[llvm-bugs] [Bug 47670] New: No loop vectorization for loop guarded by condition

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47670

            Bug ID: 47670
           Summary: No loop vectorization for loop guarded by condition
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: david.bolvansky at gmail.com
                CC: llvm-bugs at lists.llvm.org

No vectorization:
unsigned sum_small(unsigned data[], bool b) {
    unsigned sum = 0;
    if (b)   {
        for (int i = 0; i < 32; ++i) {
            sum += data[i];
        }
    }
    return sum;
}

Vectorized:
unsigned sum_small(unsigned data[], bool b) {
    unsigned sum = 0;
   // if (b)   {
        for (int i = 0; i < 32; ++i) {
            sum += data[i];
        }
  //  }
    return sum;
}


https://godbolt.org/z/oWPf9x

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