| /* { dg-do compile } */ | |
| /* { dg-options "-O -ftree-loop-vectorize -fdump-tree-vect-details -fno-tree-loop-im -mavx2 -mprefer-vector-width=256" } */ | |
| double x[1024][1024], red[1024]; | |
| void foo (void) | |
| { | |
| for (int i = 0; i < 1024; ++i) | |
| for (int j = 0; j < 1024; ++j) | |
| { | |
| double v = i == 0 ? 0.0 : red[j]; | |
| v = v + x[i][j]; | |
| red[j] = v; | |
| } | |
| } | |
| /* { dg-final { scan-tree-dump "vectorization factor = 4" "vect" } } */ |