50 lines
1.6 KiB
Fortran
50 lines
1.6 KiB
Fortran
subroutine cw87
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* CW87.FOR
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* This subroutine uses the C Library routine "_control87"
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* to modify the math coprocessor exception mask.
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* Compile: wfc[386] cw87
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include 'fsignal.fi'
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character*9 status(0:1)/' disabled',' enabled'/
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integer fp_cw, fp_mask, bits, i
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* Enable floating-point underflow since default is disabled.
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* The mask defines which bits we want to change (1 means change,
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* 0 means do not change). The corresponding bit in the control
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* word (fp_cw) is set to 0 to enable the exception or 1 to disable
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* the exception. In this example, we change only the underflow
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* bit and leave the others unchanged.
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fp_mask = EM_UNDERFLOW ! mask for the bits to set/reset
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fp_cw = '0000'x ! new bit settings (0=enable/1=disable)
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fp_cw = _control87( fp_cw, fp_mask )
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* Now get up-to-date setting
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fp_cw = _control87( 0, 0 )
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bits = IAND( fp_cw, MCW_EM )
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print '(a,1x,z4)', 'Interrupt Exception Mask', bits
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i = 0
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if( IAND(fp_cw, EM_INVALID) .eq. 0 ) i = 1
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print *, ' Invalid Operation exception', status(i)
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i = 0
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if( IAND(fp_cw, EM_DENORMAL) .eq. 0 ) i = 1
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print *, ' Denormalized exception', status(i)
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i = 0
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if( IAND(fp_cw, EM_ZERODIVIDE) .eq. 0 ) i = 1
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print *, ' Divide-By-Zero exception', status(i)
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i = 0
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if( IAND(fp_cw, EM_OVERFLOW) .eq. 0 ) i = 1
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print *, ' Overflow exception', status(i)
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i = 0
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if( IAND(fp_cw, EM_UNDERFLOW) .eq. 0 ) i = 1
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print *, ' Underflow exception', status(i)
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i = 0
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if( IAND(fp_cw, EM_PRECISION) .eq. 0 ) i = 1
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print *, ' Precision exception', status(i)
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end
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