diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/strcmp.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/strcmp.S | 68 |
1 files changed, 38 insertions, 30 deletions
diff --git a/sysdeps/powerpc/powerpc64/strcmp.S b/sysdeps/powerpc/powerpc64/strcmp.S index 4fb31931c6..bc5f0c760d 100644 --- a/sysdeps/powerpc/powerpc64/strcmp.S +++ b/sysdeps/powerpc/powerpc64/strcmp.S @@ -1,5 +1,5 @@ /* Optimized strcmp implementation for PowerPC64. - Copyright (C) 1997, 1999, 2000, 2002 Free Software Foundation, Inc. + Copyright (C) 1997, 1999, 2000, 2002, 2003 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -31,42 +31,50 @@ EALIGN (BP_SYM(strcmp), 4, 0) #define rRTN r3 #define rSTR1 r3 /* first string arg */ #define rSTR2 r4 /* second string arg */ +/* Note: The Bounded pointer support in this code is broken. This code + was inherited from PPC32 and and that support was never completed. + Current PPC gcc does not support -fbounds-check or -fbounded-pointers. + These artifacts are left in the code as a reminder in case we need + bounded pointer support in the future. */ #if __BOUNDED_POINTERS__ # define rHIGH1 r11 # define rHIGH2 r12 #endif #define rWORD1 r5 /* current word in s1 */ #define rWORD2 r6 /* current word in s2 */ -#define rFEFE r7 /* constant 0xfefefeff (-0x01010101) */ -#define r7F7F r8 /* constant 0x7f7f7f7f */ -#define rNEG r9 /* ~(word in s1 | 0x7f7f7f7f) */ +#define rFEFE r7 /* constant 0xfefefefefefefeff (-0x0101010101010101) */ +#define r7F7F r8 /* constant 0x7f7f7f7f7f7f7f7f */ +#define rNEG r9 /* ~(word in s1 | 0x7f7f7f7f7f7f7f7f) */ #define rBITDIF r10 /* bits that differ in s1 & s2 words */ CHECK_BOUNDS_LOW (rSTR1, rTMP, rHIGH1) CHECK_BOUNDS_LOW (rSTR2, rTMP, rHIGH2) + dcbt 0,rSTR1 or rTMP, rSTR2, rSTR1 - clrldi. rTMP, rTMP, 62 + dcbt 0,rSTR2 + clrldi. rTMP, rTMP, 61 lis rFEFE, -0x101 bne L(unaligned) - lwz rWORD1, 0(rSTR1) - lwz rWORD2, 0(rSTR2) + ld rWORD1, 0(rSTR1) + ld rWORD2, 0(rSTR2) lis r7F7F, 0x7f7f addi rFEFE, rFEFE, -0x101 - clrldi rFEFE,rFEFE,32 /* clear upper 32 */ addi r7F7F, r7F7F, 0x7f7f + sldi rTMP, rFEFE, 32 + insrdi r7F7F, r7F7F, 32, 0 + add rFEFE, rFEFE, rTMP b L(g1) -L(g0): lwzu rWORD1, 4(rSTR1) +L(g0): ldu rWORD1, 8(rSTR1) bne cr1, L(different) - lwzu rWORD2, 4(rSTR2) + ldu rWORD2, 8(rSTR2) L(g1): add rTMP, rFEFE, rWORD1 nor rNEG, r7F7F, rWORD1 - clrldi rNEG,rNEG,32 /* clear upper 32 */ and. rTMP, rTMP, rNEG - cmpw cr1, rWORD1, rWORD2 + cmpd cr1, rWORD1, rWORD2 beq+ L(g0) L(endstring): /* OK. We've hit the end of the string. We need to be careful that @@ -77,32 +85,34 @@ L(endstring): add rTMP, rTMP, r7F7F xor. rBITDIF, rWORD1, rWORD2 - extsw. rBITDIF,rBITDIF /* propagate sign for blt */ andc rNEG, rNEG, rTMP blt- L(highbit) - cntlzw rBITDIF, rBITDIF - cntlzw rNEG, rNEG + cntlzd rBITDIF, rBITDIF + cntlzd rNEG, rNEG addi rNEG, rNEG, 7 - cmpw cr1, rNEG, rBITDIF + cmpd cr1, rNEG, rBITDIF sub rRTN, rWORD1, rWORD2 - extsw rRTN, rRTN - bgelr+ cr1 + blt- cr1, L(equal) + sradi rRTN, rRTN, 63 + ori rRTN, rRTN, 1 + blr L(equal): li rRTN, 0 /* GKM FIXME: check high bounds. */ blr L(different): - lwz rWORD1, -4(rSTR1) + ld rWORD1, -8(rSTR1) xor. rBITDIF, rWORD1, rWORD2 - - extsw. rBITDIF,rBITDIF /* propagate sign for bgelr */ sub rRTN, rWORD1, rWORD2 - extsw rRTN, rRTN - bgelr+ + blt- L(highbit) + sradi rRTN, rRTN, 63 + ori rRTN, rRTN, 1 + blr L(highbit): - ori rRTN, rWORD2, 1 - extsw rRTN, rRTN + srdi rWORD2, rWORD2, 56 + srdi rWORD1, rWORD1, 56 + sub rRTN, rWORD1, rWORD2 /* GKM FIXME: check high bounds. */ blr @@ -119,20 +129,18 @@ L(u0): lbzu rWORD1, 1(rSTR1) lbzu rWORD2, 1(rSTR2) L(u1): cmpwi cr1, rWORD1, 0 beq- cr1, L(u3) - cmpw rWORD1, rWORD2 + cmpd rWORD1, rWORD2 bne- L(u3) lbzu rWORD1, 1(rSTR1) lbzu rWORD2, 1(rSTR2) - cmpwi cr1, rWORD1, 0 - cmpw rWORD1, rWORD2 + cmpdi cr1, rWORD1, 0 + cmpd rWORD1, rWORD2 bne+ cr1, L(u0) L(u3): sub rRTN, rWORD1, rWORD2 - extsw rRTN, rRTN /* GKM FIXME: check high bounds. */ blr L(u4): lbz rWORD1, -1(rSTR1) sub rRTN, rWORD1, rWORD2 - extsw rRTN, rRTN /* GKM FIXME: check high bounds. */ blr END (BP_SYM (strcmp)) |