Enabling automatic parallelization

The compiler can automatically locate and parallelize all countable loops where possible in your program code. A loop is considered to be countable if it has any of the forms shown in Countable loops, and:

• There is no branching into or out of the loop.
• The increment_expression is not within a critical section.

In general, a countable loop is automatically parallelized only if all of the following conditions are met:

• The order in which loop iterations start or end does not affect the results of the program.
• The loop does not contain I/O operations.
• Floating point reductions inside the loop are not affected by round-off error, unless the -qnostrict option is in effect.
• The -qnostrict_induction compiler option is in effect.
• The -qsmp=auto compiler option is in effect.