1dnl ARM mpn_copyd. 2 3dnl Copyright 2003 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 This runs at 3 cycles/limb in the StrongARM. 23 24define(`rp',`r0') 25define(`up',`r1') 26define(`n',`r2') 27 28 29ASM_START() 30PROLOGUE(mpn_copyd) 31 mov r12, n, lsl #2 32 sub r12, r12, #4 33 add rp, rp, r12 C make rp point at last limb 34 add up, up, r12 C make up point at last limb 35 36 tst n, #1 37 beq L(skip1) 38 ldr r3, [up], #-4 39 str r3, [rp], #-4 40L(skip1): 41 tst n, #2 42 beq L(skip2) 43 ldmda up!, { r3, r12 } C load 2 limbs 44 stmda rp!, { r3, r12 } C store 2 limbs 45L(skip2): 46 bics n, n, #3 47 beq L(return) 48 stmfd sp!, { r7, r8, r9 } C save regs on stack 49L(loop): 50 ldmda up!, { r3, r8, r9, r12 } C load 4 limbs 51 ldr r7, [rp, #-12] C cache allocate 52 subs n, n, #4 53 stmda rp!, { r3, r8, r9, r12 } C store 4 limbs 54 bne L(loop) 55 ldmfd sp!, { r7, r8, r9 } C restore regs from stack 56L(return): 57 mov pc, lr 58EPILOGUE(mpn_copyd) 59