callnz pred - vs

Call if not zero, with a predicate. 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:

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

Remarks

Vertex shader versions	1_1	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.
}

This instruction consumes one vertex shader instruction slot.