6.3.8 C*$* scalar optimize (0-3 )

The C*$* scalar optimize directive sets the level of dusty-deck and other serial transformations performed. Unlike the /scalaropt command-line qualifier, the C*$* scalar optimize directive sets the level of loop-based optimizations (for example, loop fusion) only, and not straight-code optimizations (for example, dead-code elimination).

The following table shows the meaning of each scalar optimize level.
Value  Meaning 
0   No transformations are performed. 
1   IF loops are changed into DO loops. Simple code floating out of loops is performed. Forward substitution of variables is performed. 
2   The full set of loop-based serial transformations is enabled. These include induction variable recognition, loop rerolling, loop unrolling, loop fusion, and array expansion. 
3   Memory management is enabled, if /roundoff=3


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