[Liboil] Liboil slower than plain gcc?
r.schwebel at pengutronix.de
Sun Dec 16 04:46:41 PST 2007
On Sat, Dec 15, 2007 at 01:30:47PM -0500, Jason Sewall wrote:
> On Dec 15, 2007 1:18 PM, David Schleef <ds at schleef.org> wrote:
> > On Sat, Dec 15, 2007 at 01:08:51PM -0500, Jason Sewall wrote:
> > > it ends up being about 3-4x slower than gcc with this:
> > > for(int i = 0; i < size; ++i)
> > > dest[i] = c1*src1[i]+c2*src2[i];
> > >
> > > If they are compiled with:
> > > -DNDEBUG -O3 -funroll-all-loops -march=prescott --std=c99 -msse3 -mfpmath=sse
> > >
> > > Am I doing something grossly wrong?
> > Yes, you're assuming that someone has bothered to write optimizations
> > for that function.
> Got it. I'll stick with GCC.
Well, you could also write an optimization and provide a patch :-)
Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
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