4.9 Floating Point (Optional/Extra Credit)

4.9 Floating Point (Optional/Extra Credit)

4.9.1 Reading and Web Sites

1. Carter Chapter 6 Floating Point
2. Intel Vol 1 Page 8-1 Programming with the x87FPU
3. Intel Vol 1 Page 5-9 Section 5.2.
4. Intel Vol 1 Page 4-5 Section 4.2.2.

4.9.2 Notes

• Reverse polish arithmetic
• Floating point stack
• Floating point formats
• Printing floating point numbers  

  segment .data
  flt_fmt db      " %#16.8g",0
  segment .bss
  
  print_st0:             ; Print top of fp stack
      pusha
      pushf
      push  ebp          ; Save old bp
      mov   ebp,esp      ; New frame pointer    
      sub   esp,12       ; Space for call prams 
      fst   qword [esp+4]; Get 64 st(0) -> stack
      jmp   common
  
  print_fp:              ; Print EAX
      pusha
      pushf
      push  ebp          ; Save old bp
      mov   ebp,esp      ; New frame pointer
      sub   esp,12       ; Space for call prams
      mov   [esp+4], eax ; Put arg on stack/temp
      fld   dword [esp+4]; Put 32bit fp -> st(0)
      fstp  qword [esp+4]; Get 64 st(0) -> stack
  common:
      mov   dword [esp],flt_fmt 
                         ; Format string
      call  printf       ; call c with coerced value
      leave              ; pop frame
      popf
      popa
      ret
  

4.9.3 Lab Assignment, Floating Point

Write a program in assembly language that:

1. Prints your name, class (CIS250) and the date.
2. Print out "Floating Point"
3. Prints out the computed value of (2.3 * 4.7) + (2.5 / 9.6) .
4. Prints out the computed value sqrt(2.73195).
5. Prints out the computed value ln₂(your-student-services-number) Convert any "A"s to 4.

Turn in a printed error free listing and the output of your program. Include a copy of any testing that you did to verify the program was correct. If you don't do this I won't grade it!

4.9 Floating Point (Optional/Extra Credit)