ibm:ibm1130-lib:dmsr2v12:t1xsqr_lst
T1XSQR
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- t1xsqr.lst
ASM1130 CROSS ASSEMBLER V1.22 -- V2M12 -- Sun Nov 1 19:25:08 2020 Source File: \t1xsqr.asm 1 | *************************************************** T1C00010 2 | * * T1C00020 3 | * SUBROUTINE NAME- * T1C00030 4 | * FULL NAME- FIXED-POINT (FRACTIONAL) SQUARE * T1C00040 5 | * ROOT FUNCTION * T1C00050 6 | * CODE NAME- XSQR * T1C00060 7 | * PURPOSE- THIS SUBPROGRAM COMPUTES THE SQUARE * T1C00070 8 | * ROOT OF A FIXED POINT ONE-WORD FRACTIONAL * T1C00080 9 | * NUMBER. * T1C00090 10 | * METHOD-SEE IBM 1130 SUBROUTINE LIBRARY MANUAL.* T1C00100 11 | * CAPABILITIES AND LIMITATIONS- SEE IBM 1130 * T1C00110 12 | * SUBROUTINE LIBRARY MANUAL. * T1C00120 13 | * SPECIAL FEATURES- N/A * T1C00130 14 | * ADDITIONAL INFORMATION- * T1C00140 15 | * ESTIMATED EXECUTION TIME- SEE IBM 1130 * T1C00150 16 | * SUBROUTINE LIBRARY MANUAL * T1C00160 17 | * * T1C00170 18 | *************************************************** T1C00180 CALL XSQR -V1. 20 | ENT XSQR T1C00200 0000 0000 21 | XSQR DC *-* ENTRY/RETURN ADDRESS T1C00210 0001 D022 22 | STO A SAVE ARGUMENT (BINARY POINT T1C00220 0002 4C10 0008R 23 | BSC L OK,- BETWEEN SIGN AND ONE BIT) T1C00230 0004 1010 24 | SLA 16 IF ARGUMENT IS NEGATIVE, T1C00240 0005 901E 25 | S A USE MAGNITUDE AND TURN ON T1C00250 0006 D01D 26 | STO A OVERFLOW INDICATOR. T1C00260 0007 2003 27 | LDS 3 T1C00270 0008 4C08 001FR 28 | OK BSC L XSQX,+ SHORT CUT FOR 0.0 AND -1.0 T1C00280 000A 6912 29 | STX 1 EXIT+1 SAVE XR1 T1C00290 000B 610F 30 | LDX 1 15 SET CTR FOR TABLE REF. T1C00300 000C C017 31 | LD A INITIAL APPROXIMATION T1C00310 000D 1140 32 | SLCA 1 IS A FUNCTION OF T1C00320 000E C500 0025R 33 | LD L1 TABLE LEADING ZERO BITS. T1C00330 0010 D012 34 | LOOP STO FN SAVE APPROXIMATION T1C00340 0011 A011 35 | M FN CALC AN EXPRESSION CALLED T1C00350 0012 1081 36 | SLT 1 ERROR. T1C00360 0013 9010 37 | S A ERROR=FN*FN-A T1C00370 0014 1882 38 | SRT 2 DIV BY 2,ADJUST BINARY PT. T1C00380 0015 A80D 39 | D FN DELTA=0.5*ERROR/FN T1C00390 0016 4C08 001CR 40 | BSC L EXIT,+ EXIT WHEN DELTA=0.0 T1C00400 0018 D009 41 | STO DELTA OTHERWISE SAVE DELTA T1C00410 0019 C009 42 | LD FN MODIFY THE APPROXIMATION T1C00420 001A 9007 43 | S DELTA BY DELTA.FN=FN-DELTA. T1C00430 001B 70F4 44 | MDX LOOP REPEAT LOOP T1C00440 001C 6500 0000 45 | EXIT LDX L1 *-* RESTORE XR1 T1C00450 001E C004 46 | LD FN PUT RESULT IN ACC T1C00460 001F 4C80 0000R 47 | XSQX BSC I XSQR RETURN TO MAIN PROG T1C00470 48 | * T1C00480 49 | *CONSTANTS AREA T1C00490 50 | * T1C00500 0022 51 | BSS E 0 T1C00510 0022 0000 52 | DELTA DC 0 MODIFICATION BUFFER T1C00520 0023 0000 53 | FN DC 0 APPROXIMATION BUFFER T1C00530 0024 0000 54 | A DC 0 SAVE INPUT MAGNITUDE T1C00540 0025 00B6 55 | TABLE DC /00B6 0 TABLE OF INITIAL APPROX T1C00550 0026 013A 56 | DC /013A 1 IMATIONS BASED ON THE T1C00560 0027 01DF 57 | DC /01DF 2 NUMBER OF INITIAL ZEROS T1C00570 0028 02BE 58 | DC /02BE 3 IN THE INPUT ARGUMENT. T1C00580 0029 03F0 59 | DC /03F0 4 T1C00590 002A 059D 60 | DC /059D 5 T1C00600 002B 07F8 61 | DC /07F8 6 T1C00610 002C 0B4B 62 | DC /0B4B 7 T1C00620 002D 0FFC 63 | DC /0FFC 8 T1C00630 002E 169E 64 | DC /169E 9 T1C00640 002F 1FFE 65 | DC /1FFE 10 T1C00650 0030 2D40 66 | DC /2D40 11 T1C00660 0031 3FFF 67 | DC /3FFF 12 T1C00670 0032 5A82 68 | DC /5A82 13 T1C00680 0033 7FFF 69 | DC /7FFF 14 T1C00690 0034 70 | END T1C00700 There were no errors in this assembly === CROSS REFERENCES ========================================================== Name Val Defd Referenced A 0024R 54 22 25 26 31 37 DELTA 0022R 52 41 43 EXIT 001CR 45 29 40 FN 0023R 53 34 35 39 42 46 LOOP 0010R 34 44 OK 0008R 28 23 TABLE 0025R 55 33 XSQR 0000R 21 47 XSQX 001FR 47 28
ibm/ibm1130-lib/dmsr2v12/t1xsqr_lst.txt · Last modified: 2023/08/06 13:34 by Site Administrator