rcp - ps

Computes the reciprocal of the source scalar.


rcp dst, src



  • 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.


Pixel shader versions1_11_21_31_42_02_x2_sw3_03_sw


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

The scalar result is replicated to all channels in the destination write mask.

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.

Related topics

Pixel Shader Instructions