| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* SPARC v9 __mpn_rshift -- |
| 2 | |
| 3 | Copyright (C) 1996-2016 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the GNU MP Library. |
| 6 | |
| 7 | The GNU MP Library is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU Lesser General Public License as published by |
| 9 | the Free Software Foundation; either version 2.1 of the License, or (at your |
| 10 | option) any later version. |
| 11 | |
| 12 | The GNU MP Library is distributed in the hope that it will be useful, but |
| 13 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| 15 | License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU Lesser General Public License |
| 18 | along with the GNU MP Library; see the file COPYING.LIB. If not, |
| 19 | see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include <sysdep.h> |
| 22 | |
| 23 | /* INPUT PARAMETERS |
| 24 | res_ptr %o0 |
| 25 | src_ptr %o1 |
| 26 | size %o2 |
| 27 | cnt %o3 */ |
| 28 | |
| 29 | .register %g2, #scratch |
| 30 | .register %g3, #scratch |
| 31 | |
| 32 | ENTRY(__mpn_rshift) |
| 33 | ldx [%o1],%g2 ! load first limb |
| 34 | sub %g0,%o3,%o5 ! negate shift count |
| 35 | add %o2,-1,%o2 |
| 36 | andcc %o2,4-1,%g4 ! number of limbs in first loop |
| 37 | sllx %g2,%o5,%g1 ! compute function result |
| 38 | be,pn %xcc,.L0 ! if multiple of 4 limbs, skip first loop |
| 39 | mov %g1,%g5 |
| 40 | |
| 41 | sub %o2,%g4,%o2 ! adjust count for main loop |
| 42 | |
| 43 | .Loop0: ldx [%o1+8],%g3 |
| 44 | add %o0,8,%o0 |
| 45 | add %o1,8,%o1 |
| 46 | srlx %g2,%o3,%o4 |
| 47 | addcc %g4,-1,%g4 |
| 48 | sllx %g3,%o5,%g1 |
| 49 | mov %g3,%g2 |
| 50 | or %o4,%g1,%o4 |
| 51 | bne,pt %xcc,.Loop0 |
| 52 | stx %o4,[%o0-8] |
| 53 | |
| 54 | .L0: brz,pn %o2,.Lend |
| 55 | nop |
| 56 | |
| 57 | .Loop: ldx [%o1+8],%g3 |
| 58 | add %o0,32,%o0 |
| 59 | srlx %g2,%o3,%o4 |
| 60 | addcc %o2,-4,%o2 |
| 61 | sllx %g3,%o5,%g1 |
| 62 | |
| 63 | ldx [%o1+16],%g2 |
| 64 | srlx %g3,%o3,%g4 |
| 65 | or %o4,%g1,%o4 |
| 66 | stx %o4,[%o0-32] |
| 67 | sllx %g2,%o5,%g1 |
| 68 | |
| 69 | ldx [%o1+24],%g3 |
| 70 | srlx %g2,%o3,%o4 |
| 71 | or %g4,%g1,%g4 |
| 72 | stx %g4,[%o0-24] |
| 73 | sllx %g3,%o5,%g1 |
| 74 | |
| 75 | ldx [%o1+32],%g2 |
| 76 | srlx %g3,%o3,%g4 |
| 77 | or %o4,%g1,%o4 |
| 78 | stx %o4,[%o0-16] |
| 79 | sllx %g2,%o5,%g1 |
| 80 | |
| 81 | add %o1,32,%o1 |
| 82 | or %g4,%g1,%g4 |
| 83 | bne,pt %xcc,.Loop |
| 84 | stx %g4,[%o0-8] |
| 85 | |
| 86 | .Lend: srlx %g2,%o3,%g2 |
| 87 | stx %g2,[%o0-0] |
| 88 | |
| 89 | jmpl %o7+8,%g0 |
| 90 | mov %g5,%o0 |
| 91 | |
| 92 | END(__mpn_rshift) |