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1/* 32 and 64-bit millicode, original author Hewlett-Packard
2 adapted for gcc by Paul Bame <bame@debian.org>
3 and Alan Modra <alan@linuxcare.com.au>.
4
5 Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
6
7 This file is part of GCC and is released under the terms of
8 of the GNU General Public License as published by the Free Software
9 Foundation; either version 2, or (at your option) any later version.
10 See the file COPYING in the top-level GCC source directory for a copy
11 of the license. */
12
13#include "milli.h"
14
15#ifdef L_remU
16/* ROUTINE: $$remU
17 . Single precision divide for remainder with unsigned binary integers.
18 .
19 . The remainder must be dividend-(dividend/divisor)*divisor.
20 . Divide by zero is trapped.
21
22 INPUT REGISTERS:
23 . arg0 == dividend
24 . arg1 == divisor
25 . mrp == return pc
26 . sr0 == return space when called externally
27
28 OUTPUT REGISTERS:
29 . arg0 = undefined
30 . arg1 = undefined
31 . ret1 = remainder
32
33 OTHER REGISTERS AFFECTED:
34 . r1 = undefined
35
36 SIDE EFFECTS:
37 . Causes a trap under the following conditions: DIVIDE BY ZERO
38 . Changes memory at the following places: NONE
39
40 PERMISSIBLE CONTEXT:
41 . Unwindable.
42 . Does not create a stack frame.
43 . Suitable for internal or external millicode.
44 . Assumes the special millicode register conventions.
45
46 DISCUSSION:
47 . Calls other millicode routines using mrp: NONE
48 . Calls other millicode routines: NONE */
49
50
51RDEFINE(temp,r1)
52RDEFINE(rmndr,ret1) /* r29 */
53 SUBSPA_MILLI
54 ATTR_MILLI
55 .export $$remU,millicode
56 .proc
57 .callinfo millicode
58 .entry
59GSYM($$remU)
60 ldo -1(arg1),temp /* is there at most one bit set ? */
61 and,= arg1,temp,r0 /* if not, don't use power of 2 */
62 b LREF(regular_seq)
63 addit,= 0,arg1,r0 /* trap on div by zero */
64 and arg0,temp,rmndr /* get the result for power of 2 */
65 MILLIRETN
66LSYM(regular_seq)
67 comib,>=,n 0,arg1,LREF(special_case)
68 subi 0,arg1,rmndr /* clear carry, negate the divisor */
69 ds r0,rmndr,r0 /* set V-bit to 1 */
70 add arg0,arg0,temp /* shift msb bit into carry */
71 ds r0,arg1,rmndr /* 1st divide step, if no carry */
72 addc temp,temp,temp /* shift temp with/into carry */
73 ds rmndr,arg1,rmndr /* 2nd divide step */
74 addc temp,temp,temp /* shift temp with/into carry */
75 ds rmndr,arg1,rmndr /* 3rd divide step */
76 addc temp,temp,temp /* shift temp with/into carry */
77 ds rmndr,arg1,rmndr /* 4th divide step */
78 addc temp,temp,temp /* shift temp with/into carry */
79 ds rmndr,arg1,rmndr /* 5th divide step */
80 addc temp,temp,temp /* shift temp with/into carry */
81 ds rmndr,arg1,rmndr /* 6th divide step */
82 addc temp,temp,temp /* shift temp with/into carry */
83 ds rmndr,arg1,rmndr /* 7th divide step */
84 addc temp,temp,temp /* shift temp with/into carry */
85 ds rmndr,arg1,rmndr /* 8th divide step */
86 addc temp,temp,temp /* shift temp with/into carry */
87 ds rmndr,arg1,rmndr /* 9th divide step */
88 addc temp,temp,temp /* shift temp with/into carry */
89 ds rmndr,arg1,rmndr /* 10th divide step */
90 addc temp,temp,temp /* shift temp with/into carry */
91 ds rmndr,arg1,rmndr /* 11th divide step */
92 addc temp,temp,temp /* shift temp with/into carry */
93 ds rmndr,arg1,rmndr /* 12th divide step */
94 addc temp,temp,temp /* shift temp with/into carry */
95 ds rmndr,arg1,rmndr /* 13th divide step */
96 addc temp,temp,temp /* shift temp with/into carry */
97 ds rmndr,arg1,rmndr /* 14th divide step */
98 addc temp,temp,temp /* shift temp with/into carry */
99 ds rmndr,arg1,rmndr /* 15th divide step */
100 addc temp,temp,temp /* shift temp with/into carry */
101 ds rmndr,arg1,rmndr /* 16th divide step */
102 addc temp,temp,temp /* shift temp with/into carry */
103 ds rmndr,arg1,rmndr /* 17th divide step */
104 addc temp,temp,temp /* shift temp with/into carry */
105 ds rmndr,arg1,rmndr /* 18th divide step */
106 addc temp,temp,temp /* shift temp with/into carry */
107 ds rmndr,arg1,rmndr /* 19th divide step */
108 addc temp,temp,temp /* shift temp with/into carry */
109 ds rmndr,arg1,rmndr /* 20th divide step */
110 addc temp,temp,temp /* shift temp with/into carry */
111 ds rmndr,arg1,rmndr /* 21st divide step */
112 addc temp,temp,temp /* shift temp with/into carry */
113 ds rmndr,arg1,rmndr /* 22nd divide step */
114 addc temp,temp,temp /* shift temp with/into carry */
115 ds rmndr,arg1,rmndr /* 23rd divide step */
116 addc temp,temp,temp /* shift temp with/into carry */
117 ds rmndr,arg1,rmndr /* 24th divide step */
118 addc temp,temp,temp /* shift temp with/into carry */
119 ds rmndr,arg1,rmndr /* 25th divide step */
120 addc temp,temp,temp /* shift temp with/into carry */
121 ds rmndr,arg1,rmndr /* 26th divide step */
122 addc temp,temp,temp /* shift temp with/into carry */
123 ds rmndr,arg1,rmndr /* 27th divide step */
124 addc temp,temp,temp /* shift temp with/into carry */
125 ds rmndr,arg1,rmndr /* 28th divide step */
126 addc temp,temp,temp /* shift temp with/into carry */
127 ds rmndr,arg1,rmndr /* 29th divide step */
128 addc temp,temp,temp /* shift temp with/into carry */
129 ds rmndr,arg1,rmndr /* 30th divide step */
130 addc temp,temp,temp /* shift temp with/into carry */
131 ds rmndr,arg1,rmndr /* 31st divide step */
132 addc temp,temp,temp /* shift temp with/into carry */
133 ds rmndr,arg1,rmndr /* 32nd divide step, */
134 comiclr,<= 0,rmndr,r0
135 add rmndr,arg1,rmndr /* correction */
136 MILLIRETN
137 nop
138
139/* Putting >= on the last DS and deleting COMICLR does not work! */
140LSYM(special_case)
141 sub,>>= arg0,arg1,rmndr
142 copy arg0,rmndr
143 MILLIRETN
144 nop
145 .exit
146 .procend
147 .end
148#endif