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/*
* Author: Anton Blanchard <anton@au.ibm.com>
* Copyright 2015 IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <asm/ppc_asm.h>
#include <asm/export.h>
#define off8 r6
#define off16 r7
#define off24 r8
#define rA r9
#define rB r10
#define rC r11
#define rD r27
#define rE r28
#define rF r29
#define rG r30
#define rH r31
#ifdef __LITTLE_ENDIAN__
#define LD ldbrx
#else
#define LD ldx
#endif
_GLOBAL(memcmp)
cmpdi cr1,r5,0
/* Use the short loop if both strings are not 8B aligned */
or r6,r3,r4
andi. r6,r6,7
/* Use the short loop if length is less than 32B */
cmpdi cr6,r5,31
beq cr1,.Lzero
bne .Lshort
bgt cr6,.Llong
.Lshort:
mtctr r5
1: lbz rA,0(r3)
lbz rB,0(r4)
subf. rC,rB,rA
bne .Lnon_zero
bdz .Lzero
lbz rA,1(r3)
lbz rB,1(r4)
subf. rC,rB,rA
bne .Lnon_zero
bdz .Lzero
lbz rA,2(r3)
lbz rB,2(r4)
subf. rC,rB,rA
bne .Lnon_zero
bdz .Lzero
lbz rA,3(r3)
lbz rB,3(r4)
subf. rC,rB,rA
bne .Lnon_zero
addi r3,r3,4
addi r4,r4,4
bdnz 1b
.Lzero:
li r3,0
blr
.Lnon_zero:
mr r3,rC
blr
.Llong:
li off8,8
li off16,16
li off24,24
std r31,-8(r1)
std r30,-16(r1)
std r29,-24(r1)
std r28,-32(r1)
std r27,-40(r1)
srdi r0,r5,5
mtctr r0
andi. r5,r5,31
LD rA,0,r3
LD rB,0,r4
LD rC,off8,r3
LD rD,off8,r4
LD rE,off16,r3
LD rF,off16,r4
LD rG,off24,r3
LD rH,off24,r4
cmpld cr0,rA,rB
addi r3,r3,32
addi r4,r4,32
bdz .Lfirst32
LD rA,0,r3
LD rB,0,r4
cmpld cr1,rC,rD
LD rC,off8,r3
LD rD,off8,r4
cmpld cr6,rE,rF
LD rE,off16,r3
LD rF,off16,r4
cmpld cr7,rG,rH
bne cr0,.LcmpAB
LD rG,off24,r3
LD rH,off24,r4
cmpld cr0,rA,rB
bne cr1,.LcmpCD
addi r3,r3,32
addi r4,r4,32
bdz .Lsecond32
.balign 16
1: LD rA,0,r3
LD rB,0,r4
cmpld cr1,rC,rD
bne cr6,.LcmpEF
LD rC,off8,r3
LD rD,off8,r4
cmpld cr6,rE,rF
bne cr7,.LcmpGH
LD rE,off16,r3
LD rF,off16,r4
cmpld cr7,rG,rH
bne cr0,.LcmpAB
LD rG,off24,r3
LD rH,off24,r4
cmpld cr0,rA,rB
bne cr1,.LcmpCD
addi r3,r3,32
addi r4,r4,32
bdnz 1b
.Lsecond32:
cmpld cr1,rC,rD
bne cr6,.LcmpEF
cmpld cr6,rE,rF
bne cr7,.LcmpGH
cmpld cr7,rG,rH
bne cr0,.LcmpAB
bne cr1,.LcmpCD
bne cr6,.LcmpEF
bne cr7,.LcmpGH
.Ltail:
ld r31,-8(r1)
ld r30,-16(r1)
ld r29,-24(r1)
ld r28,-32(r1)
ld r27,-40(r1)
cmpdi r5,0
beq .Lzero
b .Lshort
.Lfirst32:
cmpld cr1,rC,rD
cmpld cr6,rE,rF
cmpld cr7,rG,rH
bne cr0,.LcmpAB
bne cr1,.LcmpCD
bne cr6,.LcmpEF
bne cr7,.LcmpGH
b .Ltail
.LcmpAB:
li r3,1
bgt cr0,.Lout
li r3,-1
b .Lout
.LcmpCD:
li r3,1
bgt cr1,.Lout
li r3,-1
b .Lout
.LcmpEF:
li r3,1
bgt cr6,.Lout
li r3,-1
b .Lout
.LcmpGH:
li r3,1
bgt cr7,.Lout
li r3,-1
.Lout:
ld r31,-8(r1)
ld r30,-16(r1)
ld r29,-24(r1)
ld r28,-32(r1)
ld r27,-40(r1)
blr
EXPORT_SYMBOL(memcmp)
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