Difference between revisions of "CSC231 Schedule 2012"

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* '''Wednesday''' <font color="magenta">'''Last Class'''</font>
 
* '''Wednesday''' <font color="magenta">'''Last Class'''</font>
 +
[[File:FloatingPointRangeByte.png|150px|right]]
 
** Answer to the question:  What does the ''real'' ligne looks like in terms of how the Floating Point format covers it?
 
** Answer to the question:  What does the ''real'' ligne looks like in terms of how the Floating Point format covers it?
 
** [[CSC231 Unexpected Floating-Point Results  | Examples of Floating Point programs that generate unexpected results]]
 
** [[CSC231 Unexpected Floating-Point Results  | Examples of Floating Point programs that generate unexpected results]]
 
** The architecture of the FPU: A stack of 8 80-bit registers: st0, st1, ... st7.
 
** The architecture of the FPU: A stack of 8 80-bit registers: st0, st1, ... st7.
−
** [[CSC231_An_Introduction_to_Fixed-_and_Floating-Point_Numbers#Programming_with_Floating-Point_Numbers_in_Assembly| Examples of assembly programs using the FPU]]
+
** [[CSC231_An_Introduction_to_Fixed-_and_Floating-Point_Numbers#Programming_with_Floating-Point_Numbers_in_Assembly| Examples of assembly programs using the FPU]] (also available [[CSC231 Floating-Point Assembly Examples| here]])
 
** How the FPU performs an addition of two floating point numbers
 
** How the FPU performs an addition of two floating point numbers
 
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Revision as of 10:51, 12 December 2012

--D. Thiebaut 11:15, 24 August 2012 (EDT)

Misc. Links & Information

Weekly Schedule

Week Topics Reading
Week 1
9/7


Week 2
9/10
  • Reading
Week 3
9/17

JacquardLoom.jpgJacquardLoom2.jpg

    • Get the list of all the assembly programs seen in class:
ls -ltr ~231a/handout
    • Get one of the files into your 231a-xx account:
getcopy movStrings1.asm
    • Or use sftp
sftp 231a-xx@beowulf.csc.smith.edu (and then use put filename or get filename to transfer files)
Week 4
9/24
  • Monday
    • Q&A
    • Solutions to HW #2 posted (see above).
    • The ADD instruction
int a = 3, b = 5, result = 0; 
result = a + b;
  • Reading
    • Sections 2.2, 2.2.1, 2.2.2, 2.2.3, and 2.2.4 in the Nasm Manual
    • Sections 3.1 to 3.2.1 in the Nasm Manual
    • The INC instruction.
Week 5
10/1
  • Monday
    • Review of two-bit Adder




  • Wednesday
  • Friday
    • Review of 2's Complement: Exercise in need of a solution...
    • Extending the sign from byte to word, or word to double-word.
      • CBW: The CBW (convert byte to word) instruction copies the sign (bit 7) in the source operand (AL) into every bit in the AH register.[1]
      • CWDE: The CWDE instruction copies the sign (bit 15) of the word in the AX register into every bit position of the high word of the EAX register[1].
    • Masking with AND, OR, and NOT, an example
CSC231StateDiagramForSoftwareProgram.png
Week 6
10/8
  • Monday: Fall Break
CSC231SummaryAddressingModes.png
  • Wednesday
    • Bitwise operators vs logical operators in Java. Example
    • More Addressing modes:
      • base/indirect
      • base/indirect with diplacement
      • base/inderect indexed
      • base/indirect indexed with displacement
    • The Loop instruction. Exercises with Loops
    • Fibonacci with loops and new addressing modes: Examples
  • Friday
Week 7
10/15
  • No homework assignment this week.
  • Reading
Week 8
10/22
  • Monday
    • Using a Makefile
    • Another trick. Keep the nasm, ld, and run commands in one line in your history:
nasm -f elf -F stabs myProg.asm ; ld -melf_i386 -o myProg myProg.o ; ./myProg
    • The Shift instructions
      • SHL, SHR, SAR, SAL
       shl     reg, 1
       shl     mem, 1
       shl     reg, imm         
       shl     mem, imm        
       shl     reg, cl
       shl     mem, cl
Week 9
10/29
Bad!!!
  • Reading
    • Functions and the topics associated with passing parameters are covered in Carter's Manual on Assembly Language, in Chapter 4, titled Subprograms.
Week 10
11/05
Move quickly!!!
  • Monday
    • Finish the top-down example
    • Review the actions of passing parameters through registers. The concept of functions returning values is directly implementable using registers (in most cases).
    • Using EBP to pass more than 4/6 dword parameters: 
int main() { 
   int a=3, b=5, res;
   res = sum( a, b );
   ...
}

int sum( int x, int y ) { 
   return x+y; 
}
  • Wednesday
    • review passing of value parameters through the stack
    • functions returning values...
  • Friday
    • Why is this code buggy?
    • local variables...
    • Some ideas for exercises
      • write a function that receives 3 dwords and returns the largest (in eax or in the stack)
      • write a function that receives a number and a char and prints a line with that many copies of it.
      • write a function that copies one array into another one.
      • write a function that receives two arrays: scans first one for patterns and updates second one as it does so.
  • Reading
    • Functions and the topics associated with passing parameters are covered in Carter's Manual on Assembly Language, in Chapter 4, titled Subprograms.
Week 11
11/12
For Lispers...
  • Monday
  • Wednesday
    • Some ideas for exercises
      • write a function that receives 3 dwords and returns the largest (in eax or in the stack)
      • write a function that receives a number and a char and prints a line with that many copies of it.
      • write a function that copies one array into another one. (we discovered a new instruction in the process: movsb)
      • write a function that receives two arrays: scans first one for patterns and updates second one as it does so.
      • write a function (in C, we would write it: swap( int *x, int *y) ) that swaps the values in x and y.
    • A look at the solution programs for Homework 8.
  • Friday
Week 12
11/19
  • Monday
    • Continuation of recursion. "Walking" the factorial example (see listing)
    • List of Factorials
    • Questions:
      • Any limiting factors?
      • Could we have computed the factorial any other way?
      • Unrolling recursion
    • Sketching the Towers of Hanoi problem in assembly...
  • Wednesday Thanksgiving Break
  • Friday Thanksgiving Break

Turkey.gif

Week 13
11/26
DontBeAChimp.png
BeMechanical.png
  • Monday
  • Wednesday
    • Q&A
    • Continuation with the Towers of Hanoi
      • Observe hanoi2.py and its indented output
      • Question 1: how much stack space is used when moving N disks?
      • Question 2: How large a number of disks can we move with a stack of 1000 bytes?
      • Question 3: Removing the tail recursion. How does it affect the stack?
    • Binary Search
    • What does the recursion tree look like for the Binary Search algorithm?
      • Would removing the tail recursion help Binary Search?
    • Printing an integer in decimal.
      • The DIV instruction
      • Sketching a solution
      • A program
      • Limitations of the program?
  • Friday: No Class
  • Reading
    • The DIV instruction is covered in Page 34 of Carter's book].
    • Recursion is still covered in Section 4.8 of Carter's text.
Week 14
12/03
Week 15
12/10
  • Wednesday Last Class
FloatingPointRangeByte.png





References

  1. ↑ 1.0 1.1 Intel Instruction Set Summary, from http://download.intel.com/design/processor/manuals/253666.pdf








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