IntelÂ® Fortran Libraries Reference

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2 Intel Fortran Libraries Referenceiflag = ieee_flags('set', 'direction', 'tozero', out)The following example sets the rounding direction to the default ('nearest'):USE IFPORTINTEGER*4 iflagCHARACTER*1 out, iniflag = ieee_flags('clear','direction', '', '' )The following example clears all exceptions:USE IFPORTINTEGER*4 iflagCHARACTER*10 outiflag = ieee_flags('clear','exception', 'all', '' )The following example restores default direction and precision settings, and sets all exceptionflags to 0:USE IFPORTINTEGER*4 iflagCHARACTER*10 mode, out, iniflag = ieee_flags('clearall', '', '', '')The following example detects an underflow exception:USE IFPORTCHARACTER*20 out, inexcep_detect = ieee_flags('get', 'exception', 'underflow', out)if (out .eq.'underflow') stop 'underflow'IEEE_HANDLERPortability Function: Establishes a handler for IEEE exceptions.Module: USE IFPORTSyntaxresult = IEEE_HANDLER (action, exception, handler)action(Input) Character*(*). One of the following IEEE actions: 'GET', 'SET', or 'CLEAR'. For moredetails on these actions, see IEEE_FLAGS.2-168
Descriptions of the Library Routines 2exception(Input) Character*(*). One of the following IEEE exception flags: 'inexact', 'underflow','overflow', 'division', 'invalid', 'all' (which equals the previous five flags), or 'common' (whichequals 'invalid', 'overflow', 'underflow', and 'division'). The flags 'all' or 'common' should only beused for actions SET or CLEAR. For more details on these flags, see IEEE_FLAGS.handler(Input) The address of an external signal-handling routine.Results:The result type is INTEGER(4) on IA-32 processors; INTEGER(8) on Intel Itanium processors.The result is 0 if successful; otherwise, 1.IEEE_HANDLER calls a signal-handling routine to establish a handler for IEEE exceptions. Italso enables an FPU trap corresponding to the required exception.The state of the FPU is not defined in the handler routine. When the FPU trap occurs, the programinvokes the handler routine. After the handler routine is executed, the program terminates.The handler routine gets the exception code in the SIGINFO argument. SIGNO is the number ofthe system signal. The meaning of the SIGINFO constants appear in the following table (definedin the IFPORT module):FPE$INVALIDFPE$ZERODIVIDEFPE$OVERFLOWFPE$UNDERFLOWFPE$INEXACTInvalid operationDivide-by-zeroNumeric overflowNumeric underflowInexact result (precision)'GET' returns the location of the current handler routine for exception cast to anINTEGER.See Also: “IEEE_FLAGS”ExampleThe following example creates a handler routine and sets it to trap divide-by-zero:PROGRAM TEST_IEEEREAL :: X, Y, ZCALL FPE_SETUPX = 0.Y = 1.Z = Y / X2-169
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