projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 650425ce | 1 | /* Optimized strcpy implementation for PowerPC. |
| f7a9f785 | 2 | Copyright (C) 1997-2016 Free Software Foundation, Inc. |
| 650425ce UD |
3 | This file is part of the GNU C Library. |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 650425ce UD |
9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 13 | Lesser General Public License for more details. |
| 650425ce | 14 | |
| 41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 650425ce UD |
18 | |
| 19 | #include <sysdep.h> | |
| 20 | ||
| 21 | /* See strlen.s for comments on how the end-of-string testing works. */ | |
| 22 | ||
| 650425ce UD |
23 | /* char * [r3] strcpy (char *dest [r3], const char *src [r4]) */ |
| 24 | ||
| b5510883 | 25 | EALIGN (strcpy, 4, 0) |
| 650425ce | 26 | |
| 1d280d9f GM |
27 | #define rTMP r0 |
| 28 | #define rRTN r3 /* incoming DEST arg preserved as result */ | |
| b5510883 JM |
29 | #define rSRC r4 /* pointer to previous word in src */ |
| 30 | #define rDEST r5 /* pointer to previous word in dest */ | |
| fa87f403 | 31 | #define rWORD r6 /* current word from src */ |
| 1d280d9f | 32 | #define rFEFE r7 /* constant 0xfefefeff (-0x01010101) */ |
| fa87f403 | 33 | #define r7F7F r8 /* constant 0x7f7f7f7f */ |
| 1d280d9f GM |
34 | #define rNEG r9 /* ~(word in s1 | 0x7f7f7f7f) */ |
| 35 | #define rALT r10 /* alternate word from src */ | |
| 650425ce | 36 | |
| fa87f403 | 37 | |
| 1d280d9f GM |
38 | or rTMP, rSRC, rRTN |
| 39 | clrlwi. rTMP, rTMP, 30 | |
| 40 | addi rDEST, rRTN, -4 | |
| 41 | bne L(unaligned) | |
| 650425ce | 42 | |
| 1d280d9f GM |
43 | lis rFEFE, -0x101 |
| 44 | lis r7F7F, 0x7f7f | |
| 45 | lwz rWORD, 0(rSRC) | |
| 46 | addi rFEFE, rFEFE, -0x101 | |
| 47 | addi r7F7F, r7F7F, 0x7f7f | |
| 48 | b L(g2) | |
| 650425ce | 49 | |
| 1d280d9f GM |
50 | L(g0): lwzu rALT, 4(rSRC) |
| 51 | stwu rWORD, 4(rDEST) | |
| 52 | add rTMP, rFEFE, rALT | |
| 53 | nor rNEG, r7F7F, rALT | |
| 54 | and. rTMP, rTMP, rNEG | |
| 55 | bne- L(g1) | |
| 56 | lwzu rWORD, 4(rSRC) | |
| 57 | stwu rALT, 4(rDEST) | |
| 58 | L(g2): add rTMP, rFEFE, rWORD | |
| 59 | nor rNEG, r7F7F, rWORD | |
| 60 | and. rTMP, rTMP, rNEG | |
| 61 | beq+ L(g0) | |
| 62 | ||
| 63 | mr rALT, rWORD | |
| 650425ce | 64 | /* We've hit the end of the string. Do the rest byte-by-byte. */ |
| 43b84013 AM |
65 | L(g1): |
| 66 | #ifdef __LITTLE_ENDIAN__ | |
| 67 | rlwinm. rTMP, rALT, 0, 24, 31 | |
| 68 | stb rALT, 4(rDEST) | |
| 69 | beqlr- | |
| 70 | rlwinm. rTMP, rALT, 24, 24, 31 | |
| 71 | stb rTMP, 5(rDEST) | |
| 72 | beqlr- | |
| 73 | rlwinm. rTMP, rALT, 16, 24, 31 | |
| 74 | stb rTMP, 6(rDEST) | |
| 75 | beqlr- | |
| 76 | rlwinm rTMP, rALT, 8, 24, 31 | |
| 77 | stb rTMP, 7(rDEST) | |
| 78 | blr | |
| 79 | #else | |
| 80 | rlwinm. rTMP, rALT, 8, 24, 31 | |
| 1d280d9f | 81 | stb rTMP, 4(rDEST) |
| 650425ce | 82 | beqlr- |
| 1d280d9f GM |
83 | rlwinm. rTMP, rALT, 16, 24, 31 |
| 84 | stb rTMP, 5(rDEST) | |
| 650425ce | 85 | beqlr- |
| 1d280d9f GM |
86 | rlwinm. rTMP, rALT, 24, 24, 31 |
| 87 | stb rTMP, 6(rDEST) | |
| 650425ce | 88 | beqlr- |
| 1d280d9f | 89 | stb rALT, 7(rDEST) |
| 650425ce | 90 | blr |
| 43b84013 | 91 | #endif |
| 650425ce UD |
92 | |
| 93 | /* Oh well. In this case, we just do a byte-by-byte copy. */ | |
| 94 | .align 4 | |
| 95 | nop | |
| 96 | L(unaligned): | |
| 1d280d9f GM |
97 | lbz rWORD, 0(rSRC) |
| 98 | addi rDEST, rRTN, -1 | |
| 99 | cmpwi rWORD, 0 | |
| 100 | beq- L(u2) | |
| 650425ce | 101 | |
| 1d280d9f GM |
102 | L(u0): lbzu rALT, 1(rSRC) |
| 103 | stbu rWORD, 1(rDEST) | |
| 104 | cmpwi rALT, 0 | |
| 105 | beq- L(u1) | |
| 650425ce | 106 | nop /* Let 601 load start of loop. */ |
| 1d280d9f GM |
107 | lbzu rWORD, 1(rSRC) |
| 108 | stbu rALT, 1(rDEST) | |
| 109 | cmpwi rWORD, 0 | |
| 110 | bne+ L(u0) | |
| 111 | L(u2): stb rWORD, 1(rDEST) | |
| 650425ce | 112 | blr |
| 1d280d9f | 113 | L(u1): stb rALT, 1(rDEST) |
| 650425ce UD |
114 | blr |
| 115 | ||
| b5510883 | 116 | END (strcpy) |
| 85dd1003 | 117 | libc_hidden_builtin_def (strcpy) |