rsq - ps

Computes the reciprocal square root (positive only) of the source scalar.

Syntax

rsq 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

Pixel shader versions1_11_21_31_42_02_x2_sw3_03_sw
rsqxxxxx

 

The absolute value is taken before processing.

Precision should be at least 1.0/(222) absolute error over the range (1.0, 4.0) because common implementations will separate mantissa and exponent.

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

 

 

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