Hi,
I run some tests of simple number-crunching loops whenever new
architectures and compilers arise.
These tests on recent Intel architectures show similar performance
between gcc and icc compilers, at full optimization.
However a recent test on x86_64 showed the open64 compiler
outstripping gc
Hi Richard!
On Thu, Sep 8, 2011 at 11:02 AM, Richard Guenther
wrote:
> On Thu, Sep 8, 2011 at 12:31 AM, Steve White
> wrote:
>> Hi,
>>
>> I run some tests of simple number-crunching loops whenever new
>> architectures and compilers arise.
>>
>> Thes
Hi!
This concerns multiple character integer constants, e.g.
'abcd'
as discussed in the C99 standard in subsection 6.4.4.4.
We'll call them "multichars".
First: everybody agrees multichars are non-portable and therefore to
be avoided.
That said, there are real-life situations where they
#108.2
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ay be doing.
Why is the SSE2 division so slow, compared to multiplication?
Change one character in the division test to make a multiplication test.
It is an order of magnitude difference in speed.
Try it yourself!
Thanks!
On 23.01.10, Andrew Pinski wrote:
> On Sat, Jan 23, 2010 at 8:47 AM, Ste
cycle (although I knew there
are various other issues.)
Cheers!
On 23.01.10, Richard Guenther wrote:
> On Sat, Jan 23, 2010 at 6:33 PM, Steve White wrote:
> > Hi, Andrew!
> >
...
> >
> > Nevermind icc for the moment, with whatever trick it may be doing.
> > Why is
