[LLVMbugs] [Bug 13700] New: inlined function local memory is not reused when function returns

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13700

             Bug #: 13700
           Summary: inlined function local memory is not reused when
                    function returns
           Product: libraries
           Version: 3.1
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: yozh at mx1.ru
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 9110
  --> http://llvm.org/bugs/attachment.cgi?id=9110
recursive function, large locals

Code: https://gist.github.com/3469192 (also attached)

Works fine when compiled with -O0. When compiled with -O2, results in stack
overflow: "foo" function is inlined in "bar". When "foo" function returns,
"bar" does not reuse memory allocated for "foo" for recursive invocation of
self.

Both Clang and LLVM-GCC have this issue.

Code works fine in GCC.

% clang --version
Apple clang version 4.0 (tags/Apple/clang-421.0.57) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin12.1.0
Thread model: posix

% clang --version
clang version 3.1 (branches/release_31)
Target: x86_64-unknown-linux-gnu
Thread model: posix

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