projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5929563f | 1 | /* i80386 __mpn_rshift -- |
| d614a753 | 2 | Copyright (C) 1992-2020 Free Software Foundation, Inc. |
| 5929563f | 3 | This file is part of the GNU MP Library. |
| 28f540f4 | 4 | |
| 5929563f | 5 | The GNU MP Library is free software; you can redistribute it and/or modify |
| 6d84f89a AJ |
6 | it under the terms of the GNU Lesser General Public License as published by |
| 7 | the Free Software Foundation; either version 2.1 of the License, or (at your | |
| 5929563f | 8 | option) any later version. |
| 28f540f4 | 9 | |
| 5929563f UD |
10 | The GNU MP Library is distributed in the hope that it will be useful, but |
| 11 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
| 6d84f89a | 12 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| 5929563f | 13 | License for more details. |
| 28f540f4 | 14 | |
| 6d84f89a | 15 | You should have received a copy of the GNU Lesser General Public License |
| 59ba27a6 | 16 | along with the GNU MP Library; see the file COPYING.LIB. If not, |
| 5a82c748 | 17 | see <https://www.gnu.org/licenses/>. */ |
| 28f540f4 | 18 | |
| 28f540f4 RM |
19 | #include "sysdep.h" |
| 20 | #include "asm-syntax.h" | |
| 3f02f778 | 21 | |
| 2366713d | 22 | #define PARMS 4+12 /* space for 3 saved regs */ |
| 3f02f778 | 23 | #define RES PARMS |
| 2366713d JM |
24 | #define S RES+4 |
| 25 | #define SIZE S+4 | |
| 3f02f778 | 26 | #define CNT SIZE+4 |
| 28f540f4 | 27 | |
| ae828bc6 | 28 | .text |
| 2366713d | 29 | ENTRY (__mpn_rshift) |
| 3f02f778 | 30 | |
| 28f540f4 | 31 | pushl %edi |
| 1ad9da69 | 32 | cfi_adjust_cfa_offset (4) |
| 28f540f4 | 33 | pushl %esi |
| 1ad9da69 | 34 | cfi_adjust_cfa_offset (4) |
| 28f540f4 | 35 | pushl %ebx |
| 1ad9da69 | 36 | cfi_adjust_cfa_offset (4) |
| 28f540f4 | 37 | |
| 3f02f778 | 38 | movl RES(%esp),%edi |
| 1ad9da69 | 39 | cfi_rel_offset (edi, 8) |
| 3f02f778 | 40 | movl S(%esp),%esi |
| 1ad9da69 | 41 | cfi_rel_offset (esi, 4) |
| 3f02f778 GM |
42 | movl SIZE(%esp),%edx |
| 43 | movl CNT(%esp),%ecx | |
| 28f540f4 RM |
44 | leal -4(%edi,%edx,4),%edi |
| 45 | leal (%esi,%edx,4),%esi | |
| 46 | negl %edx | |
| 47 | ||
| 48 | movl (%esi,%edx,4),%ebx /* read least significant limb */ | |
| 1ad9da69 | 49 | cfi_rel_offset (ebx, 0) |
| 0ee5660b | 50 | cfi_remember_state |
| 28f540f4 RM |
51 | xorl %eax,%eax |
| 52 | shrdl %cl,%ebx,%eax /* compute carry limb */ | |
| 53 | incl %edx | |
| 5929563f | 54 | jz L(end) |
| 28f540f4 | 55 | pushl %eax /* push carry limb onto stack */ |
| 1ad9da69 | 56 | cfi_adjust_cfa_offset (4) |
| a7123f0e | 57 | testb $1,%dl |
| 5929563f | 58 | jnz L(1) /* enter loop in the middle */ |
| 28f540f4 RM |
59 | movl %ebx,%eax |
| 60 | ||
| 61 | ALIGN (3) | |
| 5929563f | 62 | L(oop): movl (%esi,%edx,4),%ebx /* load next higher limb */ |
| 28f540f4 RM |
63 | shrdl %cl,%ebx,%eax /* compute result limb */ |
| 64 | movl %eax,(%edi,%edx,4) /* store it */ | |
| 65 | incl %edx | |
| 5929563f | 66 | L(1): movl (%esi,%edx,4),%eax |
| 28f540f4 RM |
67 | shrdl %cl,%eax,%ebx |
| 68 | movl %ebx,(%edi,%edx,4) | |
| 69 | incl %edx | |
| 5929563f | 70 | jnz L(oop) |
| 28f540f4 RM |
71 | |
| 72 | shrl %cl,%eax /* compute most significant limb */ | |
| 73 | movl %eax,(%edi) /* store it */ | |
| 74 | ||
| 75 | popl %eax /* pop carry limb */ | |
| 1ad9da69 | 76 | cfi_adjust_cfa_offset (-4) |
| 28f540f4 RM |
77 | |
| 78 | popl %ebx | |
| 1ad9da69 UD |
79 | cfi_adjust_cfa_offset (-4) |
| 80 | cfi_restore (ebx) | |
| 28f540f4 | 81 | popl %esi |
| 1ad9da69 UD |
82 | cfi_adjust_cfa_offset (-4) |
| 83 | cfi_restore (esi) | |
| 28f540f4 | 84 | popl %edi |
| 1ad9da69 UD |
85 | cfi_adjust_cfa_offset (-4) |
| 86 | cfi_restore (edi) | |
| 3f02f778 | 87 | |
| 28f540f4 RM |
88 | ret |
| 89 | ||
| 0ee5660b | 90 | cfi_restore_state |
| 5929563f | 91 | L(end): shrl %cl,%ebx /* compute most significant limb */ |
| 28f540f4 RM |
92 | movl %ebx,(%edi) /* store it */ |
| 93 | ||
| 94 | popl %ebx | |
| 1ad9da69 UD |
95 | cfi_adjust_cfa_offset (-4) |
| 96 | cfi_restore (ebx) | |
| 28f540f4 | 97 | popl %esi |
| 1ad9da69 UD |
98 | cfi_adjust_cfa_offset (-4) |
| 99 | cfi_restore (esi) | |
| 28f540f4 | 100 | popl %edi |
| 1ad9da69 UD |
101 | cfi_adjust_cfa_offset (-4) |
| 102 | cfi_restore (edi) | |
| 3f02f778 | 103 | |
| 28f540f4 | 104 | ret |
| 2366713d | 105 | END (__mpn_rshift) |