[llvm-bugs] [Bug 46902] New: Accessing element of struct prevents vectorization

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46902

            Bug ID: 46902
           Summary: Accessing element of struct prevents vectorization
           Product: tools
           Version: trunk
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: opt
          Assignee: unassignedbugs at nondot.org
          Reporter: joel.hutton at arm.com
                CC: llvm-bugs at lists.llvm.org

The following snippet:

include <stdint.h>$

struct foo;$
typedef struct foo {$
  int x;$
} foo;$
$
void bar(unsigned char dst, unsigned char src,$
         foo *f, int i_max) {$
    for (int i = 0; i < i_max; i++)$
      dst[i] = (src[i] + f->x);$
}$

cannot be vectorized by LLVM trunk. However, if f->x is replaced by an integer
passed as a parameter, it can be vectorized. This can be vectorized by GCC
trunk.

Tested on aarch64-linux

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