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From: Guillaume Foliard <guifo@wanadoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Benchmark Ada, please
Date: Sat, 05 Jul 2014 20:25:16 +0200
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Date: 2014-07-05T20:25:16+02:00
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Simon Wright wrote:
> Guillaume Foliard <guifo@wanadoo.fr> writes:
>> So the Ada version is significantly faster. I suppose it is mainly
>> because the Ada compiler has vectorized more loops than the C++ compiler
>> (add - ftree-vectorizer-verbose=2 to the above compilation commands to
>> check by yourself).
> 
> On Mac OS X (2.5 GHz Intel Core i5) I found the reverse, both with FSF
> GCC 4.9.0 and GNAT GPL 2014; C++ took ~ 1s, Ada took ~ 2s.
> 
> With GCC 4.9.0, gfortran was approximately the same as C++.
> 
> Apple's C++ (Xcode 5.1.1) was approximately the same as GCC's.
> 
> -ftree-vectorizer-verbose=2 had no effect with FSF GCC.

That's strange, here are my results with GCC FSF 4.9.0:

C++:
Elapsed time is   = 3.09426

Ada:
Elapsed time is = 2.111398804

C++ improved a bit, while Ada degraded, still outperforming C++.

Indeed under GCC FSF 4.9.0 the -ftree-vectorizer-verbose does not output any 
messages anymore. I have no clue why.

-- 
Guillaume Foliard