projects / thirdparty / glibc.git / blame
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1 | /* SPARC v9 __mpn_rshift -- |
| 2 | ||
| b168057a | 3 | Copyright (C) 1996-2015 Free Software Foundation, Inc. |
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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 | |
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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 | |
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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 | |
| 6d84f89a | 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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15 | License for more details. |
| 16 | ||
| 6d84f89a | 17 | You should have received a copy of the GNU Lesser General Public License |
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18 | along with the GNU MP Library; see the file COPYING.LIB. If not, |
| 19 | see <http://www.gnu.org/licenses/>. */ | |
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20 | |
| 21 | #include <sysdep.h> | |
| 22 | ||
| 23 | /* INPUT PARAMETERS | |
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24 | res_ptr %o0 |
| 25 | src_ptr %o1 | |
| 26 | size %o2 | |
| 27 | cnt %o3 */ | |
| 5ae3e846 | 28 | |
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29 | .register %g2, #scratch |
| 30 | .register %g3, #scratch | |
| 31 | ||
| 5ae3e846 | 32 | ENTRY(__mpn_rshift) |
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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 | |
| 5ae3e846 | 49 | mov %g3,%g2 |
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50 | or %o4,%g1,%o4 |
| 51 | bne,pt %xcc,.Loop0 | |
| 52 | stx %o4,[%o0-8] | |
| 5ae3e846 | 53 | |
| 2e65ca2b | 54 | .L0: brz,pn %o2,.Lend |
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55 | nop |
| 56 | ||
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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 | |
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91 | |
| 92 | END(__mpn_rshift) |