Hello,
I am trying to get gcc to optimize an inner math loop. The first part
of the loop computes a single precision float expression (which may or
may not be NAN), and the second part sums all of these results into a
double precision total:
Conceptually, the code is:
double sum = 0;
for(i=0;
Michael James wrote:
Conceptually, the code is:
double sum = 0;
for(i=0; in; ++i) {
float x = ..computed..;
sum += isnan(x)? 0: x;
}
I have tried a half dozen variants at the source level in attempt to
get gcc to do this without branching (and without calling a helper
function
