1dnl PowerPC-64/mode32 mpn_add_n -- Add two limb vectors of the same length > 0 2dnl and store sum in a third limb vector. 3 4dnl Copyright 1999-2001, 2003, 2005 Free Software Foundation, Inc. 5 6dnl This file is part of the GNU MP Library. 7dnl 8dnl The GNU MP Library is free software; you can redistribute it and/or modify 9dnl it under the terms of either: 10dnl 11dnl * the GNU Lesser General Public License as published by the Free 12dnl Software Foundation; either version 3 of the License, or (at your 13dnl option) any later version. 14dnl 15dnl or 16dnl 17dnl * the GNU General Public License as published by the Free Software 18dnl Foundation; either version 2 of the License, or (at your option) any 19dnl later version. 20dnl 21dnl or both in parallel, as here. 22dnl 23dnl The GNU MP Library is distributed in the hope that it will be useful, but 24dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 25dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 26dnl for more details. 27dnl 28dnl You should have received copies of the GNU General Public License and the 29dnl GNU Lesser General Public License along with the GNU MP Library. If not, 30dnl see https://www.gnu.org/licenses/. 31 32include(`../config.m4') 33 34C cycles/limb 35C POWER3/PPC630: ? 36C POWER4/PPC970: 4.25 37 38C INPUT PARAMETERS 39C rp r3 40C up r4 41C vp r5 42C n r6 43 44ASM_START() 45PROLOGUE(mpn_add_n) 46 mtctr r6 C copy size into CTR 47 addic r0, r0, 0 C clear cy 48 ld r8, 0(r4) C load least significant s1 limb 49 ld r0, 0(r5) C load least significant s2 limb 50 addi r3, r3, -8 C offset res_ptr, it's updated before it's used 51 bdz L(end) C If done, skip loop 52 53L(oop): ld r9, 8(r4) C load s1 limb 54 ld r10, 8(r5) C load s2 limb 55 adde r7, r0, r8 C add limbs with cy, set cy 56 srdi r6, r0, 32 57 srdi r11, r8, 32 58 adde r6, r6, r11 C add high limb parts, set cy 59 std r7, 8(r3) C store result limb 60 bdz L(exit) C decrement CTR and exit if done 61 ldu r8, 16(r4) C load s1 limb and update s1_ptr 62 ldu r0, 16(r5) C load s2 limb and update s2_ptr 63 adde r7, r10, r9 C add limbs with cy, set cy 64 srdi r6, r10, 32 65 srdi r11, r9, 32 66 adde r6, r6, r11 C add high limb parts, set cy 67 stdu r7, 16(r3) C store result limb and update res_ptr 68 bdnz L(oop) C decrement CTR and loop back 69 70L(end): adde r7, r0, r8 71 srdi r6, r0, 32 72 srdi r11, r8, 32 73 adde r6, r6, r11 C add limbs with cy, set cy 74 std r7, 8(r3) C store ultimate result limb 75 li r3, 0 C load cy into ... 76 addze r4, r3 C ... return value register 77 blr 78L(exit): adde r7, r10, r9 79 srdi r6, r10, 32 80 srdi r11, r9, 32 81 adde r6, r6, r11 C add limbs with cy, set cy 82 std r7, 16(r3) 83 li r3, 0 C load cy into ... 84 addze r4, r3 C ... return value register 85 blr 86EPILOGUE() 87