diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/strcpy.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/strcpy.S | 61 |
1 files changed, 42 insertions, 19 deletions
diff --git a/sysdeps/powerpc/powerpc64/strcpy.S b/sysdeps/powerpc/powerpc64/strcpy.S index 2015eff5c6..40fe31039a 100644 --- a/sysdeps/powerpc/powerpc64/strcpy.S +++ b/sysdeps/powerpc/powerpc64/strcpy.S @@ -1,5 +1,5 @@ /* Optimized strcpy 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 @@ -29,6 +29,11 @@ EALIGN (BP_SYM (strcpy), 4, 0) #define rTMP r0 #define rRTN r3 /* incoming DEST arg preserved as result */ +/* 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 rDEST r4 /* pointer to previous word in dest */ # define rSRC r5 /* pointer to previous word in src */ @@ -39,39 +44,44 @@ EALIGN (BP_SYM (strcpy), 4, 0) # define rDEST r5 /* pointer to previous word in dest */ #endif #define rWORD r6 /* current word from src */ -#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 rALT r10 /* alternate word from src */ CHECK_BOUNDS_LOW (rSRC, rLOW, rHIGH) CHECK_BOUNDS_LOW (rDEST, rLOW, rHIGH) STORE_RETURN_BOUNDS (rLOW, rHIGH) + dcbt 0,rSRC or rTMP, rSRC, rRTN - clrldi. rTMP, rTMP, 62 + clrldi. rTMP, rTMP, 61 #if __BOUNDED_POINTERS__ - addi rDEST, rDEST, -4 + addi rDEST, rDEST, -8 #else - addi rDEST, rRTN, -4 + addi rDEST, rRTN, -8 #endif + dcbtst 0,rRTN bne L(unaligned) lis rFEFE, -0x101 lis r7F7F, 0x7f7f - lwz rWORD, 0(rSRC) + ld rWORD, 0(rSRC) addi rFEFE, rFEFE, -0x101 addi r7F7F, r7F7F, 0x7f7f + sldi rTMP, rFEFE, 32 + insrdi r7F7F, r7F7F, 32, 0 + add rFEFE, rFEFE, rTMP b L(g2) -L(g0): lwzu rALT, 4(rSRC) - stwu rWORD, 4(rDEST) +L(g0): ldu rALT, 8(rSRC) + stdu rWORD, 8(rDEST) add rTMP, rFEFE, rALT nor rNEG, r7F7F, rALT and. rTMP, rTMP, rNEG bne- L(g1) - lwzu rWORD, 4(rSRC) - stwu rALT, 4(rDEST) + ldu rWORD, 8(rSRC) + stdu rALT, 8(rDEST) L(g2): add rTMP, rFEFE, rWORD nor rNEG, r7F7F, rWORD and. rTMP, rTMP, rNEG @@ -79,16 +89,29 @@ L(g2): add rTMP, rFEFE, rWORD mr rALT, rWORD /* We've hit the end of the string. Do the rest byte-by-byte. */ -L(g1): rlwinm. rTMP, rALT, 8, 24, 31 - stb rTMP, 4(rDEST) +L(g1): + extrdi. rTMP, rALT, 8, 0 + stb rTMP, 8(rDEST) beqlr- - rlwinm. rTMP, rALT, 16, 24, 31 - stb rTMP, 5(rDEST) + extrdi. rTMP, rALT, 8, 8 + stb rTMP, 9(rDEST) beqlr- - rlwinm. rTMP, rALT, 24, 24, 31 - stb rTMP, 6(rDEST) + extrdi. rTMP, rALT, 8, 16 + stb rTMP, 10(rDEST) beqlr- - stb rALT, 7(rDEST) + extrdi. rTMP, rALT, 8, 24 + stb rTMP, 11(rDEST) + beqlr- + extrdi. rTMP, rALT, 8, 32 + stb rTMP, 12(rDEST) + beqlr- + extrdi. rTMP, rALT, 8, 40 + stb rTMP, 13(rDEST) + beqlr- + extrdi. rTMP, rALT, 8, 48 + stb rTMP, 14(rDEST) + beqlr- + stb rALT, 15(rDEST) /* GKM FIXME: check high bound. */ blr |