dnl ARM mpn_rshift. dnl Contributed to the GNU project by Torbjörn Granlund. dnl Copyright 1997, 2000, 2001, 2012 Free Software Foundation, Inc. dnl This file is part of the GNU MP Library. dnl dnl The GNU MP Library is free software; you can redistribute it and/or modify dnl it under the terms of either: dnl dnl * the GNU Lesser General Public License as published by the Free dnl Software Foundation; either version 3 of the License, or (at your dnl option) any later version. dnl dnl or dnl dnl * the GNU General Public License as published by the Free Software dnl Foundation; either version 2 of the License, or (at your option) any dnl later version. dnl dnl or both in parallel, as here. dnl dnl The GNU MP Library is distributed in the hope that it will be useful, but dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License dnl for more details. dnl dnl You should have received copies of the GNU General Public License and the dnl GNU Lesser General Public License along with the GNU MP Library. If not, dnl see https://www.gnu.org/licenses/. include(`../config.m4') C cycles/limb C StrongARM ? C XScale ? C Cortex-A7 ? C Cortex-A8 ? C Cortex-A9 3.5 C Cortex-A15 ? define(`rp', `r0') define(`up', `r1') define(`n', `r2') define(`cnt', `r3') define(`tnc', `r12') ASM_START() PROLOGUE(mpn_rshift) push {r4, r6, r7, r8} ldr r4, [up] rsb tnc, cnt, #32 mov r7, r4, lsr cnt tst n, #1 beq L(evn) C n even L(odd): subs n, n, #2 bcc L(1) C n = 1 ldr r8, [up, #4]! b L(mid) L(evn): ldr r6, [up, #4]! subs n, n, #2 beq L(end) L(top): ldr r8, [up, #4]! orr r7, r7, r6, lsl tnc str r7, [rp], #4 mov r7, r6, lsr cnt L(mid): ldr r6, [up, #4]! orr r7, r7, r8, lsl tnc str r7, [rp], #4 mov r7, r8, lsr cnt subs n, n, #2 bgt L(top) L(end): orr r7, r7, r6, lsl tnc str r7, [rp], #4 mov r7, r6, lsr cnt L(1): str r7, [rp] mov r0, r4, lsl tnc pop {r4, r6, r7, r8} ret r14 EPILOGUE() |