1. Ubiquitous Presenter http://up.ucsd.edu
Beth Simon
William Griswold
and the UCSD UP development team

2. Addressing Modes how do we specify the operand we want?
Immediate
#25
The operand (25) is part of the instruction
R (sometimes written $3)
The operand is the contents of register 3
M[R3]
Use contents of R3 as address into memory; find the operand there. This is a special case of...
M[R ]
Add the displacement (160) to contents of R3, look in that memory location for the operand
If register is PC, this is “PC-relative addressing”
All our example ISA’s have the above modes
Register (direct)
Register (indirect)
Base+Displacement
One other used for jumps, in the book
psuedodirect

3. How do we achieve increased performance? (Gene) Amdahl’s Law
IBM
The impact of an improvement is limited by the fraction of time affected by the improvement.
If you make MMX instructions run 10 times as fast, a program which doesn’t use MMX instructions will not run faster.
ETnew = ETold affected/amount of improve + ETold unaffected
ETnew = 0sec/ sec  ET new = 100sec
Etnew = 50sec/ sec  Etnew = 5+50 = 55

4. SPEC on Pentium III and Pentium 4
SSE2 info from John Seng - Jan 2003
--doubling the GHz doesn’t double the SPEC number
--Bigger imporvement on P4 on FP
SSE2 instruction set – stack registers to regular FP register set
Had to recompile to use these instruction sets
What do you notice?

5. Which of these things is not like the other?
Mention
Sesame Street B A D C
Why?

6. Label the following 3 things:
Epidermis
Dermis
Fat Cells

7. What are the top 3 places you most want to visit?
What are the top 3 places you least want to visit?