Export (0) Print
Expand All

rcp - vs

Computes the reciprocal of the source scalar.

Syntax

rcp dst, src

 

where

  • dst is the destination register.
  • src is a source register. Source register requires explicit use of replicate swizzle, that is, exactly one of the .x, .y, .z, .w swizzle components (or the .r, .g, .b, .a equivalents) must be specified.

Remarks

Vertex shader versions1_12_02_x2_sw3_03_sw
rcpxxxxxx

 

The following code fragment shows the operations performed.



float f = src0;
if(f == 0.0f)
{
    f = FLT_MAX;
}
else 
{
    if(f != 1.0)
    {
        f = 1/f;
    }
}

dest = f;


The output must be exactly 1.0 if the input is exactly 1.0. A source of 0.0 yields infinity.

Precision should be at least 1.0/(222) absolute error over the range (1.0, 2.0) because common implementations will separate mantissa and exponent.

If the source has no subscripts, the x-component is used.

 

 

Community Additions

ADD
Show:
© 2015 Microsoft