Commit | Line | Data |
---|---|---|
7af5ad59 PH |
1 | / |
2 | / | |
3 | / A L O G | |
4 | / - - - - | |
5 | / | |
6 | /SUBROUTINE ALOG(X) | |
7 | / | |
8 | / VERSION 5A 4-26-77 (MH) | |
9 | / | |
10 | SECT ALOG | |
11 | JA #ALOG | |
12 | 0 /WORKING SPACE FOR EXPONENT DIDDLE. | |
13 | 0 | |
14 | 0 | |
15 | ALOGTM, 0 | |
16 | 0 | |
17 | 0 | |
18 | 0 | |
19 | F2ALOG, F 2. | |
20 | FPI2, 1 | |
21 | 3110 | |
22 | 3755 | |
23 | / | |
24 | EXTERN #ARGER | |
25 | ALOG0, TRAP4 #ARGER | |
26 | JA ALGRTN /RETURN NOW. | |
27 | / | |
28 | EXTERN #ARGER | |
29 | ALOGM1, TRAP4 #ARGER | |
30 | JA ALGRTN | |
31 | TEXT +ALOG + | |
32 | ALOGXR, | |
33 | BPALOG, F 0.0 | |
34 | XRALOG, F 0.0 | |
35 | ALOG1, F 0.0 | |
36 | ALOG2, F 0.0 | |
37 | F1ALOG, F 1. | |
38 | / | |
39 | ALOGMG, 0 | |
40 | 0 | |
41 | 13 /CORRECT EXPONENT DIDDLER. | |
42 | / | |
43 | / | |
44 | / | |
45 | / | |
46 | ALOGL1, 0 | |
47 | 3777 | |
48 | 7742 | |
49 | / | |
50 | ALOGE2, 0 | |
51 | 2613 | |
52 | 4414 | |
53 | / | |
54 | ORG 10*3+BPALOG | |
55 | FNOP | |
56 | JA ALOGXR | |
57 | 0 | |
58 | ALGRTN, JA . | |
59 | ALOGL2, 7777 | |
60 | 4000 | |
61 | 4100 | |
62 | / | |
63 | ALOGL3, 7777 | |
64 | 2517 | |
65 | 0310 | |
66 | / | |
67 | ALOGL4, 7776 | |
68 | 4113 | |
69 | 7211 | |
70 | / | |
71 | ALOGL5, 7776 | |
72 | 2535 | |
73 | 3301 | |
74 | / | |
75 | ALOGL6, 7775 | |
76 | 4746 | |
77 | 0771 | |
78 | / | |
79 | ALOGL7, 7774 | |
80 | 2236 | |
81 | 4304 | |
82 | / | |
83 | ALOGL8, 7771 | |
84 | 4544 | |
85 | 1735 | |
86 | BASE 0 | |
87 | #ALOG, STARTD | |
88 | FLDA 10*3 | |
89 | FSTA ALGRTN | |
90 | FLDA 0 | |
91 | SETX XRALOG | |
92 | SETB BPALOG | |
93 | BASE BPALOG | |
94 | LDX 1,1 | |
95 | FSTA BPALOG | |
96 | FLDA% BPALOG,1 /ADDR OF X | |
97 | FSTA BPALOG | |
98 | STARTF | |
99 | FLDA% BPALOG /GET X | |
100 | JEQ ALOG0 /IF =0 THEN ERROR | |
101 | JLT ALOGM1 /IF<0 THEN ERROR | |
102 | LDX -1,0 /IF >0 THEN START DOING | |
103 | FSTA ALOG1 /SAVE IN A TEMP. | |
104 | FSUB F1ALOG /KNOCK OFF ONE. | |
105 | JEQ ALGRTN /IF ZERO EXIT. LOG(1)=0 | |
106 | JGE ALOGST /IF POSITIVE LOG>0 | |
107 | FLDA F1ALOG /NEGITE. INVERT IT. | |
108 | FDIV ALOG1 /BY DIVIDING INTO ONE. | |
109 | FSTA ALOG1 | |
110 | LDX 0,0 /RESET SIGN TO NEGATIVE. | |
111 | JA .+3 /AVOID USELESS LOAD INSTRUCTION. | |
112 | / | |
113 | ALOGST, FLDA ALOG1 /RECALL NUMBER. | |
114 | FDIV F2ALOG /CUT IN HALF. | |
115 | FSTA ALOGTM /PREPARE FOR EXPONENT DIDDLE. | |
116 | FLDA ALOGMG /SET THE EXPONENT OF THE EXPONENT TO 13. | |
117 | FSTA ALOGTM-3 /SO THAT NORMALIZE WILL DO JOB. | |
118 | FSTA ALOGTM+1 /AND ALSO ZERO OUT LOW ORDER POART OF EX. MANT. | |
119 | FLDA ALOGTM-1 /RECALL THE NUMBER | |
120 | FNORM /NORMALIZE IT. | |
121 | FMUL ALOGE2 /NOW MULITPLY EXPONENT BY LOG E 2 | |
122 | FSTA ALOG2 /AND SAVE IT FOR A SECOND. | |
123 | FLDA ALOG1 /RECALL THE NUMBER AGAIN. | |
124 | FSTA ALOGTM /STORE IN THE TEMPORARY WORKER. | |
125 | FLDA FPI2-2 /RECALL WORD WITH LOW ORDER ONE. | |
126 | FSTA ALOGTM-2 /STORE AWAY. | |
127 | FLDA ALOGTM /RECALL NUMBER WITH AN EXPONENT OF 1 | |
128 | FSUB F1ALOG /SUBTRACT AWAY. | |
129 | FSTA ALOG1 /AND STORE | |
130 | FMUL ALOGL8 /MULTIPLY BY THE CONSTANT. | |
131 | FADD ALOGL7 /ADD IN | |
132 | FMUL ALOG1 /MULT. | |
133 | FADD ALOGL6 /AND SO ON DOWN THE LINE. | |
134 | FMUL ALOG1 | |
135 | FADD ALOGL5 | |
136 | FMUL ALOG1 | |
137 | FADD ALOGL4 | |
138 | FMUL ALOG1 | |
139 | FADD ALOGL3 | |
140 | FMUL ALOG1 | |
141 | FADD ALOGL2 | |
142 | FMUL ALOG1 | |
143 | FADD ALOGL1 | |
144 | FMUL ALOG1 | |
145 | FADD ALOG2 /CORRECT NOW.ADD IN EXPONENT. | |
146 | JXN ALGRTN,0 /EXIT IF SIGN IS OK. | |
147 | FNEG /ELSE NEGATE IT. | |
148 | JA ALGRTN | |
149 | \f |