diff options
| -rw-r--r-- | arch/powerpc/lib/Makefile | 3 | ||||
| -rw-r--r-- | arch/powerpc/lib/memcmp_64.S | 233 | ||||
| -rw-r--r-- | arch/powerpc/lib/string.S | 2 |
3 files changed, 237 insertions, 1 deletions
diff --git a/arch/powerpc/lib/Makefile b/arch/powerpc/lib/Makefile index 1b01159b81f3..5526156aae5f 100644 --- a/arch/powerpc/lib/Makefile +++ b/arch/powerpc/lib/Makefile @@ -15,7 +15,8 @@ obj-$(CONFIG_PPC32) += div64.o copy_32.o obj-$(CONFIG_PPC64) += copypage_64.o copyuser_64.o \ usercopy_64.o mem_64.o hweight_64.o \ - copyuser_power7.o string_64.o copypage_power7.o + copyuser_power7.o string_64.o copypage_power7.o \ + memcmp_64.o ifeq ($(CONFIG_GENERIC_CSUM),) obj-y += checksum_$(CONFIG_WORD_SIZE).o obj-$(CONFIG_PPC64) += checksum_wrappers_64.o diff --git a/arch/powerpc/lib/memcmp_64.S b/arch/powerpc/lib/memcmp_64.S new file mode 100644 index 000000000000..8953d2382a65 --- /dev/null +++ b/arch/powerpc/lib/memcmp_64.S @@ -0,0 +1,233 @@ +/* + * 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> + +#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 diff --git a/arch/powerpc/lib/string.S b/arch/powerpc/lib/string.S index 1b5a0a09d609..c80fb49ce607 100644 --- a/arch/powerpc/lib/string.S +++ b/arch/powerpc/lib/string.S @@ -93,6 +93,7 @@ _GLOBAL(strlen) subf r3,r3,r4 blr +#ifdef CONFIG_PPC32 _GLOBAL(memcmp) PPC_LCMPI 0,r5,0 beq- 2f @@ -106,6 +107,7 @@ _GLOBAL(memcmp) blr 2: li r3,0 blr +#endif _GLOBAL(memchr) PPC_LCMPI 0,r5,0 |