| Austin Schuh | dace2a6 | 2020-08-18 10:56:48 -0700 | [diff] [blame] | 1 | dnl SPARC mpn_rshift -- Shift a number right. |
| 2 | |
| 3 | dnl Copyright 1995, 1996, 2000 Free Software Foundation, Inc. |
| 4 | |
| 5 | dnl This file is part of the GNU MP Library. |
| 6 | dnl |
| 7 | dnl The GNU MP Library is free software; you can redistribute it and/or modify |
| 8 | dnl it under the terms of either: |
| 9 | dnl |
| 10 | dnl * the GNU Lesser General Public License as published by the Free |
| 11 | dnl Software Foundation; either version 3 of the License, or (at your |
| 12 | dnl option) any later version. |
| 13 | dnl |
| 14 | dnl or |
| 15 | dnl |
| 16 | dnl * the GNU General Public License as published by the Free Software |
| 17 | dnl Foundation; either version 2 of the License, or (at your option) any |
| 18 | dnl later version. |
| 19 | dnl |
| 20 | dnl or both in parallel, as here. |
| 21 | dnl |
| 22 | dnl The GNU MP Library is distributed in the hope that it will be useful, but |
| 23 | dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 24 | dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 25 | dnl for more details. |
| 26 | dnl |
| 27 | dnl You should have received copies of the GNU General Public License and the |
| 28 | dnl GNU Lesser General Public License along with the GNU MP Library. If not, |
| 29 | dnl see https://www.gnu.org/licenses/. |
| 30 | |
| 31 | |
| 32 | include(`../config.m4') |
| 33 | |
| 34 | C INPUT PARAMETERS |
| 35 | C res_ptr %o0 |
| 36 | C src_ptr %o1 |
| 37 | C size %o2 |
| 38 | C cnt %o3 |
| 39 | |
| 40 | ASM_START() |
| 41 | PROLOGUE(mpn_rshift) |
| 42 | ld [%o1],%g2 C load first limb |
| 43 | sub %g0,%o3,%o5 C negate shift count |
| 44 | add %o2,-1,%o2 |
| 45 | andcc %o2,4-1,%g4 C number of limbs in first loop |
| 46 | sll %g2,%o5,%g1 C compute function result |
| 47 | be L(0) C if multiple of 4 limbs, skip first loop |
| 48 | st %g1,[%sp+80] |
| 49 | |
| 50 | sub %o2,%g4,%o2 C adjust count for main loop |
| 51 | |
| 52 | L(loop0): |
| 53 | ld [%o1+4],%g3 |
| 54 | add %o0,4,%o0 |
| 55 | add %o1,4,%o1 |
| 56 | addcc %g4,-1,%g4 |
| 57 | srl %g2,%o3,%o4 |
| 58 | sll %g3,%o5,%g1 |
| 59 | mov %g3,%g2 |
| 60 | or %o4,%g1,%o4 |
| 61 | bne L(loop0) |
| 62 | st %o4,[%o0-4] |
| 63 | |
| 64 | L(0): tst %o2 |
| 65 | be L(end) |
| 66 | nop |
| 67 | |
| 68 | L(loop): |
| 69 | ld [%o1+4],%g3 |
| 70 | add %o0,16,%o0 |
| 71 | addcc %o2,-4,%o2 |
| 72 | srl %g2,%o3,%o4 |
| 73 | sll %g3,%o5,%g1 |
| 74 | |
| 75 | ld [%o1+8],%g2 |
| 76 | srl %g3,%o3,%g4 |
| 77 | or %o4,%g1,%o4 |
| 78 | st %o4,[%o0-16] |
| 79 | sll %g2,%o5,%g1 |
| 80 | |
| 81 | ld [%o1+12],%g3 |
| 82 | srl %g2,%o3,%o4 |
| 83 | or %g4,%g1,%g4 |
| 84 | st %g4,[%o0-12] |
| 85 | sll %g3,%o5,%g1 |
| 86 | |
| 87 | ld [%o1+16],%g2 |
| 88 | srl %g3,%o3,%g4 |
| 89 | or %o4,%g1,%o4 |
| 90 | st %o4,[%o0-8] |
| 91 | sll %g2,%o5,%g1 |
| 92 | |
| 93 | add %o1,16,%o1 |
| 94 | or %g4,%g1,%g4 |
| 95 | bne L(loop) |
| 96 | st %g4,[%o0-4] |
| 97 | |
| 98 | L(end): srl %g2,%o3,%g2 |
| 99 | st %g2,[%o0-0] |
| 100 | retl |
| 101 | ld [%sp+80],%o0 |
| 102 | EPILOGUE(mpn_rshift) |