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List:       llvm-bugs
Subject:    [LLVMbugs] [Bug 7270] New: DSE wrongly eliminates store,
From:       bugzilla-daemon () llvm ! org
Date:       2010-05-31 15:39:00
Message-ID: bug-7270-206 () http ! llvm ! org/bugs/
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http://llvm.org/bugs/show_bug.cgi?id=7270

           Summary: DSE wrongly eliminates store, related to byval
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs@nondot.org
        ReportedBy: baldrick@free.fr
                CC: llvmbugs@cs.uiuc.edu


Created an attachment (id=4955)
 --> (http://llvm.org/bugs/attachment.cgi?id=4955)
testcase .ll

This miscompilation occurs when building LLVM with dragonegg on x86-32.

Before running dse, the incoming parameters %arg1 and %arg2 are copied to
the locals %CS1 and %CS2, and then %CS1 and %CS2 are passed as the call
parameters to _ZN4llvm13AliasAnalysis13getModRefInfoENS_8CallSiteES1_.
After running "opt -dse", the copies are no longer made, and the uninitialized
values of %CS1 and %CS2 are passed instead.

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