SGI Compiler Roundoff Control
The -OPT:roundoff=n option specifies how strictly the compiler must adhere to coding order semantics:
- 0 requires strict compliance with programmed sequence, inhibiting most loop optimizations
- 1 allows simple reordering within expressions
- 2 allows extensive reordering such as loop unrolling
- 3 allows any algebraically valid transformation (default with -Ofast is used)