callnz bool - ps

Call if not zero. Performs a conditional call to the instruction marked by the label index.

Syntax

callnz l#, [!]b#

Where:

l# is a label - ps marking the beginning of the subroutine to be called.
[!] is an optional negate modifier.
b# identifies a Constant Boolean Register.

Remarks

Pixel shader versions	1_1	1_2	1_3	1_4	2_0	2_x	2_sw	3_0	3_sw
callnz bool						x	x	x	x

This instruction does the following:

if (specified Boolean register is not zero)
{
    Push address of the next instruction to the return address stack
    Continue execution from the instruction marked by the label
}