1dnl PowerPC-32 mpn_addmul_1 -- Multiply a limb vector with a limb and add the 2dnl result to a second limb vector. 3 4dnl Copyright 1995, 1997, 1998, 2000, 2001, 2002, 2003, 2005 Free Software 5dnl Foundation, Inc. 6 7dnl This file is part of the GNU MP Library. 8 9dnl The GNU MP Library is free software; you can redistribute it and/or modify 10dnl it under the terms of the GNU Lesser General Public License as published 11dnl by the Free Software Foundation; either version 3 of the License, or (at 12dnl your option) any later version. 13 14dnl The GNU MP Library is distributed in the hope that it will be useful, but 15dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 17dnl License for more details. 18 19dnl You should have received a copy of the GNU Lesser General Public License 20dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. 21 22include(`../config.m4') 23 24C cycles/limb 25C 603e: ? 26C 604e: 6.75 27C 75x (G3): 8.7-14.3 28C 7400,7410 (G4): 8.7-14.3 29C 744x,745x (G4+): 9.5 30C power4/ppc970: 6.25 31C power5: 6.25 32 33C INPUT PARAMETERS 34C rp r3 35C up r4 36C n r5 37C vl r6 38 39C This is optimized for the PPC604. It has not been tuned for other 40C PowerPC processors. 41C 42C Loop Analysis for the 604: 43C 12 mem insn 44C 8 serializing insn 45C 8 int multiply 46C 25 int reg write 47C 9 int ops (8 of which serialize) 48C 49C The multiply insns need 16 cycles/4limb. 50C The integer register writes will need 13 cycles/4limb. 51C All-in-all, it should be possible to get to 4 or 5 cycles/limb on PPC604, 52C but that will require some clever FPNOPS and BNOPS for exact 53C issue control. 54 55 56ASM_START() 57PROLOGUE(mpn_addmul_1) 58 cmpwi cr0,r5,9 C more than 9 limbs? 59 bgt cr0,L(big) C branch if more than 9 limbs 60 61 mtctr r5 62 lwz r0,0(r4) 63 mullw r7,r0,r6 64 mulhwu r10,r0,r6 65 lwz r9,0(r3) 66 addc r8,r7,r9 67 addi r3,r3,-4 68 bdz L(end) 69L(loop): 70 lwzu r0,4(r4) 71 stwu r8,4(r3) 72 mullw r8,r0,r6 73 adde r7,r8,r10 74 mulhwu r10,r0,r6 75 lwz r9,4(r3) 76 addze r10,r10 77 addc r8,r7,r9 78 bdnz L(loop) 79L(end): stw r8,4(r3) 80 addze r3,r10 81 blr 82 83L(big): stmw r30,-32(r1) 84 addi r5,r5,-1 85 srwi r0,r5,2 86 mtctr r0 87 88 lwz r7,0(r4) 89 mullw r8,r7,r6 90 mulhwu r0,r7,r6 91 lwz r7,0(r3) 92 addc r8,r8,r7 93 stw r8,0(r3) 94 95L(loopU): 96 lwz r7,4(r4) 97 lwz r12,8(r4) 98 lwz r30,12(r4) 99 lwzu r31,16(r4) 100 mullw r8,r7,r6 101 mullw r9,r12,r6 102 mullw r10,r30,r6 103 mullw r11,r31,r6 104 adde r8,r8,r0 C add cy_limb 105 mulhwu r0,r7,r6 106 lwz r7,4(r3) 107 adde r9,r9,r0 108 mulhwu r0,r12,r6 109 lwz r12,8(r3) 110 adde r10,r10,r0 111 mulhwu r0,r30,r6 112 lwz r30,12(r3) 113 adde r11,r11,r0 114 mulhwu r0,r31,r6 115 lwz r31,16(r3) 116 addze r0,r0 C new cy_limb 117 addc r8,r8,r7 118 stw r8,4(r3) 119 adde r9,r9,r12 120 stw r9,8(r3) 121 adde r10,r10,r30 122 stw r10,12(r3) 123 adde r11,r11,r31 124 stwu r11,16(r3) 125 bdnz L(loopU) 126 127 andi. r31,r5,3 128 mtctr r31 129 beq cr0,L(endx) 130 131L(loopE): 132 lwzu r7,4(r4) 133 mullw r8,r7,r6 134 adde r8,r8,r0 C add cy_limb 135 mulhwu r0,r7,r6 136 lwz r7,4(r3) 137 addze r0,r0 C new cy_limb 138 addc r8,r8,r7 139 stwu r8,4(r3) 140 bdnz L(loopE) 141L(endx): 142 addze r3,r0 143 lmw r30,-32(r1) 144 blr 145EPILOGUE(mpn_addmul_1) 146