Chapter 12. Floating-Point Vector Addition and Subtraction
The topic of floating-point was discussed back in Chapter 8, "Floating-Point Anyone?" As the same methodologies of SIMD processing learned in Chapter 7, "Integer Math," apply for packed floating-point, it does not matter whether one is calculating the sum or the product. However, there is one exception. With integer addition, the data width increases by one bit. With integer multiplication, the data width increases by 2N bits. With floating-point, the number occupies the same number of bits. So with that said, let's jump right into packed floating-point addition.
The samples are actually three different types of examples: a standard single data element solution; a 3D value, typically an ...
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