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Diffstat (limited to 'sysdeps/powerpc/powerpc32/stpcpy.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/stpcpy.S | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc32/stpcpy.S b/sysdeps/powerpc/powerpc32/stpcpy.S new file mode 100644 index 0000000000..9640a5d831 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/stpcpy.S @@ -0,0 +1,121 @@ +/* Optimized stpcpy implementation for PowerPC. + Copyright (C) 1997, 1999, 2000, 2002 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 + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include <bp-sym.h> +#include <bp-asm.h> + +/* See strlen.s for comments on how the end-of-string testing works. */ + +/* char * [r3] stpcpy (char *dest [r3], const char *src [r4]) */ + +EALIGN (BP_SYM (__stpcpy), 4, 0) + +#define rTMP r0 +#define rRTN r3 +#if __BOUNDED_POINTERS__ +# define rDEST r4 /* pointer to previous word in dest */ +# define rSRC r5 /* pointer to previous word in src */ +# define rLOW r11 +# define rHIGH r12 +#else +# define rDEST r3 /* pointer to previous word in dest */ +# define rSRC r4 /* pointer to previous word in src */ +#endif +#define rWORD r6 /* current word from src */ +#define rFEFE r7 /* 0xfefefeff */ +#define r7F7F r8 /* 0x7f7f7f7f */ +#define rNEG r9 /* ~(word in src | 0x7f7f7f7f) */ +#define rALT r10 /* alternate word from src */ + + CHECK_BOUNDS_LOW (rSRC, rLOW, rHIGH) + CHECK_BOUNDS_LOW (rDEST, rLOW, rHIGH) + STORE_RETURN_BOUNDS (rLOW, rHIGH) + + or rTMP, rSRC, rDEST + clrlwi. rTMP, rTMP, 30 + addi rDEST, rDEST, -4 + bne L(unaligned) + + lis rFEFE, -0x101 + lis r7F7F, 0x7f7f + lwz rWORD, 0(rSRC) + addi rFEFE, rFEFE, -0x101 + addi r7F7F, r7F7F, 0x7f7f + b L(g2) + +L(g0): lwzu rALT, 4(rSRC) + stwu rWORD, 4(rDEST) + add rTMP, rFEFE, rALT + nor rNEG, r7F7F, rALT + and. rTMP, rTMP, rNEG + bne- L(g1) + lwzu rWORD, 4(rSRC) + stwu rALT, 4(rDEST) +L(g2): add rTMP, rFEFE, rWORD + nor rNEG, r7F7F, rWORD + and. rTMP, rTMP, rNEG + beq+ L(g0) + + 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 + stbu rTMP, 4(rDEST) + beqlr- + rlwinm. rTMP, rALT, 16, 24, 31 + stbu rTMP, 1(rDEST) + beqlr- + rlwinm. rTMP, rALT, 24, 24, 31 + stbu rTMP, 1(rDEST) + beqlr- + stbu rALT, 1(rDEST) + CHECK_BOUNDS_HIGH (rDEST, rHIGH, twlgt) + STORE_RETURN_VALUE (rDEST) + blr + +/* Oh well. In this case, we just do a byte-by-byte copy. */ + .align 4 + nop +L(unaligned): + lbz rWORD, 0(rSRC) + addi rDEST, rDEST, 3 + cmpwi rWORD, 0 + beq- L(u2) + +L(u0): lbzu rALT, 1(rSRC) + stbu rWORD, 1(rDEST) + cmpwi rALT, 0 + beq- L(u1) + nop /* Let 601 load start of loop. */ + lbzu rWORD, 1(rSRC) + stbu rALT, 1(rDEST) + cmpwi rWORD, 0 + bne+ L(u0) +L(u2): stbu rWORD, 1(rDEST) + CHECK_BOUNDS_HIGH (rDEST, rHIGH, twlgt) + STORE_RETURN_VALUE (rDEST) + blr +L(u1): stbu rALT, 1(rDEST) + CHECK_BOUNDS_HIGH (rDEST, rHIGH, twlgt) + STORE_RETURN_VALUE (rDEST) + blr +END (BP_SYM (__stpcpy)) + +weak_alias (BP_SYM (__stpcpy), BP_SYM (stpcpy)) +libc_hidden_def (__stpcpy) |