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Posted 14 Oct 2006

Using Inline Assembly in C/C++

, 14 Oct 2006 CPOL
This article describes using inline assembly code in your C/C++ program... was it ever difficult for you, it will never be any more!
 ```#include float sinx( float degree ) { float result, two_right_angles = 180.0f ; __asm__ __volatile__ ( "fld %1;" "fld %2;" "fldpi;" "fmul;" "fdiv;" "fsin;" "fstp %0;" : "=g" (result) : "g"(two_right_angles), "g" (degree) ) ; return result ; } float cosx( float degree ) { float result, two_right_angles = 180.0f, radians ; __asm__ __volatile__ ( "fld %1;" "fld %2;" "fldpi;" "fmul;" "fdiv;" "fstp %0;" : "=g" (radians) : "g"(two_right_angles), "g" (degree) ) ; __asm__ __volatile__ ( "fld %1;" "fcos;" "fstp %0;" : "=g" (result) : "g" (radians) ) ; return result ; } float square_root( float val ) { float result ; __asm__ __volatile__ ( "fld %1;" "fsqrt;" "fstp %0;" : "=g" (result) : "g" (val) ) ; return result ; } int main() { float theta ; printf( "Enter theta in degrees : " ) ; scanf( "%f", &theta ) ; printf( "sinx(%f) = %f\n", theta, sinx( theta ) ); printf( "cosx(%f) = %f\n", theta, cosx( theta ) ); printf( "square_root(%f) = %f\n", theta, square_root( theta ) ) ; return 0 ; } ```

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