Enhanced 3DNow! Instruction Set Architecture (ISA) Extension

Enhanced 3DNow! instructions added with the Athlon processors:

• PI2FW
  Packed Integer to Floating-Point Word Conversion
• PFNACC
  Packed Floating-Point Negative Accumulate
• PFPNACC
  Packed Floating-Point Positive-Negative Accumulate
• PF2IW
  Packed Floating-Point to Integer Word Conversion
• PSWAPD
  Packed Swap Doubleword

Geode specific extensions:

• PFRSQRTV
  Reciprocal Square Root Approximation for a Pair of 32-bit Floats
• PFRCPV
  Reciprocal Approximation for a Pair of 32-bit Floats