Hi all,
A couple of years ago, working with OpenWatcom for Windows, I was
able to wrote the inline assembly code shown below. I spent a while
reading and by trail an error I made it work.
I was trying to test the efficiency of the "inner_product()" function
in C++.
Now I am working in Linux and I would like to compile it with g++.
Is the inline assembly of g++ similar?
Can some of this code be reused in g++?
I like to thank all of you in advance for your comments.
Edgar Black
+++++++++++++++++++++++++++++++++++++++++++++++++
double dot_product(double *array1, double *array1End, double *array2)
{
double result;
const unsigned int n = array1End-array1;
_asm {
fldz
mov ecx, n
cmp ecx,0
jz finish
mov esi,array1
mov edi,array2
more:
fld qword ptr [esi]
fmul qword ptr [edi]
faddp st(1),st(0)
add esi,8
add edi,8
loop more
finish:
fstp qword ptr result
} // end asm //
return (result);
} // end of dot_product//
+++++++++++++++++++++++++++++++++++++++++++++++++
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