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1.1 maekawa 1: /* Pentium __mpn_sub_n -- Subtract two limb vectors of the same length > 0
2: and store difference in a third limb vector.
3:
4: Copyright (C) 1992, 1994, 1995, 1996 Free Software Foundation, Inc.
5:
6: This file is part of the GNU MP Library.
7:
8: The GNU MP Library is free software; you can redistribute it and/or modify
9: it under the terms of the GNU Library General Public License as published by
10: the Free Software Foundation; either version 2 of the License, or (at your
11: option) any later version.
12:
13: The GNU MP Library is distributed in the hope that it will be useful, but
14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
16: License for more details.
17:
18: You should have received a copy of the GNU Library General Public License
19: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21: MA 02111-1307, USA. */
22:
23: /*
24: INPUT PARAMETERS
25: res_ptr (sp + 4)
26: s1_ptr (sp + 8)
27: s2_ptr (sp + 12)
28: size (sp + 16)
29: */
30:
31: #include "sysdep.h"
32: #include "asm-syntax.h"
33:
34: .text
35: ALIGN (3)
36: .globl C_SYMBOL_NAME(__mpn_sub_n)
37: C_SYMBOL_NAME(__mpn_sub_n:)
38: pushl %edi
39: pushl %esi
40: pushl %ebx
41: pushl %ebp
42:
43: movl 20(%esp),%edi /* res_ptr */
44: movl 24(%esp),%esi /* s1_ptr */
45: movl 28(%esp),%ebp /* s2_ptr */
46: movl 32(%esp),%ecx /* size */
47:
48: movl (%ebp),%ebx
49:
50: decl %ecx
51: movl %ecx,%edx
52: shrl $3,%ecx
53: andl $7,%edx
54: testl %ecx,%ecx /* zero carry flag */
55: jz Lend
56: pushl %edx
57:
58: ALIGN (3)
59: Loop: movl 28(%edi),%eax /* fetch destination cache line */
60: leal 32(%edi),%edi
61:
62: L1: movl (%esi),%eax
63: movl 4(%esi),%edx
64: sbbl %ebx,%eax
65: movl 4(%ebp),%ebx
66: sbbl %ebx,%edx
67: movl 8(%ebp),%ebx
68: movl %eax,-32(%edi)
69: movl %edx,-28(%edi)
70:
71: L2: movl 8(%esi),%eax
72: movl 12(%esi),%edx
73: sbbl %ebx,%eax
74: movl 12(%ebp),%ebx
75: sbbl %ebx,%edx
76: movl 16(%ebp),%ebx
77: movl %eax,-24(%edi)
78: movl %edx,-20(%edi)
79:
80: L3: movl 16(%esi),%eax
81: movl 20(%esi),%edx
82: sbbl %ebx,%eax
83: movl 20(%ebp),%ebx
84: sbbl %ebx,%edx
85: movl 24(%ebp),%ebx
86: movl %eax,-16(%edi)
87: movl %edx,-12(%edi)
88:
89: L4: movl 24(%esi),%eax
90: movl 28(%esi),%edx
91: sbbl %ebx,%eax
92: movl 28(%ebp),%ebx
93: sbbl %ebx,%edx
94: movl 32(%ebp),%ebx
95: movl %eax,-8(%edi)
96: movl %edx,-4(%edi)
97:
98: leal 32(%esi),%esi
99: leal 32(%ebp),%ebp
100: decl %ecx
101: jnz Loop
102:
103: popl %edx
104: Lend:
105: decl %edx /* test %edx w/o clobbering carry */
106: js Lend2
107: incl %edx
108: Loop2:
109: leal 4(%edi),%edi
110: movl (%esi),%eax
111: sbbl %ebx,%eax
112: movl 4(%ebp),%ebx
113: movl %eax,-4(%edi)
114: leal 4(%esi),%esi
115: leal 4(%ebp),%ebp
116: decl %edx
117: jnz Loop2
118: Lend2:
119: movl (%esi),%eax
120: sbbl %ebx,%eax
121: movl %eax,(%edi)
122:
123: sbbl %eax,%eax
124: negl %eax
125:
126: popl %ebp
127: popl %ebx
128: popl %esi
129: popl %edi
130: ret