有关汇编的文章与代码

;浮点型指令编程--计算平方和的平方根程序
;find the square root of the sum of the squares of two floating point numbers
;Author:lionel.shen
;Date:revised 10/2009

.386
.MODEL FLAT
ExitProcess PROTO NEAR32 stdcall,dwExitCode:DWORD

.STACK 4096

.DATA
value1 REAL4  0.5
value2 REAL4  1.2
sqrt   REAL4  ?

.CODE
_start:
  finit            ;initialize floating point unit
  fld      value1  ;value1 in ST    实现从存储器复制value1值给ST
  fld      st      ;value1 in ST and ST(1)  把value从ST复制给ST,并把第一个堆栈的值下移到ST(1)
  fmul             ;value1*value1 in ST  在ST中计算value1*value1的值,同时ST(1)的值“清空“
  fld      value2  ;value1 in ST(value1*value1 in ST(1))
  fld      st      ;value2 in ST and ST(1)
  fmul             ;value2*value2 in ST
  fadd             ;sum of squares in ST
  fsqrt            ;square root of sum of squares in ST
  fstp     sqrt    ;store result,clearing stack
  
  
  INVOKE ExitProcess,0
  
PUBLIC _start
END

//个人所添注释
finit指令确保FPU寄存器的内容能被清空