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Using and Porting GNU Fortran

15.3.26 Bit Operations on Floating-point Data

g77 does not allow REAL and other non-integral types for arguments to intrinsics like And, Or, and Shift.

For example, this program is rejected by g77, because the intrinsic Iand does not accept REAL arguments:

DATA A/7.54/, B/9.112/ PRINT *, IAND(A, B) END