[llvm-bugs] [Bug 27618] New: vectorization remark is printed multiple times

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27618

            Bug ID: 27618
           Summary: vectorization remark is printed multiple times
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: albertnetymk at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

```
#define SIZE (1 << 15)

#define MINDEX(n, m) (SIZE*(n)+(m))

#define XMM_ALIGNMENT_BYTES 16

float *restrict mat_a __attribute__((aligned (XMM_ALIGNMENT_BYTES)));
float *restrict vec_b __attribute__((aligned (XMM_ALIGNMENT_BYTES)));
float *restrict vec_c __attribute__((aligned (XMM_ALIGNMENT_BYTES)));

// __attribute__ ((noinline))
void matvec_autovec()
{
    int i, j;

    float tmp;
    for (i = 0; i < SIZE; i++) {
        tmp = 0;
        for (j = 0; j < SIZE; j++) {
            tmp += mat_a[MINDEX(i, j)] * vec_b[j];
        }
        vec_c[i] = tmp;
    }
}

void multiple()
{
    matvec_autovec();
}

int main(int argc, char **argv)
{
    return 0;
}
```
The command I used is `clang-3.8 -Ofast test.c  -Rpass=loop-vectorize`

```
test.c:22:9: remark: vectorized loop (vectorization width: 4, interleaved
count: 1) [-Rpass=loop-vectorize]
        for (j = 0; j < SIZE; j++) {
        ^
test.c:22:9: remark: vectorized loop (vectorization width: 4, interleaved
count: 1) [-Rpass=loop-vectorize]
```

The output reduces to 1 after I uncomment the `noinline` attribute.

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