On 11/19/2012 02:37 PM, Pedro Lopez-Cabanillas wrote:
On Mon, Nov 19, 2012 at 1:05 PM, David Henningsson <di...@ubuntu.com
<mailto:di...@ubuntu.com>> wrote:
Given that floats are faster on ARM devices (and probably older x86
devices as well), I think it makes sense to switch back to using
single point precision by default.
I don't really care too much.
Ok, I'll change the default to float then.
Automatic denormals to zero doesn't prevent FP operations being
slower when
such numbers are involved. The problem is the larger CPU usage
if there are FP
exceptions, which happens in all CPUs except modern Intel
processors.
I'm trying to verify this theory,
I'm not sure which part you don't buy: that there are still some
problems with denormals or other FP exceptions in the DSP code? or that
denormals are a problem in most architectures? The former is pretty
easy: the FPE check build option as I suggested. The latter is pretty
well documented on the Net, I think.
I'm not convinced that this is a relevant performance hit. This could be
either because denormal and/or FPU exception handling is not being so
slow whenever this happens, or whether we don't get this often enough
for it to relevant.
// David
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