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c i1mach from portlib 03/25/82
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 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.
c
integer imach(16),output
c
equivalence (imach(4),output)
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 /
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 /
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 /
c
c machine constants for 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) / 48 /
c data imach(12) / -974 /
c data imach(13) / 1070 /
c data imach(14) / 96 /
c data imach(15) / -927 /
c data imach(16) / 1070 /
c
c machine constants for the cray 1
c
c data imach( 1) / 100 /
c data imach( 2) / 101 /
c data imach( 3) / 102 /
c data imach( 4) / 101 /
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) / 48 /
c data imach(12) / -8192 /
c data imach(13) / 8191 /
c data imach(14) / 96 /
c data imach(15) / -8192 /
c data imach(16) / 8191 /
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 /
c
c machine constants for the harris 220
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 /
c
c machine constants for the honeywell 600/6000 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) / 6 /
c data imach( 7) / 2 /
c data imach( 8) / 35 /
c data imach( 9) / 0377777777777 /
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 /
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 /
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) / 5 /
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 /
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) / 5 /
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 /
c
c machine constants for pdp-11 fortran"s supporting
c 32-bit integer arithmetic.
c
c data imach( 1) / 5 /
c data imach( 2) / 6 /
c data imach( 3) / 5 /
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 /
c
c machine constants for pdp-11 fortran"s supporting
c 16-bit integer arithmetic.
c
c data imach( 1) / 5 /
c data imach( 2) / 6 /
c data imach( 3) / 5 /
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 /
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 /
c
c machine constants for IEEE binary floating point standard
c
data imach( 1) / 5 /
data imach( 2) / 6 /
data imach( 3) / 5 /
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) / -128 /
data imach(13) / 127 /
data imach(14) / 53 /
data imach(15) / -1023 /
data imach(16) / 1024 /
c
c-----------------------------------------------------------------------
c delete next two statements after supplying the proper data statements.
c data imach (5) /0/
c if (imach(5) .eq. 0)
c 1call uliber(2,45h i1mach - machine dependent constants not set,45)
c-----------------------------------------------------------------------
c if (i .lt. 1 .or. i .gt. 16) go to 10
c
i1mach=imach(i)
return
c
c 10 call uliber(1,34h error in i1mach - i out of bounds,34)
c
c stop
c
end
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