[LLVMbugs] [Bug 8740] dse can be too eager

Mon Dec 6 13:11:13 PST 2010

http://llvm.org/bugs/show_bug.cgi?id=8740

Chris Lattner <clattner at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID

--- Comment #1 from Chris Lattner <clattner at apple.com> 2010-12-06 15:11:13 CST ---
DSE is doing the correct thing here, your IR is invalid:

  %11 = tail call fastcc {} %10(i8* %9) nounwind

This call is loading from the %0 alloca, which is illegal for calls marked
tail.  See LangRef.html for more information.  If you remove "tail" from the
call, DSE doesn't change the behavior of the program.

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