D30V-Opts - Using as

The Mitsubishi D30V version of as has a few machine dependent options.

‘-O’: The D30V can often execute two sub-instructions in parallel. When this option is used, as will attempt to optimize its output by detecting when instructions can be executed in parallel.
‘-n’: When this option is used, as will issue a warning every time it adds a nop instruction.
‘-N’: When this option is used, as will issue a warning if it needs to insert a nop after a 32-bit multiply before a load or 16-bit multiply instruction.