[llvm-dev] Not able to vectorize struct members

[Ryan Taylor via llvm-dev]

Given a test case:

#define N 10
struct foo {
  float a[N][N];
  float b[N];
};

void compute(struct foo *p)
{
  for (int i = 0; i < N; i++) {
    for (int j = 0; j < N; j++) {
      p->a[i][j] += 0.1f * p->b[i];
    }
  }
}

LLVM isn't able to vectorize this code. I'm not sure what the issue is here
as it seems to vectorize this code:

#define N 10
struct foo {
  float a[N];
  float b[N];
};

void compute(struct foo *p)
{
  for (int i = 0; i < N; i++) {
      p->a[i] += 0.1f * p->b[i];
  }
}

Is this a known issue?

-Ryan
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