[llvm-bugs] [Bug 52051] New: Failure to optimize out __strcpy_chk when source can change but is always below buffer size

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52051

            Bug ID: 52051
           Summary: Failure to optimize out __strcpy_chk when source can
                    change but is always below buffer size
           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 buf[20];

void foo(bool c)
{
  __builtin___strcpy_chk(buf, c ? "gh" : "e", sizeof(buf));
}

This can be optimized to `strcpy(buf, c ? "gh" : "e");`. This optimization is
done by GCC, but not by LLVM.

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