[llvm-bugs] [Bug 47154] New: Failure to optimize strncpy to memcpy

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47154

            Bug ID: 47154
           Summary: Failure to optimize strncpy to memcpy
           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

void f(char *a)
{
    strncpy(a, "dp", 4);
}

This can be optimized to `memcpy(a, "dp\0\0", 4)` (and then most likely the
memcpy call can be inlined). This transformation is done by GCC, but not by
LLVM.

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