HP Fortran Programmer's Guide (September 2007)

Compiling and linking

Compiling with the f90 command

Chapter 2 45

2 Optimizations performed at level 1, plus the following:

• Coloring register allocation

• Induction variables and strength reduction

• Common subexpression elimination

• Loop invariant code motion

• Store/copy optimization

• Unused deﬁnition elimination

• Dataﬂow analysis

• Software pipelining

• Scalar replacement

• Sum reduction optimization

3 Optimizations performed at levels 1 and 2, plus the

following:

• Interprocedural optimizations, including cloning and

inlining

• Loop transformations to improve memory performance,

including fusion and interchange

Table 2-6 Levels of optimization (Continued)

Level Optimizations