[llvm-bugs] [Bug 47149] New: Failure to optimize comparison of strlen with 0 on string where operations on it should force the result to be non-0

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47149

            Bug ID: 47149
           Summary: Failure to optimize comparison of strlen with 0 on
                    string where operations on it should force the result
                    to be non-0
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: llvm-bugs at lists.llvm.org

char a[32];

bool f(void)
{
    a[0] = '1';
    return strlen(a) == 0;
}

The operand of the `return` statement can be optimized to `false`. This
transformation is done by GCC, but not by LLVM.

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