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Hardware-Specific Topics > Sun Studio: Using VIS Instructions to Speed Up Key R...

Sun Studio: Using VIS Instructions to Speed Up Key Routines

Darryl Gove, Geetha Vallabhaneni, January 5, 2006

Introduction

The VIS instruction set includes a number of instructions that can be used to handle several items of data at the same time. These are called SIMD (Single Instruction Multiple Data) instructions. The VIS instructions work on data held in floating-point registers. The floating-point registers are 8-bytes in size, and the VIS instructions can operate on them as two 4–byte ints, four 2–byte shorts, or eight 1-byte chars, as shown in the following figure.


  

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