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I'm building a vector-parallelized Fortran code. Looking at hot spots and waits, I found that

x_sum=SUM(X) and

x_sum = zero

Do i 1,n

x_sum = x_sum + X(i)

ENDDO

X is a real.

preform differently. In my code the do-loop is ~30% faster. Note there are a number of summations involved so that reflects an overall result for a test case.

Must be my error but please point it out to me.

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Roman,

Program is BIG with a number of subroutines and why I didn't post. The SUMs in question are in the routine that handles much of the computations.

n ~ 12500

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