callnz pred - ps

Call with a predicate, if not zero. Performs a conditional call to the instruction marked by the label index. Predication uses a Boolean value to determine whether of not to perform the instruction.

Syntax

callnz l#, [!]p0.{x\|y\|z\|w}

Where:

where l# is a label - ps marking the beginning of the subroutine to be called.
[!] is an optional negate modifier.
p0 is the predicate register. See Predicate Register.
{x|y|z|w} is the required replicate swizzle on p0.

Remarks

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

This instruction does the following:

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