4.8 Floating Point (Optional/Extra Credit)

4.8 Floating Point (Optional/Extra Credit)

4.8.1 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.

4.8.2 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
  

4.8.3 Lab Assignment, Floating Point

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!

4.8 Floating Point (Optional/Extra Credit)