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1.1 maekawa 1: dnl SPARC v7 __udiv_qrnnd division support, used from longlong.h.
2: dnl This is for v7 CPUs without a floating-point unit.
3:
4: dnl Copyright (C) 1993, 1994, 1996, 2000 Free Software Foundation, Inc.
5:
6: dnl This file is part of the GNU MP Library.
7:
8: dnl The GNU MP Library is free software; you can redistribute it and/or modify
9: dnl it under the terms of the GNU Lesser General Public License as published
10: dnl by the Free Software Foundation; either version 2.1 of the License, or (at
11: dnl your option) any later version.
12:
13: dnl The GNU MP Library is distributed in the hope that it will be useful, but
14: dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15: dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
16: dnl License for more details.
17:
18: dnl You should have received a copy of the GNU Lesser General Public License
19: dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write to
20: dnl the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21: dnl MA 02111-1307, USA.
22:
23:
24: include(`../config.m4')
25:
26: C INPUT PARAMETERS
27: C rem_ptr o0
28: C n1 o1
29: C n0 o2
30: C d o3
31:
32: ASM_START()
33: PROLOGUE(mpn_udiv_qrnnd)
34: tst %o3
35: bneg L(largedivisor)
36: mov 8,%g1
37:
38: b L(p1)
39: addxcc %o2,%o2,%o2
40:
41: L(plop):
42: bcc L(n1)
43: addxcc %o2,%o2,%o2
44: L(p1): addx %o1,%o1,%o1
45: subcc %o1,%o3,%o4
46: bcc L(n2)
47: addxcc %o2,%o2,%o2
48: L(p2): addx %o1,%o1,%o1
49: subcc %o1,%o3,%o4
50: bcc L(n3)
51: addxcc %o2,%o2,%o2
52: L(p3): addx %o1,%o1,%o1
53: subcc %o1,%o3,%o4
54: bcc L(n4)
55: addxcc %o2,%o2,%o2
56: L(p4): addx %o1,%o1,%o1
57: addcc %g1,-1,%g1
58: bne L(plop)
59: subcc %o1,%o3,%o4
60: bcc L(n5)
61: addxcc %o2,%o2,%o2
62: L(p5): st %o1,[%o0]
63: retl
64: xnor %g0,%o2,%o0
65:
66: L(nlop):
67: bcc L(p1)
68: addxcc %o2,%o2,%o2
69: L(n1): addx %o4,%o4,%o4
70: subcc %o4,%o3,%o1
71: bcc L(p2)
72: addxcc %o2,%o2,%o2
73: L(n2): addx %o4,%o4,%o4
74: subcc %o4,%o3,%o1
75: bcc L(p3)
76: addxcc %o2,%o2,%o2
77: L(n3): addx %o4,%o4,%o4
78: subcc %o4,%o3,%o1
79: bcc L(p4)
80: addxcc %o2,%o2,%o2
81: L(n4): addx %o4,%o4,%o4
82: addcc %g1,-1,%g1
83: bne L(nlop)
84: subcc %o4,%o3,%o1
85: bcc L(p5)
86: addxcc %o2,%o2,%o2
87: L(n5): st %o4,[%o0]
88: retl
89: xnor %g0,%o2,%o0
90:
91: L(largedivisor):
92: and %o2,1,%o5 C %o5 = n0 & 1
93:
94: srl %o2,1,%o2
95: sll %o1,31,%g2
96: or %g2,%o2,%o2 C %o2 = lo(n1n0 >> 1)
97: srl %o1,1,%o1 C %o1 = hi(n1n0 >> 1)
98:
99: and %o3,1,%g2
100: srl %o3,1,%g3 C %g3 = floor(d / 2)
101: add %g3,%g2,%g3 C %g3 = ceil(d / 2)
102:
103: b L(Lp1)
104: addxcc %o2,%o2,%o2
105:
106: L(Lplop):
107: bcc L(Ln1)
108: addxcc %o2,%o2,%o2
109: L(Lp1): addx %o1,%o1,%o1
110: subcc %o1,%g3,%o4
111: bcc L(Ln2)
112: addxcc %o2,%o2,%o2
113: L(Lp2): addx %o1,%o1,%o1
114: subcc %o1,%g3,%o4
115: bcc L(Ln3)
116: addxcc %o2,%o2,%o2
117: L(Lp3): addx %o1,%o1,%o1
118: subcc %o1,%g3,%o4
119: bcc L(Ln4)
120: addxcc %o2,%o2,%o2
121: L(Lp4): addx %o1,%o1,%o1
122: addcc %g1,-1,%g1
123: bne L(Lplop)
124: subcc %o1,%g3,%o4
125: bcc L(Ln5)
126: addxcc %o2,%o2,%o2
127: L(Lp5): add %o1,%o1,%o1 C << 1
128: tst %g2
129: bne L(oddp)
130: add %o5,%o1,%o1
131: st %o1,[%o0]
132: retl
133: xnor %g0,%o2,%o0
134:
135: L(Lnlop):
136: bcc L(Lp1)
137: addxcc %o2,%o2,%o2
138: L(Ln1): addx %o4,%o4,%o4
139: subcc %o4,%g3,%o1
140: bcc L(Lp2)
141: addxcc %o2,%o2,%o2
142: L(Ln2): addx %o4,%o4,%o4
143: subcc %o4,%g3,%o1
144: bcc L(Lp3)
145: addxcc %o2,%o2,%o2
146: L(Ln3): addx %o4,%o4,%o4
147: subcc %o4,%g3,%o1
148: bcc L(Lp4)
149: addxcc %o2,%o2,%o2
150: L(Ln4): addx %o4,%o4,%o4
151: addcc %g1,-1,%g1
152: bne L(Lnlop)
153: subcc %o4,%g3,%o1
154: bcc L(Lp5)
155: addxcc %o2,%o2,%o2
156: L(Ln5): add %o4,%o4,%o4 C << 1
157: tst %g2
158: bne L(oddn)
159: add %o5,%o4,%o4
160: st %o4,[%o0]
161: retl
162: xnor %g0,%o2,%o0
163:
164: L(oddp):
165: xnor %g0,%o2,%o2
166: C q' in %o2. r' in %o1
167: addcc %o1,%o2,%o1
168: bcc L(Lp6)
169: addx %o2,0,%o2
170: sub %o1,%o3,%o1
171: L(Lp6): subcc %o1,%o3,%g0
172: bcs L(Lp7)
173: subx %o2,-1,%o2
174: sub %o1,%o3,%o1
175: L(Lp7): st %o1,[%o0]
176: retl
177: mov %o2,%o0
178:
179: L(oddn):
180: xnor %g0,%o2,%o2
181: C q' in %o2. r' in %o4
182: addcc %o4,%o2,%o4
183: bcc L(Ln6)
184: addx %o2,0,%o2
185: sub %o4,%o3,%o4
186: L(Ln6): subcc %o4,%o3,%g0
187: bcs L(Ln7)
188: subx %o2,-1,%o2
189: sub %o4,%o3,%o4
190: L(Ln7): st %o4,[%o0]
191: retl
192: mov %o2,%o0
193: EPILOGUE(mpn_udiv_qrnnd)