[llvm-dev] Not able to vectorize struct members

[Simon Pilgrim via llvm-dev]

I've reported this here: https://bugs.llvm.org/show_bug.cgi?id=51103

On 15/07/2021 04:04, Ryan Taylor via llvm-dev wrote:
> 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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