1/* i80386 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
2 the result from a second limb vector.
3 Copyright (C) 1992-2022 Free Software Foundation, Inc.
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
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
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
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
14 License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with the GNU MP Library; see the file COPYING.LIB. If not,
18 see <https://www.gnu.org/licenses/>. */
19
20#include "sysdep.h"
21#include "asm-syntax.h"
22
23#define PARMS 4+16 /* space for 4 saved regs */
24#define RES PARMS
25#define S1 RES+4
26#define SIZE S1+4
27#define S2LIMB SIZE+4
28
29#define res_ptr edi
30#define s1_ptr esi
31#define sizeP ecx
32#define s2_limb ebx
33
34 .text
35ENTRY (__mpn_submul_1)
36
37 pushl %edi
38 cfi_adjust_cfa_offset (4)
39 pushl %esi
40 cfi_adjust_cfa_offset (4)
41 pushl %ebp
42 cfi_adjust_cfa_offset (4)
43 pushl %ebx
44 cfi_adjust_cfa_offset (4)
45 cfi_rel_offset (edi, 12)
46 cfi_rel_offset (esi, 8)
47 cfi_rel_offset (ebp, 4)
48 cfi_rel_offset (ebx, 0)
49
50 movl RES(%esp), %res_ptr
51 movl S1(%esp), %s1_ptr
52 movl SIZE(%esp), %sizeP
53 movl S2LIMB(%esp), %s2_limb
54 leal (%res_ptr,%sizeP,4), %res_ptr
55 leal (%s1_ptr,%sizeP,4), %s1_ptr
56 negl %sizeP
57 xorl %ebp, %ebp
58 ALIGN (3)
59L(oop):
60 movl (%s1_ptr,%sizeP,4), %eax
61 mull %s2_limb
62 addl %ebp, %eax
63 adcl $0, %edx
64 subl %eax, (%res_ptr,%sizeP,4)
65 adcl $0, %edx
66 movl %edx, %ebp
67
68 incl %sizeP
69 jnz L(oop)
70 movl %ebp, %eax
71
72 popl %ebx
73 cfi_adjust_cfa_offset (-4)
74 cfi_restore (ebx)
75 popl %ebp
76 cfi_adjust_cfa_offset (-4)
77 cfi_restore (ebp)
78 popl %esi
79 cfi_adjust_cfa_offset (-4)
80 cfi_restore (esi)
81 popl %edi
82 cfi_adjust_cfa_offset (-4)
83 cfi_restore (edi)
84
85 ret
86END (__mpn_submul_1)
87

source code of glibc/sysdeps/i386/submul_1.S