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From: "olegendo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/61056] New: strchr (x, 0) is not converted to strlen (x)
Date: Sun, 04 May 2014 16:22:00 -0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 4.10.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: olegendo at gcc dot gnu.org
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=61056

            Bug ID: 61056
           Summary: strchr (x, 0) is not converted to strlen (x)
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: olegendo at gcc dot gnu.org
            Target: sh*-*-*

At least on SH and r210026 the following:

extern "C" const char* strchr (const char*,int);

const char* test (const char* x)
{
  return strrchr (x, 0);
}

does not get converted to a strlen (x).  It seems that tree-ssa-strlen is
trying to do something but always fails.