[LLVMbugs] [Bug 5159] New: sroa and other passes does a rotten job on vector code from the gcc plugin

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5159

           Summary: sroa and other passes does a rotten job on vector code
                    from the gcc plugin
           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: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=3630)
 --> (http://llvm.org/bugs/attachment.cgi?id=3630)
testcase .ll

The basic problem with the testcase is that GCC works throughout with
<2 x double>, building up and manipulating parts of <8 x double> using
these.  It looks like sroa decides to turn the <2 x double> into giant
integers, and the final result is not happy.  It would have been better
to split the <2 x double> into two parts.


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