On Thu, Apr 2, 2015 at 3:19 AM, Edward Nevill wrote:
> Looking at the disassembly I see it is using FP registers to hold
> integer values. The following is a small extract.
-O3 turns on -finline-functions, which causes a lot of code expansion.
That, combined with the fact that we end up with a ca
Hi,
I did some tests on the following function
--- CUT HERE ---
int fibo(int n)
{
if (n < 2) return 1;
return (fibo(n-2) + fibo(n-1));
}
--- CUT HERE ---
and I discovered that it is faster -O2 than -O3. This is with gcc 4.9.2.
Looking at the disassembly I see it is using FP registers to hol
