Specifies the use of instruction scheduling optimization.
#pragma schedule once | twice | altivec | off
This pragma lets you choose how many times the compiler passes object code through its instruction scheduler.
On highly optimized C code where loops were manually unrolled, running the scheduler once seems to give better results than running it twice, especially in functions that use the register specifier.
When the scheduler is run twice, it is run both before and after register colorizing. If it is only run once, it is only run after register colorizing.
This pragma does not correspond to any panel setting. The default value for this pragma is twice .