double vs real

[Ali Çehreli]

On 05/31/2013 04:28 AM, Shriramana Sharma wrote:

 > On Fri, May 31, 2013 at 4:31 PM, Timon Gehr <timon.gehr at gmx.ch> wrote:
 >>
 >> If double uses xmm registers and real uses the fpu registers (as is 
standard
 >> on x64), then double multiplication has twice the throughput of real
 >> multiplication on recent intel microarchitectures.
 >
 > Hi can you clarify that? I'm interested because I'm running a 64 bit
 > system. What does twice the throughput mean? double is faster?

I am interested in the answer too. Meanwhile, can you run a test and see 
which type is faster on your system and then report here. :)

Thanks,
Ali