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1/* Add two limb vectors of the same length > 0 and store sum in a third
2 limb vector.
581c785b 3 Copyright (C) 1992-2022 Free Software Foundation, Inc.
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4 This file is part of the GNU MP Library.
5
6 The GNU MP Library is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or (at your
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9 option) any later version.
10
11 The GNU MP Library is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
6d84f89a 13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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14 License for more details.
15
6d84f89a 16 You should have received a copy of the GNU Lesser General Public License
59ba27a6 17 along with the GNU MP Library; see the file COPYING.LIB. If not,
5a82c748 18 see <https://www.gnu.org/licenses/>. */
1d2fc9b3 19
be9ccd27 20#include <sysdep.h>
1d2fc9b3 21#include "asm-syntax.h"
3f02f778 22
2366713d 23#define PARMS 4+8 /* space for 2 saved regs */
3f02f778 24#define RES PARMS
2366713d
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25#define S1 RES+4
26#define S2 S1+4
27#define SIZE S2+4
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28
29 .text
30#ifdef PIC
31L(1): addl (%esp), %eax
32 ret
33#endif
2366713d 34ENTRY (__mpn_add_n)
3f02f778 35
1d2fc9b3 36 pushl %edi
1ad9da69 37 cfi_adjust_cfa_offset (4)
1d2fc9b3 38 pushl %esi
1ad9da69 39 cfi_adjust_cfa_offset (4)
1d2fc9b3 40
3f02f778 41 movl RES(%esp),%edi
1ad9da69 42 cfi_rel_offset (edi, 4)
3f02f778 43 movl S1(%esp),%esi
1ad9da69 44 cfi_rel_offset (esi, 0)
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45 movl S2(%esp),%edx
46 movl SIZE(%esp),%ecx
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47
48#if IBT_ENABLED
49 pushl %ebx
50 cfi_adjust_cfa_offset (4)
51 cfi_rel_offset (ebx, 0)
52#endif
53
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54 movl %ecx,%eax
55 shrl $3,%ecx /* compute count for unrolled loop */
56 negl %eax
57 andl $7,%eax /* get index where to start loop */
58 jz L(oop) /* necessary special case for 0 */
59 incl %ecx /* adjust loop count */
60 shll $2,%eax /* adjustment for pointers... */
61 subl %eax,%edi /* ... since they are offset ... */
62 subl %eax,%esi /* ... by a constant when we ... */
63 subl %eax,%edx /* ... enter the loop */
64 shrl $2,%eax /* restore previous value */
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65#if IBT_ENABLED
66 leal -4(,%eax,4),%ebx /* Count for 4-byte endbr32 */
67#endif
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68#ifdef PIC
69/* Calculate start address in loop for PIC. */
70 leal (L(oop)-L(0)-3)(%eax,%eax,8),%eax
71 call L(1)
72L(0):
73#else
74/* Calculate start address in loop for non-PIC. */
75 leal (L(oop) - 3)(%eax,%eax,8),%eax
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76#endif
77#if IBT_ENABLED
78 addl %ebx,%eax /* Adjust for endbr32 */
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79#endif
80 jmp *%eax /* jump into loop */
81 ALIGN (3)
82L(oop): movl (%esi),%eax
83 adcl (%edx),%eax
84 movl %eax,(%edi)
be9ccd27 85 _CET_ENDBR
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86 movl 4(%esi),%eax
87 adcl 4(%edx),%eax
88 movl %eax,4(%edi)
be9ccd27 89 _CET_ENDBR
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90 movl 8(%esi),%eax
91 adcl 8(%edx),%eax
92 movl %eax,8(%edi)
be9ccd27 93 _CET_ENDBR
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94 movl 12(%esi),%eax
95 adcl 12(%edx),%eax
96 movl %eax,12(%edi)
be9ccd27 97 _CET_ENDBR
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98 movl 16(%esi),%eax
99 adcl 16(%edx),%eax
100 movl %eax,16(%edi)
be9ccd27 101 _CET_ENDBR
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102 movl 20(%esi),%eax
103 adcl 20(%edx),%eax
104 movl %eax,20(%edi)
be9ccd27 105 _CET_ENDBR
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106 movl 24(%esi),%eax
107 adcl 24(%edx),%eax
108 movl %eax,24(%edi)
be9ccd27 109 _CET_ENDBR
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110 movl 28(%esi),%eax
111 adcl 28(%edx),%eax
112 movl %eax,28(%edi)
113 leal 32(%edi),%edi
114 leal 32(%esi),%esi
115 leal 32(%edx),%edx
116 decl %ecx
117 jnz L(oop)
118
119 sbbl %eax,%eax
120 negl %eax
121
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122#if IBT_ENABLED
123 popl %ebx
124 cfi_adjust_cfa_offset (-4)
125 cfi_restore (ebx)
126#endif
1d2fc9b3 127 popl %esi
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128 cfi_adjust_cfa_offset (-4)
129 cfi_restore (esi)
1d2fc9b3 130 popl %edi
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131 cfi_adjust_cfa_offset (-4)
132 cfi_restore (edi)
3f02f778 133
1d2fc9b3 134 ret
2366713d 135END (__mpn_add_n)