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Using and Porting GNU Fortran

14.6 Faster Programs

Aside from the usual gcc options, such as `-O', `-ffast-math', and so on, consider trying some of the following approaches to speed up your program (once you get it working).

14.6.1 Aligned Data
14.6.2 Prefer Automatic Uninitialized Variables
14.6.3 Avoid f2c Compatibility
14.6.4 Use Submodel Options