[Bug tree-optimization/95839] New: Failure to optimize addition of vector elements to vector addition

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95839

            Bug ID: 95839
           Summary: Failure to optimize addition of vector elements to
                    vector addition
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gabravier at gmail dot com
  Target Milestone: ---

typedef float __attribute__((vector_size(8))) v2f32;

v2f32 f(v2f32 a, v2f32 b)
{
    return (v2f32){a[0] + b[0], a[1] + b[1]};
}

This can be optimized to `return a + b;`. This transformation is done by LLVM,
but not by GCC.