fpt Reference: Check for Cumulated Integer Overflow

fpt and WinFPT Reference Manual - Command-line Commands

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CHECK FOR CUMULATED INTEGER OVERFLOW

Syntax:

[DO NOT] CHECK FOR CUMULATED INTEGER OVERFLOW [DO NOT] CHECK FOR CUMULATIVE INTEGER OVERFLOW

Function:

fpt checks for situations where integer arithmetic may cause overflow. The most dangerous situations occur when one or two byte integers are constructed from longer integers, or when integers are generated from the results of real arithmetic.

The authors have seen many situations where integers wrap to negative values instead of generating a run-time exception.

Where to Use this Command

Operating system command line	Yes
Configuration file, config.fsp	Yes
Specification (fsp) files, *.fsp	Yes
Interactively, to FPT> prompt	No
Interactive command files	No
Embedded in the Fortran code	Yes

Default

The check is not made by default. It may produce a large number of false positives.

(Note that defaults may be changed in the configuration file)