<html>
    <head>
      <base href="http://llvm.org/bugs/" />
    </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 --- - fast-isel cannot handle strlen"
   href="http://llvm.org/bugs/show_bug.cgi?id=22277">22277</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>fast-isel cannot handle strlen
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </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>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>LLVM Codegen
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>rkotler@mips.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>~/llvmw/build/Deb~/llvmw/build/Debug+Asserts/bin/clang -O0  -mllvm
-fast-isel-verbose -mllvm -fast-isel strlen1.c
strlen1.c:12:3: warning: implicitly declaring library function 'printf' with
      type 'int (const char *, ...)'
  printf("%i\n", len);
  ^
strlen1.c:12:3: note: include the header <stdio.h> or explicitly provide a
      declaration for 'printf'
FastISel missed call:   %call = call i64 @strlen(i8* %0) #3
1 warning generated.

#include <string.h>

char *hello = "hello";
int len;

void foo() {
  len = strlen(hello);
}

int main() {
  foo();
  printf("%i\n", len);
}</pre>
        </div>
      </p>
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