Re: [Bug-gsl] gsl_vector_get / set

[Brian Gough]

At Fri, 28 Nov 2008 11:26:49 +0100,
geist_mat wrote:
> 
> Hi,
> 
> Trying to optimize some code, i remarked that calling the gsl_vector_get
> function was much more slower than just accessing the structure with
> something like v->data[i*v->stride], and the same seems to hold for
> gsl_vector_set. On my program, it is about 15 time faster, however here
> is a simpler example.

Hello,

Have you checked the preprocessor output 'g++ -E ...' to make sure the
inline version of the function is being imported correctly?  I tried
the program and get the same speed in each case as would be expected.

-- 
Brian Gough

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$ g++ -Wall -O3 -DMANUAL -I ~/gsl -g inline.c  ~/gsl/.libs/libgsl.a  
(14:36)$ time ./a.out
0

real    0m2.795s
user    0m2.771s
sys     0m0.005s
(14:36)$ 

(14:36)$ g++ -Wall -O3 -DHAVE_INLINE -I ~/gsl -g inline.c  ~/gsl/.libs/libgsl.a 
 
(14:36)$ time ./a.out
0

real    0m2.797s
user    0m2.771s
sys     0m0.003s