Flow Control Instructions

call	Call subroutine	Calls a subroutine specified by a label.
callb	Boolean call	Calls a subroutine specified by a label if the Boolean register is the specified value.
callc	Condition call	Calls a subroutine specified by a label if the status register satisfies the specified condition.
jpb	Boolean jump	Jumps to the position of a specified label if the Boolean register is the specified value.
jpc	Condition jump	Jumps to the position of a specified label if the status register satisfies the specified condition.
ret	Return from subroutine	Returns to where the subroutine was invoked.
ifb	Start if block by boolean	Starts a control statement based on the contents of a Boolean register.
ifc	Start if block by condition	Starts a control statement based on the contents of a status register.
else	Start else block	Starts a control statement if the condition is not satisfied by `ifb` or `ifc`.
endif	End if block	Ends a control statement started by `ifb` or `ifc`.
loop	Start loop statement	Starts a loop control statement.
endloop	End loop statement	Ends a loop control statement.
breakc	Break from loop statement by condition	Forcibly ends loop control statement if the status register satisfies the specified condition.
cmp	Compare	Compares the contents of two registers and stores the result in a status register.
end	End process	Ends vertex shader processing.

Description