ifb - Start if block by boolean

ifb     src

Name	Description
src	A Boolean register.

Executes conditional processing based on the contents of the Boolean register specified by src.
When it is true, the instructions between ifb and endif are executed. If there is an else instruction between ifb and endif, the instructions between ifb and else are executed.
When it is false, the instructions between ifb and endif are skipped and control moves to the instruction immediately after endif. If there is an else instruction between ifb and endif, the instructions between else and endif are executed.
This instruction must be followed by an endif instruction.

You can nest a combined total of up to eight ifb and ifc instructions.

You must include at least one instruction between ifb and endif as well as between ifb and else.

if ( src == true )
{
    ...
}

ifb     b0
    ...
endif

2011/12/20

Initial version.