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

Compiling and linking
Compiling with the f90 command
Chapter 2 29
5. Store the results from Step 4 into the location indicated by A(INDARR(I)) from
Step 1.
IVDEP directs the compiler to initially assume that when Steps 1 and 5 access a
common memory location, Step 1 always accesses the location first because Step 1
occurs earlier in the execution sequence. This approach lets the compiler reorder
instructions, as long as it chooses an instruction schedule that maintains the relative
order of the array references.
+allow_unaligned
Relaxes the natural data type rules for alignment.
+[no]asm
+asm compiles the named programs and leaves the assembler-language output in
corresponding files whose names have the .s extension. The assembler-language
output produced by this option is not supported as input to the assembler.
The default is +noasm.
The -S option can be used to perform the same function as +asm.
+[no]autodbl
+autodbl increases the default size of integer, logical, and real items to 8 bytes; see
Table 2-3. It also increases the default size of double precision and complex items to 16
bytes. This option does not increase the size of the following:
• Items of character type
• Items declared with the BYTE statement
• Items declared with the DOUBLE COMPLEX statement
• Explicitly sized items
For example, the following are unaffected by +autodbl:
INTEGER(KIND=4)
INTEGER(4) J
REAL*8 D
3.1416_4, 113_4
Note, however, that constants specified with an exponent—for example, 4.0E0 and
2.3D0—are doubled.