| dnl ARM mpn_rshift. |
| |
| dnl Contributed to the GNU project by Torbjรถrn 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} |
| return r14 |
| EPILOGUE() |