[LLVMbugs] [Bug 2370] New: memmove(a,a,n) should be optimized out

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2370

           Summary: memmove(a,a,n) should be optimized out
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sharparrow1 at yahoo.com
                CC: llvmbugs at cs.uiuc.edu


Per description; testcase:

target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i686-pc-linux-gnu"

define void @x(i8* %a) {
entry:
        tail call void @llvm.memmove.i32( i8* %a, i8* %a, i32 100, i32 1 )
        ret void
}

This function does nothing. Pretty simple optimization, although likely not
useful very often.  Note that this transformation can be done slightly more
powerfully if alias analysis is available.


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