1dnl PowerPC-64 mpn_mod_34lsub1 -- modulo 2^24-1. 2 3dnl Copyright 2005 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of the GNU Lesser General Public License as published 9dnl by the Free Software Foundation; either version 3 of the License, or (at 10dnl your option) any later version. 11 12dnl The GNU MP Library is distributed in the hope that it will be useful, but 13dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 15dnl License for more details. 16 17dnl You should have received a copy of the GNU Lesser General Public License 18dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. 19 20include(`../config.m4') 21 22C cycles/limb 23C POWER3/PPC630: 1.33 24C POWER4/PPC970: 1.5 25C POWER5: 1.57 26 27C INPUT PARAMETERS 28define(`up',`r3') 29define(`n',`r4') 30 31ASM_START() 32PROLOGUE(mpn_mod_34lsub1) 33 li r8, 0 34 li r9, 0 35 li r10, 0 36 li r11, 0 37 38 cmpdi cr6, n, 3 39 blt cr6, L(lt3) 40 41 li r0, -0x5556 C 0xFFFFFFFFFFFFAAAA 42 rldimi r0, r0, 16, 32 C 0xFFFFFFFFAAAAAAAA 43 rldimi r0, r0, 32, 63 C 0xAAAAAAAAAAAAAAAB 44 mulhdu r0, r0, n 45 srdi r0, r0, 1 C r0 = [n / 3] 46 mtctr r0 47 48 ld r5, 0(up) 49 ld r6, 8(up) 50 ld r7, 16(up) 51 addi up, up, 24 52 bdz L(end) 53 54 ALIGN(16) 55L(top): addc r8, r8, r5 56 nop 57 ld r5, 0(up) 58 adde r9, r9, r6 59 ld r6, 8(up) 60 adde r10, r10, r7 61 ld r7, 16(up) 62 addi up, up, 48 63 addze r11, r11 64 bdz L(endx) 65 addc r8, r8, r5 66 nop 67 ld r5, -24(up) 68 adde r9, r9, r6 69 ld r6, -16(up) 70 adde r10, r10, r7 71 ld r7, -8(up) 72 addze r11, r11 73 bdnz L(top) 74 75 addi up, up, 24 76L(endx): 77 addi up, up, -24 78 79L(end): addc r8, r8, r5 80 adde r9, r9, r6 81 adde r10, r10, r7 82 addze r11, r11 83 84 sldi r5, r0, 1 85 add r5, r5, r0 C r11 = n / 3 * 3 86 sub n, n, r5 C n = n mod 3 87L(lt3): cmpdi cr6, n, 1 88 blt cr6, L(2) 89 90 ld r5, 0(up) 91 addc r8, r8, r5 92 li r6, 0 93 beq cr6, L(1) 94 95 ld r6, 8(up) 96L(1): adde r9, r9, r6 97 addze r10, r10 98 addze r11, r11 99 100L(2): rldicl r0, r8, 0, 16 C r0 = r8 mod 2^48 101 srdi r3, r8, 48 C r3 = r8 div 2^48 102 rldic r4, r9, 16, 16 C r4 = (r9 mod 2^32) << 16 103 srdi r5, r9, 32 C r5 = r9 div 2^32 104 rldic r6, r10, 32, 16 C r6 = (r10 mod 2^16) << 32 105 srdi r7, r10, 16 C r7 = r10 div 2^16 106 107 add r0, r0, r3 108 add r4, r4, r5 109 add r6, r6, r7 110 111 add r0, r0, r4 112 add r6, r6, r11 113 114 add r3, r0, r6 115 blr 116EPILOGUE() 117 118C |__r10__|__r9___|__r8___| 119C |-----|-----|-----|-----| 120