Mmx Instructions

|Taimur Hassan |March 19 |
| |2012 |
|01-133092-218, BCE-6(A) |ACA Assignment: 3 |

3D games: computations that duck 3D objects use 4-by-4 matrices that are multiplied with 4-element vectors many times. severally vector has the X,Y, Z and perspective disciplinal information for distributively pixel. The 4-by-4 matrix is used to rotate, scale, translate and update the perspective corrective information for each pixel.

Use the MMX instructions to demonstrate the reinforcement as a ratio

[pic]
Use the article on MMX technology to prove the following:

Solution:
MMX technology added 57 refreshed instructions on x86 architecture and allow SIMD operations on 64 bit registers.



In 3D games, 3D nontextual matter are achieved by vector dot product among matrices and vectors i.e. each 3D object is manipulated by 4x4 matrices that is multiplied by 4 element vectors. In the given example, we have vector with 4 elements: x, y, z, 1 which is multiplied by the 4x4 matrix.
[pic]
x=a0*x+a1*y+a2*z+a3
y=b0*x+b1*y+b2*z+b3
z=c0*x+c1*y+c2*z+c3
w=d0*x+d1*y+d2*z+d3
There will be quatern PM bring (Packed Word Multiply-Add) MMX instructions (calculated above) needed with MMX technology for all rows enchantment without MMX instruction, 16 instructions of MULTIPLY and 12 instructions of ADD were needed. The chart below shows the number of instruction execution compulsory with / without MMX instructions.
[pic]
(Chart of Number of instructions without / with MMX Technology)
So there is a meaningful difference if we use MMX technology. The ratio of advantage will be
28/72=0.3888
0.3888*100=38.88 percent
So with MMX technology, less than one half(prenominal) of number of instructions...If you want to get a full essay, stage it on our website: Orderessay



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