[llvm-dev] Vectorizing "hybrid" SOA

[Tom Chen via llvm-dev]

Do anyone know how to get LLVM's vectorizer to work on this code?
```
struct pair {
  int x[4], y[4];
};

void foo(int n, struct pair *a, int *restrict rx, int *restrict ry) {
  int x = 0, y = 0;
  for (int i = 0; i < n; i++) {
    x += (a+(i/4))->x[i%4];
    y += (a+(i/4))->y[i%4];
  }
  *rx = x;
  *ry = y;
}
```
I have a pass that converts structures such as {int, int} into {int x 4,
int x 4}, but the transformation is profitable if it can work with the
vectorizer.
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