The Inline Assembler

Now, it is time to describe the inline assembler. This is a powerful tool. You should only bear in mind that contemporary inline assemblers often provide limited capabilities in relation to support of new microprocessor commands. This is natural, because the development of a new version of developer tools, such as C++ Builder, requires considerably more time than the development of TASM. In the examples provided in Listings 20.9 and 20.10, coprocessor commands are used.

Listing 20.9: Using the ASM directive and coprocessor commands in a Pascal program

 program Project2; {$APPTYPE CONSOLE} uses     SysUtils; var     d:double; function soproc(f:double): double; var res:double; begin     asm         FLD f         FSIN         FSTP res     end;     soproc:=res ; end; begin     d:=-pi;     while (d<=pi) do     begin         writeln(d:10:2, '-', soproc(d):10:2);         d:=d+0.1;     end; end. 

 

Listing 20.10: Using the ASM directive and coprocessor commands in a C program (Borland C++ 5.0)

 #include <windows.h> #include <stdio.h> double soproc(double f); void main() {         double w = -3.14;         while(w<=3.14)         {                 printf("%f- %f\n", w, soproc(w));                 w = w + 0.1;         }         ExitProcess (0); } double soproc (double f) {         double d;         asm         {                 FLD f                 FSIN                 FSTP d         }         return d; }