title: Why would /Qvec-report:2 return nothing ? (MSVC 2012)
body: <p>I tried the /Qvec-report:2 option to see if the MSVC auto-vectorizer would be any use. Unfortunately, I didn't get any result, positive nor negative:</p>
  
  <pre><code>&gt;  Microsoft (R) C/C++ Optimizing Compiler Version 17.00.60610.1 for x86
  1&gt;  Copyright (C) Microsoft Corporation.  All rights reserved.
  1&gt;  
  1&gt;  cl /c /Zi /nologo- /W3 /WX- /O2 /Ob2 /Oi /Oy /GL /D WIN32 /D _SCL_SECURE_NO_WARNINGS /D _CRT_SECURE_NO_WARNINGS /D NDEBUG /D _LIB /D _UNICODE /D UNICODE /Gm- /EHsc /MD /GS /Gy /arch:SSE2 /fp:fast /Zc:wchar_t /Zc:forScope /Yu"stdafx.h" /Fp"Release\(redacted).pch" /Fo"Release\\" /Fd"Release\vc110.pdb" /Gd /TP /analyze- /errorReport:prompt  /Qvec-report:2 (redacted).cpp
  1&gt;cl : Command line warning D9035: option 'nologo-' has been deprecated and will be removed in a future release
  1&gt;  
  1&gt;  (redacted).cpp
  1&gt;
  1&gt;Build succeeded.
  </code></pre>
  
  <p>I expected a message similar to </p>
  
  <pre><code>--- Analyzing function: main 
  c:\source.cpp(4) : loop vectorized 
  c:\source.cpp(5) : loop not vectorized due to reason '1200'
  </code></pre>