D1MACH
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C
C----------------------------------------------------------------------
C FUNCTION: D1MACH
C THIS ROUTINE IS FROM THE PORT MATHEMATICAL SUBROUTINE LIBRARY
C IT IS DESCRIBED IN THE BELL LABORATORIES COMPUTING SCIENCE
C TECHNICAL REPORT #47 BY P.A. FOX, A.D. HALL AND N.L. SCHRYER
C A MODIFICATION TO THE "I OUT OF BOUNDS" ERROR MESSAGE
C HAS BEEN MADE BY C. A. MCGONEGAL - APRIL, 1978
C----------------------------------------------------------------------
C
DOUBLE PRECISION FUNCTION D1MACH(I)
C
C DOUBLE-PRECISION MACHINE CONSTANTS
C
C D1MACH( 1) = B**(EMIN-1), THE SMALLEST POSITIVE MAGNITUDE.
C
C D1MACH( 2) = B**EMAX*(1 - B**(-T)), THE LARGEST MAGNITUDE.
C
C D1MACH( 3) = B**(-T), THE SMALLEST RELATIVE SPACING.
C
C D1MACH( 4) = B**(1-T), THE LARGEST RELATIVE SPACING.
C
C D1MACH( 5) = LOG10(B)
C
C TO ALTER THIS FUNCTION FOR A PARTICULAR ENVIRONMENT,
C THE DESIRED SET OF DATA STATEMENTS SHOULD BE ACTIVATED BY
C REMOVING THE C FROM COLUMN 1.
C
C WHERE POSSIBLE, OCTAL OR HEXADECIMAL CONSTANTS HAVE BEEN USED
C TO SPECIFY THE CONSTANTS EXACTLY WHICH HAS IN SOME CASES
C REQUIRED THE USE OF EQUIVALENT INTEGER ARRAYS.
C
INTEGER SMALL(4)
INTEGER LARGE(4)
INTEGER RIGHT(4)
INTEGER DIVER(4)
INTEGER LOG10(4)
C
DOUBLE PRECISION DMACH(5)
C
EQUIVALENCE (DMACH(1),SMALL(1))
EQUIVALENCE (DMACH(2),LARGE(1))
EQUIVALENCE (DMACH(3),RIGHT(1))
EQUIVALENCE (DMACH(4),DIVER(1))
EQUIVALENCE (DMACH(5),LOG10(1))
C
C MACHINE CONSTANTS FOR THE BURROUGHS 1700 SYSTEM.
C
C DATA SMALL(1) / ZC00800000 /
C DATA SMALL(2) / Z000000000 /
C
C DATA LARGE(1) / ZDFFFFFFFF /
C DATA LARGE(2) / ZFFFFFFFFF /
C
C DATA RIGHT(1) / ZCC5800000 /
C DATA RIGHT(2) / Z000000000 /
C
C DATA DIVER(1) / ZCC6800000 /
C DATA DIVER(2) / Z000000000 /
C
C DATA LOG10(1) / ZD00E730E7 /
C DATA LOG10(2) / ZC77800DC0 /
C
C MACHINE CONSTANTS FOR THE BURROUGHS 5700 SYSTEM.
C
C DATA SMALL(1) / O1771000000000000 /
C DATA SMALL(2) / O0000000000000000 /
C
C DATA LARGE(1) / O0777777777777777 /
C DATA LARGE(2) / O0007777777777777 /
C
C DATA RIGHT(1) / O1461000000000000 /
C DATA RIGHT(2) / O0000000000000000 /
C
C DATA DIVER(1) / O1451000000000000 /
C DATA DIVER(2) / O0000000000000000 /
C
C DATA LOG10(1) / O1157163034761674 /
C DATA LOG10(2) / O0006677466732724 /
C
C MACHINE CONSTANTS FOR THE BURROUGHS 6700/7700 SYSTEMS.
C
C DATA SMALL(1) / O1771000000000000 /
C DATA SMALL(2) / O7770000000000000 /
C
C DATA LARGE(1) / O0777777777777777 /
C DATA LARGE(2) / O7777777777777777 /
C
C DATA RIGHT(1) / O1461000000000000 /
C DATA RIGHT(2) / O0000000000000000 /
C
C DATA DIVER(1) / O1451000000000000 /
C DATA DIVER(2) / O0000000000000000 /
C
C DATA LOG10(1) / O1157163034761674 /
C DATA LOG10(2) / O0006677466732724 /
C
C MACHINE CONSTANTS FOR THE CDC 6000/7000 SERIES.
C
C DATA SMALL(1) / 00604000000000000000B /
C DATA SMALL(2) / 00000000000000000000B /
C
C DATA LARGE(1) / 37767777777777777777B /
C DATA LARGE(2) / 37167777777777777777B /
C
C DATA RIGHT(1) / 15604000000000000000B /
C DATA RIGHT(2) / 15000000000000000000B /
C
C DATA DIVER(1) / 15614000000000000000B /
C DATA DIVER(2) / 15010000000000000000B /
C
C DATA LOG10(1) / 17164642023241175717B /
C DATA LOG10(2) / 16367571421742254654B /
C
C MACHINE CONSTANTS FOR THE CRAY 1
C
C DATA SMALL(1) / 200004000000000000000B /
C DATA SMALL(2) / 000000000000000000000B /
C
C DATA LARGE(1) / 577767777777777777777B /
C DATA LARGE(2) / 000007777777777777776B /
C
C DATA RIGHT(1) / 376424000000000000000B /
C DATA RIGHT(2) / 000000000000000000000B /
C
C DATA DIVER(1) / 376434000000000000000B /
C DATA DIVER(2) / 000000000000000000000B /
C
C DATA LOG10(1) / 377774642023241175717B /
C DATA LOG10(2) / 000007571421742254654B /
C
C MACHINE CONSTANTS FOR THE DATA GENERAL ECLIPSE S/200
C
C NOTE - IT MAY BE APPROPRIATE TO INCLUDE THE FOLLOWING CARD -
C STATIC DMACH(5)
C
C DATA SMALL/20K,3*0/,LARGE/77777K,3*177777K/
C DATA RIGHT/31420K,3*0/,DIVER/32020K,3*0/
C DATA LOG10/40423K,42023K,50237K,74776K/
C
C MACHINE CONSTANTS FOR THE HARRIS SLASH 6 AND SLASH 7
C
C DATA SMALL(1),SMALL(2) / '20000000, '00000201 /
C DATA LARGE(1),LARGE(2) / '37777777, '37777577 /
C DATA RIGHT(1),RIGHT(2) / '20000000, '00000333 /
C DATA DIVER(1),DIVER(2) / '20000000, '00000334 /
C DATA LOG10(1),LOG10(2) / '23210115, '10237777 /
C
C MACHINE CONSTANTS FOR THE HONEYWELL 600/6000 SERIES.
C
C DATA SMALL(1),SMALL(2) / O402400000000, O000000000000 /
C DATA LARGE(1),LARGE(2) / O376777777777, O777777777777 /
C DATA RIGHT(1),RIGHT(2) / O604400000000, O000000000000 /
C DATA DIVER(1),DIVER(2) / O606400000000, O000000000000 /
C DATA LOG10(1),LOG10(2) / O776464202324, O117571775714 /
C
C MACHINE CONSTANTS FOR THE IBM 360/370 SERIES,
C THE XEROX SIGMA 5/7/9 AND THE SEL SYSTEMS 85/86.
C
C DATA SMALL(1),SMALL(2) / Z00100000, Z00000000 /
C DATA LARGE(1),LARGE(2) / Z7FFFFFFF, ZFFFFFFFF /
C DATA RIGHT(1),RIGHT(2) / Z33100000, Z00000000 /
C DATA DIVER(1),DIVER(2) / Z34100000, Z00000000 /
C DATA LOG10(1),LOG10(2) / Z41134413, Z509F79FF /
C
C MACHINE CONSTANTS FOR THE PDP-10 (KA PROCESSOR).
C
C DATA SMALL(1),SMALL(2) / "033400000000, "000000000000 /
C DATA LARGE(1),LARGE(2) / "377777777777, "344777777777 /
C DATA RIGHT(1),RIGHT(2) / "113400000000, "000000000000 /
C DATA DIVER(1),DIVER(2) / "114400000000, "000000000000 /
C DATA LOG10(1),LOG10(2) / "177464202324, "144117571776 /
C
C MACHINE CONSTANTS FOR THE PDP-10 (KI PROCESSOR).
C
C DATA SMALL(1),SMALL(2) / "000400000000, "000000000000 /
C DATA LARGE(1),LARGE(2) / "377777777777, "377777777777 /
C DATA RIGHT(1),RIGHT(2) / "103400000000, "000000000000 /
C DATA DIVER(1),DIVER(2) / "104400000000, "000000000000 /
C DATA LOG10(1),LOG10(2) / "177464202324, "476747767461 /
C
C MACHINE CONSTANTS FOR PDP-11 FORTRAN'S SUPPORTING
C 32-BIT INTEGERS (EXPRESSED IN INTEGER AND OCTAL).
C
C DATA SMALL(1),SMALL(2) / 8388608, 0 /
C DATA LARGE(1),LARGE(2) / 2147483647, -1 /
C DATA RIGHT(1),RIGHT(2) / 612368384, 0 /
C DATA DIVER(1),DIVER(2) / 620756992, 0 /
C DATA LOG10(1),LOG10(2) / 1067065498, -2063872008 /
C
C DATA SMALL(1),SMALL(2) / O00040000000, O00000000000 /
C DATA LARGE(1),LARGE(2) / O17777777777, O37777777777 /
C DATA RIGHT(1),RIGHT(2) / O04440000000, O00000000000 /
C DATA DIVER(1),DIVER(2) / O04500000000, O00000000000 /
C DATA LOG10(1),LOG10(2) / O07746420232, O20476747770 /
C
C MACHINE CONSTANTS FOR PDP-11 FORTRAN'S SUPPORTING
C 16-BIT INTEGERS (EXPRESSED IN INTEGER AND OCTAL).
C
C DATA SMALL(1),SMALL(2) / 128, 0 /
C DATA SMALL(3),SMALL(4) / 0, 0 /
C
C DATA LARGE(1),LARGE(2) / 32767, -1 /
C DATA LARGE(3),LARGE(4) / -1, -1 /
C
C DATA RIGHT(1),RIGHT(2) / 9344, 0 /
C DATA RIGHT(3),RIGHT(4) / 0, 0 /
C
C DATA DIVER(1),DIVER(2) / 9472, 0 /
C DATA DIVER(3),DIVER(4) / 0, 0 /
C
C DATA LOG10(1),LOG10(2) / 16282, 8346 /
C DATA LOG10(3),LOG10(4) / -31493, -12296 /
C
C DATA SMALL(1),SMALL(2) / O000200, O000000 /
C DATA SMALL(3),SMALL(4) / O000000, O000000 /
C
C DATA LARGE(1),LARGE(2) / O077777, O177777 /
C DATA LARGE(3),LARGE(4) / O177777, O177777 /
C
C DATA RIGHT(1),RIGHT(2) / O022200, O000000 /
C DATA RIGHT(3),RIGHT(4) / O000000, O000000 /
C
C DATA DIVER(1),DIVER(2) / O022400, O000000 /
C DATA DIVER(3),DIVER(4) / O000000, O000000 /
C
C DATA LOG10(1),LOG10(2) / O037632, O020232 /
C DATA LOG10(3),LOG10(4) / O102373, O147770 /
C
C MACHINE CONSTANTS FOR THE UNIVAC 1100 SERIES.
C
C DATA SMALL(1),SMALL(2) / O000040000000, O000000000000 /
C DATA LARGE(1),LARGE(2) / O377777777777, O777777777777 /
C DATA RIGHT(1),RIGHT(2) / O170540000000, O000000000000 /
C DATA DIVER(1),DIVER(2) / O170640000000, O000000000000 /
C DATA LOG10(1),LOG10(2) / O177746420232, O411757177572 /
C
C MACHINE CONSTANTS FOR THE VAX-11 WITH
C FORTRAN IV-PLUS COMPILER
C
C DATA SMALL(1),SMALL(2) / Z00000080, Z00000000 /
C DATA LARGE(1),LARGE(2) / ZFFFF7FFF, ZFFFFFFFF /
C DATA RIGHT(1),RIGHT(2) / Z00002480, Z00000000 /
C DATA DIVER(1),DIVER(2) / Z00002500, Z00000000 /
C DATA LOG10(1),LOG10(2) / Z209A3F9A, ZCFFA84FB /
C
IF (I .LT. 1 .OR. I .GT. 5) GOTO 100
C
D1MACH = DMACH(I)
RETURN
C
100 IWUNIT = I1MACH(4)
WRITE(IWUNIT, 99)
99 FORMAT(25H D1MACH - I OUT OF BOUNDS)
STOP
END
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