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INTEGER FUNCTION ipmpar(i)
C-----------------------------------------------------------------------
C
C IPMPAR PROVIDES THE INTEGER MACHINE CONSTANTS FOR THE COMPUTER
C THAT IS USED. IT IS ASSUMED THAT THE ARGUMENT I IS AN INTEGER
C HAVING ONE OF THE VALUES 1-10. IPMPAR(I) HAS THE VALUE ...
C
C INTEGERS.
C
C ASSUME INTEGERS ARE REPRESENTED IN THE N-DIGIT, BASE-A FORM
C
C SIGN ( X(N-1)*A**(N-1) + ... + X(1)*A + X(0) )
C
C WHERE 0 .LE. X(I) .LT. A FOR I=0,...,N-1.
C
C IPMPAR(1) = A, THE BASE.
C
C IPMPAR(2) = N, THE NUMBER OF BASE-A DIGITS.
C
C IPMPAR(3) = A**N - 1, THE LARGEST MAGNITUDE.
C
C FLOATING-POINT NUMBERS.
C
C IT IS ASSUMED THAT THE SINGLE AND DOUBLE PRECISION FLOATING
C POINT ARITHMETICS HAVE THE SAME BASE, SAY B, AND THAT THE
C NONZERO NUMBERS ARE REPRESENTED IN THE FORM
C
C SIGN (B**E) * (X(1)/B + ... + X(M)/B**M)
C
C WHERE X(I) = 0,1,...,B-1 FOR I=1,...,M,
C X(1) .GE. 1, AND EMIN .LE. E .LE. EMAX.
C
C IPMPAR(4) = B, THE BASE.
C
C SINGLE-PRECISION
C
C IPMPAR(5) = M, THE NUMBER OF BASE-B DIGITS.
C
C IPMPAR(6) = EMIN, THE SMALLEST EXPONENT E.
C
C IPMPAR(7) = EMAX, THE LARGEST EXPONENT E.
C
C DOUBLE-PRECISION
C
C IPMPAR(8) = M, THE NUMBER OF BASE-B DIGITS.
C
C IPMPAR(9) = EMIN, THE SMALLEST EXPONENT E.
C
C IPMPAR(10) = EMAX, THE LARGEST EXPONENT E.
C
C-----------------------------------------------------------------------
C
C TO DEFINE THIS FUNCTION FOR THE COMPUTER BEING USED, ACTIVATE
C THE DATA STATMENTS FOR THE COMPUTER BY REMOVING THE C FROM
C COLUMN 1. (ALL THE OTHER DATA STATEMENTS SHOULD HAVE C IN
C COLUMN 1.)
C
C-----------------------------------------------------------------------
C
C IPMPAR IS AN ADAPTATION OF THE FUNCTION I1MACH, WRITTEN BY
C P.A. FOX, A.D. HALL, AND N.L. SCHRYER (BELL LABORATORIES).
C IPMPAR WAS FORMED BY A.H. MORRIS (NSWC). THE CONSTANTS ARE
C FROM BELL LABORATORIES, NSWC, AND OTHER SOURCES.
C
C-----------------------------------------------------------------------
C .. Scalar Arguments ..
INTEGER i
C ..
C .. Local Arrays ..
INTEGER imach(10)
C ..
C .. Data statements ..
C
C MACHINE CONSTANTS FOR AMDAHL MACHINES.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 31 /
C DATA IMACH( 3) / 2147483647 /
C DATA IMACH( 4) / 16 /
C DATA IMACH( 5) / 6 /
C DATA IMACH( 6) / -64 /
C DATA IMACH( 7) / 63 /
C DATA IMACH( 8) / 14 /
C DATA IMACH( 9) / -64 /
C DATA IMACH(10) / 63 /
C
C MACHINE CONSTANTS FOR THE AT&T 3B SERIES, AT&T
C PC 7300, AND AT&T 6300.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 31 /
C DATA IMACH( 3) / 2147483647 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / -125 /
C DATA IMACH( 7) / 128 /
C DATA IMACH( 8) / 53 /
C DATA IMACH( 9) / -1021 /
C DATA IMACH(10) / 1024 /
C
C MACHINE CONSTANTS FOR THE BURROUGHS 1700 SYSTEM.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 33 /
C DATA IMACH( 3) / 8589934591 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / -256 /
C DATA IMACH( 7) / 255 /
C DATA IMACH( 8) / 60 /
C DATA IMACH( 9) / -256 /
C DATA IMACH(10) / 255 /
C
C MACHINE CONSTANTS FOR THE BURROUGHS 5700 SYSTEM.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 39 /
C DATA IMACH( 3) / 549755813887 /
C DATA IMACH( 4) / 8 /
C DATA IMACH( 5) / 13 /
C DATA IMACH( 6) / -50 /
C DATA IMACH( 7) / 76 /
C DATA IMACH( 8) / 26 /
C DATA IMACH( 9) / -50 /
C DATA IMACH(10) / 76 /
C
C MACHINE CONSTANTS FOR THE BURROUGHS 6700/7700 SYSTEMS.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 39 /
C DATA IMACH( 3) / 549755813887 /
C DATA IMACH( 4) / 8 /
C DATA IMACH( 5) / 13 /
C DATA IMACH( 6) / -50 /
C DATA IMACH( 7) / 76 /
C DATA IMACH( 8) / 26 /
C DATA IMACH( 9) / -32754 /
C DATA IMACH(10) / 32780 /
C
C MACHINE CONSTANTS FOR THE CDC 6000/7000 SERIES
C 60 BIT ARITHMETIC, AND THE CDC CYBER 995 64 BIT
C ARITHMETIC (NOS OPERATING SYSTEM).
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 48 /
C DATA IMACH( 3) / 281474976710655 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 48 /
C DATA IMACH( 6) / -974 /
C DATA IMACH( 7) / 1070 /
C DATA IMACH( 8) / 95 /
C DATA IMACH( 9) / -926 /
C DATA IMACH(10) / 1070 /
C
C MACHINE CONSTANTS FOR THE CDC CYBER 995 64 BIT
C ARITHMETIC (NOS/VE OPERATING SYSTEM).
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 63 /
C DATA IMACH( 3) / 9223372036854775807 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 48 /
C DATA IMACH( 6) / -4096 /
C DATA IMACH( 7) / 4095 /
C DATA IMACH( 8) / 96 /
C DATA IMACH( 9) / -4096 /
C DATA IMACH(10) / 4095 /
C
C MACHINE CONSTANTS FOR THE CRAY 1, XMP, 2, AND 3.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 63 /
C DATA IMACH( 3) / 9223372036854775807 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 47 /
C DATA IMACH( 6) / -8189 /
C DATA IMACH( 7) / 8190 /
C DATA IMACH( 8) / 94 /
C DATA IMACH( 9) / -8099 /
C DATA IMACH(10) / 8190 /
C
C MACHINE CONSTANTS FOR THE DATA GENERAL ECLIPSE S/200.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 15 /
C DATA IMACH( 3) / 32767 /
C DATA IMACH( 4) / 16 /
C DATA IMACH( 5) / 6 /
C DATA IMACH( 6) / -64 /
C DATA IMACH( 7) / 63 /
C DATA IMACH( 8) / 14 /
C DATA IMACH( 9) / -64 /
C DATA IMACH(10) / 63 /
C
C MACHINE CONSTANTS FOR THE HARRIS 220.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 23 /
C DATA IMACH( 3) / 8388607 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 23 /
C DATA IMACH( 6) / -127 /
C DATA IMACH( 7) / 127 /
C DATA IMACH( 8) / 38 /
C DATA IMACH( 9) / -127 /
C DATA IMACH(10) / 127 /
C
C MACHINE CONSTANTS FOR THE HONEYWELL 600/6000
C AND DPS 8/70 SERIES.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 35 /
C DATA IMACH( 3) / 34359738367 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 27 /
C DATA IMACH( 6) / -127 /
C DATA IMACH( 7) / 127 /
C DATA IMACH( 8) / 63 /
C DATA IMACH( 9) / -127 /
C DATA IMACH(10) / 127 /
C
C MACHINE CONSTANTS FOR THE HP 2100
C 3 WORD DOUBLE PRECISION OPTION WITH FTN4
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 15 /
C DATA IMACH( 3) / 32767 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 23 /
C DATA IMACH( 6) / -128 /
C DATA IMACH( 7) / 127 /
C DATA IMACH( 8) / 39 /
C DATA IMACH( 9) / -128 /
C DATA IMACH(10) / 127 /
C
C MACHINE CONSTANTS FOR THE HP 2100
C 4 WORD DOUBLE PRECISION OPTION WITH FTN4
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 15 /
C DATA IMACH( 3) / 32767 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 23 /
C DATA IMACH( 6) / -128 /
C DATA IMACH( 7) / 127 /
C DATA IMACH( 8) / 55 /
C DATA IMACH( 9) / -128 /
C DATA IMACH(10) / 127 /
C
C MACHINE CONSTANTS FOR THE HP 9000.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 31 /
C DATA IMACH( 3) / 2147483647 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / -126 /
C DATA IMACH( 7) / 128 /
C DATA IMACH( 8) / 53 /
C DATA IMACH( 9) / -1021 /
C DATA IMACH(10) / 1024 /
C
C MACHINE CONSTANTS FOR THE IBM 360/370 SERIES,
C THE ICL 2900, THE ITEL AS/6, THE XEROX SIGMA
C 5/7/9 AND THE SEL SYSTEMS 85/86.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 31 /
C DATA IMACH( 3) / 2147483647 /
C DATA IMACH( 4) / 16 /
C DATA IMACH( 5) / 6 /
C DATA IMACH( 6) / -64 /
C DATA IMACH( 7) / 63 /
C DATA IMACH( 8) / 14 /
C DATA IMACH( 9) / -64 /
C DATA IMACH(10) / 63 /
C
C MACHINE CONSTANTS FOR THE IBM PC.
C
C DATA imach(1)/2/
C DATA imach(2)/31/
C DATA imach(3)/2147483647/
C DATA imach(4)/2/
C DATA imach(5)/24/
C DATA imach(6)/-125/
C DATA imach(7)/128/
C DATA imach(8)/53/
C DATA imach(9)/-1021/
C DATA imach(10)/1024/
C
C MACHINE CONSTANTS FOR THE MACINTOSH II - ABSOFT
C MACFORTRAN II.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 31 /
C DATA IMACH( 3) / 2147483647 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / -125 /
C DATA IMACH( 7) / 128 /
C DATA IMACH( 8) / 53 /
C DATA IMACH( 9) / -1021 /
C DATA IMACH(10) / 1024 /
C
C MACHINE CONSTANTS FOR THE MICROVAX - VMS FORTRAN.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 31 /
C DATA IMACH( 3) / 2147483647 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / -127 /
C DATA IMACH( 7) / 127 /
C DATA IMACH( 8) / 56 /
C DATA IMACH( 9) / -127 /
C DATA IMACH(10) / 127 /
C
C MACHINE CONSTANTS FOR THE PDP-10 (KA PROCESSOR).
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 35 /
C DATA IMACH( 3) / 34359738367 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 27 /
C DATA IMACH( 6) / -128 /
C DATA IMACH( 7) / 127 /
C DATA IMACH( 8) / 54 /
C DATA IMACH( 9) / -101 /
C DATA IMACH(10) / 127 /
C
C MACHINE CONSTANTS FOR THE PDP-10 (KI PROCESSOR).
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 35 /
C DATA IMACH( 3) / 34359738367 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 27 /
C DATA IMACH( 6) / -128 /
C DATA IMACH( 7) / 127 /
C DATA IMACH( 8) / 62 /
C DATA IMACH( 9) / -128 /
C DATA IMACH(10) / 127 /
C
C MACHINE CONSTANTS FOR THE PDP-11 FORTRAN SUPPORTING
C 32-BIT INTEGER ARITHMETIC.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 31 /
C DATA IMACH( 3) / 2147483647 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / -127 /
C DATA IMACH( 7) / 127 /
C DATA IMACH( 8) / 56 /
C DATA IMACH( 9) / -127 /
C DATA IMACH(10) / 127 /
C
C MACHINE CONSTANTS FOR THE SEQUENT BALANCE 8000.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 31 /
C DATA IMACH( 3) / 2147483647 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / -125 /
C DATA IMACH( 7) / 128 /
C DATA IMACH( 8) / 53 /
C DATA IMACH( 9) / -1021 /
C DATA IMACH(10) / 1024 /
C
C MACHINE CONSTANTS FOR THE SILICON GRAPHICS IRIS-4D
C SERIES (MIPS R3000 PROCESSOR).
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 31 /
C DATA IMACH( 3) / 2147483647 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / -125 /
C DATA IMACH( 7) / 128 /
C DATA IMACH( 8) / 53 /
C DATA IMACH( 9) / -1021 /
C DATA IMACH(10) / 1024 /
C
C MACHINE CONSTANTS FOR IEEE ARITHMETIC MACHINES, SUCH AS THE AT&T
C 3B SERIES, MOTOROLA 68000 BASED MACHINES (E.G. SUN 3 AND AT&T
C PC 7300), AND 8087 BASED MICROS (E.G. IBM PC AND AT&T 6300).
C
DATA IMACH( 1) / 2 /
DATA IMACH( 2) / 31 /
DATA IMACH( 3) / 2147483647 /
DATA IMACH( 4) / 2 /
DATA IMACH( 5) / 24 /
DATA IMACH( 6) / -125 /
DATA IMACH( 7) / 128 /
DATA IMACH( 8) / 53 /
DATA IMACH( 9) / -1021 /
DATA IMACH(10) / 1024 /
C
C MACHINE CONSTANTS FOR THE UNIVAC 1100 SERIES.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 35 /
C DATA IMACH( 3) / 34359738367 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 27 /
C DATA IMACH( 6) / -128 /
C DATA IMACH( 7) / 127 /
C DATA IMACH( 8) / 60 /
C DATA IMACH( 9) /-1024 /
C DATA IMACH(10) / 1023 /
C
C MACHINE CONSTANTS FOR THE VAX 11/780.
C
C DATA IMACH( 1) / 2 /
C DATA IMACH( 2) / 31 /
C DATA IMACH( 3) / 2147483647 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / -127 /
C DATA IMACH( 7) / 127 /
C DATA IMACH( 8) / 56 /
C DATA IMACH( 9) / -127 /
C DATA IMACH(10) / 127 /
C
ipmpar = imach(i)
RETURN
END
|
