[Bug middle-end/58134] New: -ftree-vectorizer-verbose= shows vectroiyed loops only for N== 1 and N >2 but not for N==2

[burnus at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58134

            Bug ID: 58134
           Summary: -ftree-vectorizer-verbose=<n> shows vectroiyed loops
                    only for N== 1 and N >2 but not for N==2
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org

... -ftree-vectorizer-verbose=1 test.cc
test.cc:8: note: Vectorized loop

But no result for
-ftree-vectorizer-verbose=2 test.cc 2>&1|grep 'Vectorized loop'

Again with n >= 3:
-ftree-vectorizer-verbose=3 test.cc 2>&1|grep 'Vectorized loop'
test.cc:8: note: Vectorized loop


#include <algorithm>
typedef int myint;

void max(__restrict myint *data, myint val, int n) {
  //__assume_aligned(data,64);
  data = (myint*) __builtin_assume_aligned(data, 64);
  for (int i = 0; i < n; i++)
    data[i] = std::max(data[i], val);
}