<html>
    <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 - [InstCombine] Missing range check transformation"
   href="https://bugs.llvm.org/show_bug.cgi?id=43332">43332</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[InstCombine] Missing range check transformation
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </td>
        </tr>

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

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

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

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

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

        <tr>
          <th>Component</th>
          <td>Scalar Optimizations
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>david.bolvansky@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>int rangecheck (unsigned x) { return x - 1 <= __INT_MAX__ - 1; }

could be just (int) X > 0.

Clang
rangecheck(unsigned int):                        # @rangecheck(unsigned int)
        addl    $-1, %edi
        xorl    %eax, %eax
        cmpl    $2147483647, %edi       # imm = 0x7FFFFFFF
        setb    %al
        retq


GCC:
rangecheck(unsigned int):
        xor     eax, eax
        test    edi, edi
        setg    al
        ret</pre>
        </div>
      </p>


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