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INTEGER FUNCTION I1MACH(I)
C
C I/O UNIT NUMBERS.
C
C I1MACH( 1) = THE STANDARD INPUT UNIT.
C
C I1MACH( 2) = THE STANDARD OUTPUT UNIT.
C
C I1MACH( 3) = THE STANDARD PUNCH UNIT.
C
C I1MACH( 4) = THE STANDARD ERROR MESSAGE UNIT.
C
C WORDS.
C
C I1MACH( 5) = THE NUMBER OF BITS PER INTEGER STORAGE UNIT.
C
C I1MACH( 6) = THE NUMBER OF CHARACTERS PER CHARACTER STORAGE UNIT.
C FOR FORTRAN 77, THIS IS ALWAYS 1. FOR FORTRAN 66,
C CHARACTER STORAGE UNIT = INTEGER STORAGE UNIT.
C
C INTEGERS.
C
C ASSUME INTEGERS ARE REPRESENTED IN THE S-DIGIT, BASE-A FORM
C
C SIGN ( X(S-1)*A**(S-1) + ... + X(1)*A + X(0) )
C
C WHERE 0 .LE. X(I) .LT. A FOR I=0,...,S-1.
C
C I1MACH( 7) = A, THE BASE.
C
C I1MACH( 8) = S, THE NUMBER OF BASE-A DIGITS.
C
C I1MACH( 9) = A**S - 1, THE LARGEST MAGNITUDE.
C
C FLOATING-POINT NUMBERS.
C
C ASSUME FLOATING-POINT NUMBERS ARE REPRESENTED IN THE T-DIGIT,
C BASE-B FORM
C
C SIGN (B**E)*( (X(1)/B) + ... + (X(T)/B**T) )
C
C WHERE 0 .LE. X(I) .LT. B FOR I=1,...,T,
C 0 .LT. X(1), AND EMIN .LE. E .LE. EMAX.
C
C I1MACH(10) = B, THE BASE.
C
C SINGLE-PRECISION
C
C I1MACH(11) = T, THE NUMBER OF BASE-B DIGITS.
C
C I1MACH(12) = EMIN, THE SMALLEST EXPONENT E.
C
C I1MACH(13) = EMAX, THE LARGEST EXPONENT E.
C
C DOUBLE-PRECISION
C
C I1MACH(14) = T, THE NUMBER OF BASE-B DIGITS.
C
C I1MACH(15) = EMIN, THE SMALLEST EXPONENT E.
C
C I1MACH(16) = EMAX, THE LARGEST EXPONENT E.
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. ALSO, THE VALUES OF
C I1MACH(1) - I1MACH(4) SHOULD BE CHECKED FOR CONSISTENCY
C WITH THE LOCAL OPERATING SYSTEM. FOR FORTRAN 77, YOU MAY WISH
C TO ADJUST THE DATA STATEMENT SO IMACH(6) IS SET TO 1, AND
C THEN TO COMMENT OUT THE EXECUTABLE TEST ON I .EQ. 6 BELOW.
C ON RARE MACHINES A STATIC STATEMENT MAY NEED TO BE ADDED.
C (BUT PROBABLY MORE SYSTEMS PROHIBIT IT THAN REQUIRE IT.)
C
C FOR IEEE-ARITHMETIC MACHINES (BINARY STANDARD), THE FIRST
C SET OF CONSTANTS BELOW SHOULD BE APPROPRIATE, EXCEPT PERHAPS
C FOR IMACH(1) - IMACH(4).
C
INTEGER IMACH(16),OUTPUT,SANITY
C
EQUIVALENCE (IMACH(4),OUTPUT)
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
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / 2147483647 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -125 /
C DATA IMACH(13) / 128 /
C DATA IMACH(14) / 53 /
C DATA IMACH(15) / -1021 /
C DATA IMACH(16) / 1024 /, SANITY/987/
C
C MACHINE CONSTANTS FOR AMDAHL MACHINES.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / 2147483647 /
C DATA IMACH(10) / 16 /
C DATA IMACH(11) / 6 /
C DATA IMACH(12) / -64 /
C DATA IMACH(13) / 63 /
C DATA IMACH(14) / 14 /
C DATA IMACH(15) / -64 /
C DATA IMACH(16) / 63 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE BURROUGHS 1700 SYSTEM.
C
C DATA IMACH( 1) / 7 /
C DATA IMACH( 2) / 2 /
C DATA IMACH( 3) / 2 /
C DATA IMACH( 4) / 2 /
C DATA IMACH( 5) / 36 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 33 /
C DATA IMACH( 9) / Z1FFFFFFFF /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -256 /
C DATA IMACH(13) / 255 /
C DATA IMACH(14) / 60 /
C DATA IMACH(15) / -256 /
C DATA IMACH(16) / 255 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE BURROUGHS 5700 SYSTEM.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 48 /
C DATA IMACH( 6) / 6 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 39 /
C DATA IMACH( 9) / O0007777777777777 /
C DATA IMACH(10) / 8 /
C DATA IMACH(11) / 13 /
C DATA IMACH(12) / -50 /
C DATA IMACH(13) / 76 /
C DATA IMACH(14) / 26 /
C DATA IMACH(15) / -50 /
C DATA IMACH(16) / 76 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE BURROUGHS 6700/7700 SYSTEMS.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 48 /
C DATA IMACH( 6) / 6 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 39 /
C DATA IMACH( 9) / O0007777777777777 /
C DATA IMACH(10) / 8 /
C DATA IMACH(11) / 13 /
C DATA IMACH(12) / -50 /
C DATA IMACH(13) / 76 /
C DATA IMACH(14) / 26 /
C DATA IMACH(15) / -32754 /
C DATA IMACH(16) / 32780 /, SANITY/987/
C
C MACHINE CONSTANTS FOR FTN4 ON THE CDC 6000/7000 SERIES.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 60 /
C DATA IMACH( 6) / 10 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 48 /
C DATA IMACH( 9) / 00007777777777777777B /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 47 /
C DATA IMACH(12) / -929 /
C DATA IMACH(13) / 1070 /
C DATA IMACH(14) / 94 /
C DATA IMACH(15) / -929 /
C DATA IMACH(16) / 1069 /, SANITY/987/
C
C MACHINE CONSTANTS FOR FTN5 ON THE CDC 6000/7000 SERIES.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 60 /
C DATA IMACH( 6) / 10 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 48 /
C DATA IMACH( 9) / O"00007777777777777777" /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 47 /
C DATA IMACH(12) / -929 /
C DATA IMACH(13) / 1070 /
C DATA IMACH(14) / 94 /
C DATA IMACH(15) / -929 /
C DATA IMACH(16) / 1069 /, SANITY/987/
C
C MACHINE CONSTANTS FOR CONVEX C-1.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / 2147483647 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -128 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 53 /
C DATA IMACH(15) /-1024 /
C DATA IMACH(16) / 1023 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE CRAY 1, XMP, 2, AND 3.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 102 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 64 /
C DATA IMACH( 6) / 8 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 63 /
C DATA IMACH( 9) / 777777777777777777777B /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 47 /
C DATA IMACH(12) / -8189 /
C DATA IMACH(13) / 8190 /
C DATA IMACH(14) / 94 /
C DATA IMACH(15) / -8099 /
C DATA IMACH(16) / 8190 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE DATA GENERAL ECLIPSE S/200.
C
C DATA IMACH( 1) / 11 /
C DATA IMACH( 2) / 12 /
C DATA IMACH( 3) / 8 /
C DATA IMACH( 4) / 10 /
C DATA IMACH( 5) / 16 /
C DATA IMACH( 6) / 2 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 15 /
C DATA IMACH( 9) /32767 /
C DATA IMACH(10) / 16 /
C DATA IMACH(11) / 6 /
C DATA IMACH(12) / -64 /
C DATA IMACH(13) / 63 /
C DATA IMACH(14) / 14 /
C DATA IMACH(15) / -64 /
C DATA IMACH(16) / 63 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE HARRIS SLASH 6 AND SLASH 7.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 0 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 24 /
C DATA IMACH( 6) / 3 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 23 /
C DATA IMACH( 9) / 8388607 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 23 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 38 /
C DATA IMACH(15) / -127 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE HONEYWELL DPS 8/70 SERIES.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 43 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 36 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 35 /
C DATA IMACH( 9) / O377777777777 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 27 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 63 /
C DATA IMACH(15) / -127 /
C DATA IMACH(16) / 127 /, SANITY/987/
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 IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / Z7FFFFFFF /
C DATA IMACH(10) / 16 /
C DATA IMACH(11) / 6 /
C DATA IMACH(12) / -64 /
C DATA IMACH(13) / 63 /
C DATA IMACH(14) / 14 /
C DATA IMACH(15) / -64 /
C DATA IMACH(16) / 63 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE INTERDATA 8/32
C WITH THE UNIX SYSTEM FORTRAN 77 COMPILER.
C
C FOR THE INTERDATA FORTRAN VII COMPILER REPLACE
C THE Z'S SPECIFYING HEX CONSTANTS WITH Y'S.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 6 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / Z'7FFFFFFF' /
C DATA IMACH(10) / 16 /
C DATA IMACH(11) / 6 /
C DATA IMACH(12) / -64 /
C DATA IMACH(13) / 62 /
C DATA IMACH(14) / 14 /
C DATA IMACH(15) / -64 /
C DATA IMACH(16) / 62 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE PDP-10 (KA PROCESSOR).
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 36 /
C DATA IMACH( 6) / 5 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 35 /
C DATA IMACH( 9) / "377777777777 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 27 /
C DATA IMACH(12) / -128 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 54 /
C DATA IMACH(15) / -101 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE PDP-10 (KI PROCESSOR).
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 36 /
C DATA IMACH( 6) / 5 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 35 /
C DATA IMACH( 9) / "377777777777 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 27 /
C DATA IMACH(12) / -128 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 62 /
C DATA IMACH(15) / -128 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR PDP-11 FORTRANS SUPPORTING
C 32-BIT INTEGER ARITHMETIC.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / 2147483647 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 56 /
C DATA IMACH(15) / -127 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR PDP-11 FORTRANS SUPPORTING
C 16-BIT INTEGER ARITHMETIC.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 16 /
C DATA IMACH( 6) / 2 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 15 /
C DATA IMACH( 9) / 32767 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 56 /
C DATA IMACH(15) / -127 /
C DATA IMACH(16) / 127 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE PRIME 50 SERIES SYSTEMS
C WTIH 32-BIT INTEGERS AND 64V MODE INSTRUCTIONS,
C SUPPLIED BY IGOR BRAY.
C
C DATA IMACH( 1) / 1 /
C DATA IMACH( 2) / 1 /
C DATA IMACH( 3) / 2 /
C DATA IMACH( 4) / 1 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 4 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / :17777777777 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 23 /
C DATA IMACH(12) / -127 /
C DATA IMACH(13) / +127 /
C DATA IMACH(14) / 47 /
C DATA IMACH(15) / -32895 /
C DATA IMACH(16) / +32637 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE SEQUENT BALANCE 8000.
C
C DATA IMACH( 1) / 0 /
C DATA IMACH( 2) / 0 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 0 /
C DATA IMACH( 5) / 32 /
C DATA IMACH( 6) / 1 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 31 /
C DATA IMACH( 9) / 2147483647 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 24 /
C DATA IMACH(12) / -125 /
C DATA IMACH(13) / 128 /
C DATA IMACH(14) / 53 /
C DATA IMACH(15) / -1021 /
C DATA IMACH(16) / 1024 /, SANITY/987/
C
C MACHINE CONSTANTS FOR THE UNIVAC 1100 SERIES.
C
C NOTE THAT THE PUNCH UNIT, I1MACH(3), HAS BEEN SET TO 7
C WHICH IS APPROPRIATE FOR THE UNIVAC-FOR SYSTEM.
C IF YOU HAVE THE UNIVAC-FTN SYSTEM, SET IT TO 1.
C
C DATA IMACH( 1) / 5 /
C DATA IMACH( 2) / 6 /
C DATA IMACH( 3) / 7 /
C DATA IMACH( 4) / 6 /
C DATA IMACH( 5) / 36 /
C DATA IMACH( 6) / 6 /
C DATA IMACH( 7) / 2 /
C DATA IMACH( 8) / 35 /
C DATA IMACH( 9) / O377777777777 /
C DATA IMACH(10) / 2 /
C DATA IMACH(11) / 27 /
C DATA IMACH(12) / -128 /
C DATA IMACH(13) / 127 /
C DATA IMACH(14) / 60 /
C DATA IMACH(15) /-1024 /
C DATA IMACH(16) / 1023 /, SANITY/987/
C
C MACHINE CONSTANTS FOR VAX.
C
DATA IMACH( 1) / 5 /
DATA IMACH( 2) / 6 /
DATA IMACH( 3) / 7 /
DATA IMACH( 4) / 6 /
DATA IMACH( 5) / 32 /
DATA IMACH( 6) / 4 /
DATA IMACH( 7) / 2 /
DATA IMACH( 8) / 31 /
DATA IMACH( 9) / 2147483647 /
DATA IMACH(10) / 2 /
DATA IMACH(11) / 24 /
DATA IMACH(12) / -127 /
DATA IMACH(13) / 127 /
DATA IMACH(14) / 56 /
DATA IMACH(15) / -127 /
DATA IMACH(16) / 127 /, SANITY/987/
C
C *** ISSUE STOP 777 IF ALL DATA STATEMENTS ARE COMMENTED...
IF (SANITY .NE. 987) STOP 777
IF (I .LT. 1 .OR. I .GT. 16) GO TO 10
C
I1MACH = IMACH(I)
C/6S
C/7S
IF(I.EQ.6) I1MACH=1
C/
RETURN
10 WRITE(OUTPUT,1999) I
1999 FORMAT(' I1MACH - I OUT OF BOUNDS',I10)
CALL XSTOPX (' ')
I1MACH = 0
END
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