1dnl ARM mpn_rshift. 2 3dnl Contributed to the GNU project by Torbjörn Granlund. 4 5dnl Copyright 1997, 2000, 2001, 2012 Free Software Foundation, Inc. 6 7dnl This file is part of the GNU MP Library. 8dnl 9dnl The GNU MP Library is free software; you can redistribute it and/or modify 10dnl it under the terms of either: 11dnl 12dnl * the GNU Lesser General Public License as published by the Free 13dnl Software Foundation; either version 3 of the License, or (at your 14dnl option) any later version. 15dnl 16dnl or 17dnl 18dnl * the GNU General Public License as published by the Free Software 19dnl Foundation; either version 2 of the License, or (at your option) any 20dnl later version. 21dnl 22dnl or both in parallel, as here. 23dnl 24dnl The GNU MP Library is distributed in the hope that it will be useful, but 25dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 26dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 27dnl for more details. 28dnl 29dnl You should have received copies of the GNU General Public License and the 30dnl GNU Lesser General Public License along with the GNU MP Library. If not, 31dnl see https://www.gnu.org/licenses/. 32 33include(`../config.m4') 34 35C cycles/limb 36C StrongARM ? 37C XScale ? 38C Cortex-A7 ? 39C Cortex-A8 ? 40C Cortex-A9 3.5 41C Cortex-A15 ? 42 43define(`rp', `r0') 44define(`up', `r1') 45define(`n', `r2') 46define(`cnt', `r3') 47define(`tnc', `r12') 48 49ASM_START() 50PROLOGUE(mpn_rshift) 51 push {r4, r6, r7, r8} 52 ldr r4, [up] 53 rsb tnc, cnt, #32 54 55 mov r7, r4, lsr cnt 56 tst n, #1 57 beq L(evn) C n even 58 59L(odd): subs n, n, #2 60 bcc L(1) C n = 1 61 ldr r8, [up, #4]! 62 b L(mid) 63 64L(evn): ldr r6, [up, #4]! 65 subs n, n, #2 66 beq L(end) 67 68L(top): ldr r8, [up, #4]! 69 orr r7, r7, r6, lsl tnc 70 str r7, [rp], #4 71 mov r7, r6, lsr cnt 72L(mid): ldr r6, [up, #4]! 73 orr r7, r7, r8, lsl tnc 74 str r7, [rp], #4 75 mov r7, r8, lsr cnt 76 subs n, n, #2 77 bgt L(top) 78 79L(end): orr r7, r7, r6, lsl tnc 80 str r7, [rp], #4 81 mov r7, r6, lsr cnt 82L(1): str r7, [rp] 83 mov r0, r4, lsl tnc 84 pop {r4, r6, r7, r8} 85 return r14 86EPILOGUE() 87