projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 9a0a462c | 1 | /* Add two limb vectors of equal, non-zero length for PowerPC. |
| 4e141d64 | 2 | Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc. |
| 9a0a462c 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 | |
| 6 | modify it under the terms of the GNU Library General Public License as | |
| 7 | published by the Free Software Foundation; either version 2 of the | |
| 8 | License, or (at your option) any later version. | |
| 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 | |
| 13 | Library General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Library General Public | |
| 16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 18 | Boston, MA 02111-1307, USA. */ | |
| 19 | ||
| 20 | #include <sysdep.h> | |
| fa87f403 GM |
21 | #include <bp-sym.h> |
| 22 | #include <bp-asm.h> | |
| 9a0a462c UD |
23 | |
| 24 | /* mp_limb_t mpn_add_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr, | |
| 25 | mp_size_t size) | |
| 26 | Calculate s1+s2 and put result in res_ptr; return carry, 0 or 1. */ | |
| 27 | ||
| 28 | /* Note on optimisation: This code is optimal for the 601. Almost every other | |
| 29 | possible 2-unrolled inner loop will not be. Also, watch out for the | |
| 30 | alignment... */ | |
| 31 | ||
| fa87f403 GM |
32 | EALIGN (BP_SYM (__mpn_add_n), 3, 0) |
| 33 | ||
| 34 | #if __BOUNDED_POINTERS__ | |
| 35 | slwi r10,r6,2 /* convert limbs to bytes */ | |
| 36 | CHECK_BOUNDS_BOTH_WIDE (r3, r8, r9, r10) | |
| 37 | CHECK_BOUNDS_BOTH_WIDE (r4, r8, r9, r10) | |
| 38 | CHECK_BOUNDS_BOTH_WIDE (r5, r8, r9, r10) | |
| 39 | #endif | |
| 9a0a462c | 40 | /* Set up for loop below. */ |
| 217eb19b UD |
41 | mtcrf 0x01,r6 |
| 42 | srwi. r7,r6,1 | |
| 43 | li r10,0 | |
| 44 | mtctr r7 | |
| 4e141d64 | 45 | bt 31,L(2) |
| 9a0a462c UD |
46 | |
| 47 | /* Clear the carry. */ | |
| 217eb19b | 48 | addic r0,r0,0 |
| 9a0a462c | 49 | /* Adjust pointers for loop. */ |
| 217eb19b UD |
50 | addi r3,r3,-4 |
| 51 | addi r4,r4,-4 | |
| 52 | addi r5,r5,-4 | |
| 4e141d64 | 53 | b L(0) |
| 9a0a462c | 54 | |
| 4e141d64 | 55 | L(2): lwz r7,0(r5) |
| 217eb19b UD |
56 | lwz r6,0(r4) |
| 57 | addc r6,r6,r7 | |
| 58 | stw r6,0(r3) | |
| 4e141d64 | 59 | beq L(1) |
| 9a0a462c UD |
60 | |
| 61 | /* The loop. */ | |
| 62 | ||
| 63 | /* Align start of loop to an odd word boundary to guarantee that the | |
| 64 | last two words can be fetched in one access (for 601). */ | |
| 4e141d64 | 65 | L(0): lwz r9,4(r4) |
| 217eb19b UD |
66 | lwz r8,4(r5) |
| 67 | lwzu r6,8(r4) | |
| 68 | lwzu r7,8(r5) | |
| 69 | adde r8,r9,r8 | |
| 70 | stw r8,4(r3) | |
| 71 | adde r6,r6,r7 | |
| 72 | stwu r6,8(r3) | |
| 4e141d64 | 73 | bdnz L(0) |
| 9a0a462c | 74 | /* Return the carry. */ |
| 4e141d64 | 75 | L(1): addze r3,r10 |
| 9a0a462c | 76 | blr |
| fa87f403 | 77 | END (BP_SYM (__mpn_add_n)) |