[llvm-bugs] [Bug 49170] New: Failure to optimize strcat immediately after strcpy

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49170

            Bug ID: 49170
           Summary: Failure to optimize strcat immediately after strcpy
           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 *s)
{
    strcpy(s, "a");
    strcat(s, "a");
}

This can be optimized to `memcpy(s, "aa", 3);`. This transformation is done by
GCC, but not by LLVM.

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