HP Fortran Programmer's Guide (B3908-90031; September 2011)

Compiling and linking
Compiling with the f90 command
Chapter 238
+fastallocatable
+fastallocatable enables a different representation for allocatable arrays in the
object code produced by the compiler. This alternate representation avoids problems in
optimizing code containing allocatable array references. Additionally, this alternate
representation for allocatable arrays is binary compatible with the old representation.
+fltconst_strict
Uses a strict power table for converting floating constants with exponents. Use of strict
power table provides a more accurate floating point representation.
+FPflags
+FP initializes the flags that specify how runtime floating-point exceptions should be
trapped; uppercase flags enable traps, lowercase flags disable traps. flags can be
concatenated to specify a desired behavior and may not contain spaces or tabs. Valid
values for flags are identified in Table 2-4.
By default, all traps are disabled. However, you can specifically disable a behavior
either by excluding the upper-case letter from flags or by including the equivalent
lower-case letter (v,z,o,u,i,d) in flags. For example, the following command lines
are equivalent:
$ f90 +FPvZI test.f90
$ f90 +FPZI test.f90
If you are using PA1.1 libraries, you can dynamically change these settings at run time
by using the fpsetdefaults or fpsetmask routines. For more information about
these routines, see the fpgetround(3M) man page and the
HP-UX Floating-Point Guide.