/* Optimized stpcpy implementation for PowerPC64.
- Copyright (C) 1997-2013 Free Software Foundation, Inc.
+ Copyright (C) 1997-2014 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
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <sysdep.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 (__stpcpy, 4, 0)
- CALL_MCOUNT 2
-
-#define rTMP r0
-#define rRTN r3
-#define rDEST r3 /* pointer to previous word in dest */
-#define rSRC r4 /* pointer to previous word in src */
-#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 */
-
- or rTMP, rSRC, rDEST
- clrldi. rTMP, rTMP, 62
- 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)
- 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)
- blr
-L(u1): stbu rALT, 1(rDEST)
- blr
-END (__stpcpy)
+#define USE_AS_STPCPY
+#include <sysdeps/powerpc/powerpc64/strcpy.S>
weak_alias (__stpcpy, stpcpy)
libc_hidden_def (__stpcpy)