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    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [OPENMP] positive loop step not recognized as such"
   href="https://bugs.llvm.org/show_bug.cgi?id=33062">33062</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[OPENMP] positive loop step not recognized as such
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Keywords</th>
          <td>compile-fail
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Frontend
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>hstong@ca.ibm.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The increment expression in the code below increases the loop counter by 1.
Clang generates diagnostics which claim otherwise.

### SOURCE (<stdin>):
int main(void) {
#pragma omp for
  for (unsigned i = 0; i < 10; i -= 0u - 1u) { }
}


### COMPILER INVOCATION:
clang -fsyntax-only -x c -std=c99 -fopenmp -


### OUTPUT:
<stdin>:3:40: error: increment expression must cause 'i' to increase on each
iteration of OpenMP for loop
  for (unsigned i = 0; i < 10; i -= 0u - 1u) { }
                                    ~~~^~~~
<stdin>:3:26: note: loop step is expected to be positive due to this condition
  for (unsigned i = 0; i < 10; i -= 0u - 1u) { }
                       ~~^~~~
1 error generated.


### EXPECTED OUTPUT:
(Compiles successfully).


### COMPILER VERSION INFO (clang -v):
clang version 5.0.0 (<a href="https://github.com/llvm-mirror/clang.git">https://github.com/llvm-mirror/clang.git</a>
600a9e6e11f067dbb921c742b6fb676e0ac045bd)
(<a href="https://github.com/llvm-mirror/llvm.git">https://github.com/llvm-mirror/llvm.git</a>
f0a3e25eca945f00368b68c9aa006b95b92fafaf)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/wandbox/clang-head/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Selected multilib: .;@m64</pre>
        </div>
      </p>


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