vactorization in gcc

[Tim Prince]

ranjith kumar wrote:
> Hi,
>  I have read about SIMD(SSE,SSE2....) features of
> Pentium 4.
>  I know that one can write code to explioit such a
> feature by using functions in <xmmintrin.h>.....
> 
> Given a C program which does not exploit SIMD feature,
> but can be modified to  exploit such a feature, can 
> GCC   optimizer modifies the code to exploit it???
> 
> Please send any source to know more about this.
> Thanks in advance.
With so much material on this subject readily available (do you have a 
search engine, or access to gcc.gnu.org?), I can't guess what specific 
question you have in mind.  Did you have trouble spelling the 
terminology, e.g. auto-vectorization?