Nikhil Musham gave a technical seminar on Intel's MMX technology for enhancing processor performance. MMX utilizes SIMD parallelism and packed data types to accelerate multimedia and communications applications while maintaining compatibility. It includes new packed data types, an enhanced instruction set with arithmetic, comparison, conversion and other operations, and eight new 64-bit MMX registers. MMX provides significant performance improvements over non-MMX code for tasks like chroma keying through parallel execution and reduced instructions.

1. A
TECHNICAL SEMINAR
ON
INTEL’S MMX TECHNOLOGY
FOR ENHANCED PROCESSOR
PERFORMANCE
--BY
NIKHIL
MUSHAM

2. INTRODUCTION


Intel’s MMX technology is designed to
accelerate multimedia and communications
applications.
It exploits the parallelism & maintains full
compatibility with existing operating systems
and applications.

3. 
The basis is Single Instruction, Multiple Data
(SIMD).

4. 
The technology includes:
 Four
new packed data types
 Enhanced Instruction Set
 Eight 64-bit wide MMX registers
 Compatibility

5. DATA TYPES

6. COMPATABILITY


No new registers or states are added to
support MMX technology.
Aliases to existing FP registers.

7. Fig :- MMX Register Set

8. INSTRUCTIONS

The MMX instructions cover several functional
areas including:
 Basic
arithmetic
 Comparison
 Conversion: pack & unpack
 Logical Operations
 Shift Operations
 Move: register-to-register
 Load/Store

9. Packed Add Word
•Each Addition is independent
•Rightmost overflows and wraps around

10. Example: Packed Add
Hexadecimal
Binary
FFFFh
1111 1111 1111 1111
8000h
1000 0000 0000 0000
7FFFh
0111 1111 1111 1111

11. Packed Parallel Compare

12. Pack/Unpack
Pack:

13. UnPack:
•Unpack low words into doublewords
b3 b2 b1 b0
a3 a2 a1 a0
b1 a1
b0 a0

14. APPLICATION EXAMPLES

15. 1.Conditional Select

Chroma Keying example:
 It
demonstrates how conditional selection using
the MMX instruction set removes branch mispredictions, in addition to performing multiple
selection operations in parallel.

16. Create Mask
Assume pixels alternate green/not_green

17. Combine: !AND, AND, OR

18. Compare
Load
Multiply
Add
Misc
Store
Total
W/O MMX
32
16
12
8
4
72
WITH MMX
6
4
2
12
4
28
• MMX required less than one half the instructions.

19. CONCLUSION
•
•
The Intel MMX technology comprises a set of
instructions that are combined with SIMD
execution model to accelerate the
performance of applications such as motion
video, combined graphics with video, image
processing,2D and 3D graphics etc.
All existing softwares that don’t make use of
this technology will also run on the processor
without
modification.