1dnl ARM mpn_bdiv_dbm1c. 2 3dnl Copyright 2008, 2011, 2012 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 StrongARM ? 24C XScale ? 25C Cortex-A8 ? 26C Cortex-A9 4.25 27C Cortex-A15 2.5 28 29C TODO 30C * Try using umlal or umaal. 31C * Try using ldm/stm. 32 33define(`qp', `r0') 34define(`up', `r1') 35define(`n', `r2') 36define(`bd', `r3') 37define(`cy', `sp,#0') 38 39ASM_START() 40 TEXT 41 ALIGN(16) 42PROLOGUE(mpn_bdiv_dbm1c) 43 push {r4, r5, r6, r7, r8} 44 ldr r4, [up], #4 45 ldr r5, [sp, #20] 46 ands r12, n, #3 47 beq L(fi0) 48 cmp r12, #2 49 bcc L(fi1) 50 beq L(fi2) 51 52L(fi3): umull r8, r12, r4, bd 53 ldr r4, [up], #4 54 b L(lo3) 55 56L(fi0): umull r6, r7, r4, bd 57 ldr r4, [up], #4 58 b L(lo0) 59 60L(fi1): subs n, n, #1 61 umull r8, r12, r4, bd 62 bls L(wd1) 63 ldr r4, [up], #4 64 b L(lo1) 65 66L(fi2): umull r6, r7, r4, bd 67 ldr r4, [up], #4 68 b L(lo2) 69 70L(top): ldr r4, [up], #4 71 subs r5, r5, r6 72 str r5, [qp], #4 73 sbc r5, r5, r7 74L(lo1): umull r6, r7, r4, bd 75 ldr r4, [up], #4 76 subs r5, r5, r8 77 str r5, [qp], #4 78 sbc r5, r5, r12 79L(lo0): umull r8, r12, r4, bd 80 ldr r4, [up], #4 81 subs r5, r5, r6 82 str r5, [qp], #4 83 sbc r5, r5, r7 84L(lo3): umull r6, r7, r4, bd 85 ldr r4, [up], #4 86 subs r5, r5, r8 87 str r5, [qp], #4 88 sbc r5, r5, r12 89L(lo2): subs n, n, #4 90 umull r8, r12, r4, bd 91 bhi L(top) 92 93L(wd2): subs r5, r5, r6 94 str r5, [qp], #4 95 sbc r5, r5, r7 96L(wd1): subs r5, r5, r8 97 str r5, [qp] 98 sbc r0, r5, r12 99 pop {r4, r5, r6, r7, r8} 100ifdef(`ARM_THUMB_MODE', 101` bx lr 102',` mov pc, lr 103') 104EPILOGUE() 105