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9.9.1 D10V Options

The Mitsubishi D10V version of as has a few machine dependent options.

‘-O’
The D10V 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.
‘--nowarnswap’
To optimize execution performance, as will sometimes swap the order of instructions. Normally this generates a warning. When this option is used, no warning will be generated when instructions are swapped.
‘--gstabs-packing’
‘--no-gstabs-packing’
as packs adjacent short instructions into a single packed instruction. ‘--no-gstabs-packing’ turns instruction packing off if ‘--gstabs’ is specified as well; ‘--gstabs-packing’ (the default) turns instruction packing on even when ‘--gstabs’ is specified.