subf.   r3, r0, r3
        beqlr   cr1
        bnelr
4:      lbzx    r3, r6, r7
        lbzx    r0, r4, r7
        subf.   r3, r0, r3
        blr
5:      li      r3, 1
        bgtlr
        li      r3, -1
        blr
EXPORT_SYMBOL(memcmp)