[llvm-bugs] [Bug 51594] New: [SVE] Don't generate SVE code for simple loop case without pragma

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https://bugs.llvm.org/show_bug.cgi?id=51594

            Bug ID: 51594
           Summary: [SVE] Don't generate SVE code for simple loop case
                    without pragma
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: zhongyunde at tom.com
                CC: arnaud.degrandmaison at arm.com,
                    llvm-bugs at lists.llvm.org, smithp352 at googlemail.com,
                    Ties.Stuij at arm.com

case from https://reviews.llvm.org/D91077, even with this simple case, the
newest clang will not generate SVE without the pragma
(https://godbolt.org/z/q97sjeqo3, which is fixed dimension Loop Vectorization),
while gcc can (https://godbolt.org/z/vvz7hP3Wq, which is scalable dimension).

void loop(int N, double *a, double *b) {
  // #pragma clang loop vectorize_width(4, scalable)
  for (int i = 0; i < N; i++) {
    a[i] = b[i] + 1.0;
  }
}

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