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hyunsik/sum_unrolled.c

Created April 3, 2013 18:44
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sum_unrolled.c
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sum_unrolled.c
int sum_unrolled( int n, int *a )
{
int sum = 0;
/* do the body of the work in a faster unrolled loop */
for( int i = 0; i < n/4*4; i += 4 )
{
sum += a[i+0];
sum += a[i+1];
sum += a[i+2];
sum += a[i+3];
}
/* handle the small tail in a usual way */
for( int i = n/4*4; i < n; i++ )
sum += a[i];
return sum;
}
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