projects / pdp8.git / blame
| Commit | Line | Data |
|---|---|---|
| 7af5ad59 PH |
1 | / |
| 2 | / | |
| 3 | / D S Q R T | |
| 4 | / | |
| 5 | / VERSION 5A 4-27-77 PT | |
| 6 | / | |
| 7 | SECT DSQRT | |
| 8 | JA #DSQRT | |
| 9 | DPCHK | |
| 10 | TEXT +DSQRT + | |
| 11 | / | |
| 12 | DSQXR, SETX XRDSQ | |
| 13 | SETB BPDSQ | |
| 14 | JA .+3 | |
| 15 | BPDSQ, F 0.0 | |
| 16 | XRDSQ, F 0.0 | |
| 17 | DARSAV, F 0.0 | |
| 18 | F 0.0 | |
| 19 | DSQ2, F 2.0 | |
| 20 | F 0.0 | |
| 21 | SNGL, F 0.0 | |
| 22 | F 0.0 | |
| 23 | ORG 10*3+BPDSQ | |
| 24 | FNOP | |
| 25 | JA DSQXR | |
| 26 | / | |
| 27 | 0 | |
| 28 | DSQRTN, JA . | |
| 29 | DSQ1, F 0.0 | |
| 30 | F 0.0 | |
| 31 | /PICK UP ARGUMENTS | |
| 32 | BASE 0 | |
| 33 | #DSQRT, STARTD | |
| 34 | FLDA 10*3 | |
| 35 | FSTA DSQRTN | |
| 36 | FLDA 0 | |
| 37 | SETX XRDSQ | |
| 38 | SETB BPDSQ | |
| 39 | BASE BPDSQ | |
| 40 | LDX 1,1 | |
| 41 | FSTA BPDSQ | |
| 42 | FLDA% BPDSQ,1 /ADDR OF X | |
| 43 | FSTA BPDSQ | |
| 44 | / | |
| 45 | /DO GENERAL TESTS ON THE ARGUMENT | |
| 46 | / | |
| 47 | STARTE | |
| 48 | FLDA% BPDSQ | |
| 49 | JEQ DSQRTN /RETURN IF 0 | |
| 50 | JLT DSQER /<0 ERROR | |
| 51 | FSTA DARSAV /SAVE DOUBLE | |
| 52 | STARTF /F MODE + ROUND | |
| 53 | FSTA SNGL /SAVE | |
| 54 | / | |
| 55 | /GET INITIAL APPROXIMATION BY CALLING | |
| 56 | /SINGLE PRECISION ROUTINE | |
| 57 | / | |
| 58 | EXTERN SQRT | |
| 59 | JSR SQRT | |
| 60 | JA .+4 | |
| 61 | JA SNGL | |
| 62 | FSTA SNGL /FIRST APPROX | |
| 63 | STARTE /BACK TO E | |
| 64 | / | |
| 65 | /TAKE N ITERATIONS OF | |
| 66 | /X(K+1)=1/2(X(K)+X/X(K)) | |
| 67 | / | |
| 68 | LDX -3,0 /3 TIMES | |
| 69 | DSIT, FLDA DARSAV /GET X | |
| 70 | FDIV SNGL /X(K) | |
| 71 | FADD SNGL /X(K) | |
| 72 | FDIV DSQ2 /DIVIDE BY 2 | |
| 73 | FSTA SNGL /X(K+1) | |
| 74 | JXN DSIT,0+ /ITERATE | |
| 75 | FLDA SNGL /GET ANSWER | |
| 76 | JA DSQRTN /RETURN | |
| 77 | EXTERN #ARGER | |
| 78 | DSQER, TRAP4 #ARGER | |
| 79 | \f |