pfrsqrt

Packed Floating-Point Reciprocal Square Root

PFRSQRT mm, mm/m64

Approximates reciprocal sqrt (3DNow!).

Details

The Packed Floating-Point Reciprocal Square Root instruction approximates reciprocal sqrt (3DNow!).

Pseudocode Operation

// Approximates reciprocal sqrt (3DNow!)

Example

PFRSQRT mm, mm/m64

Encoding

Binary Layout
0F
+0
0F
+1
ModRM
+2
97
+3
 
Format 3DNow!
Opcode 0F 0F /r 97
Extension 3DNow!

Operands

  • dest
    64-bit MMX register
  • src
    64-bit MMX register or Memory operand