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vactorization in gcc


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.


		
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