| /* { dg-do compile } */ |
| /* { dg-require-effective-target vect_double } */ |
| |
| double dotprod(const double *a, const double *b, unsigned long long n) |
| { |
| double d1 = 0.0; |
| double d2 = 0.0; |
| |
| for (unsigned long long i = 0; i < n; i += 2) { |
| d1 += a[i] * b[i]; |
| d2 += a[i + 1] * b[i + 1]; |
| } |
| |
| return (d1 + d2); |
| } |
| |
| /* We should use a SLP reduction even without -ffast-math by using a |
| VF of one. */ |
| /* { dg-final { scan-tree-dump "vectorizing stmts using SLP" "vect" { xfail vect_variable_length } } } */ |
| /* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" } } */ |
