[LLVMbugs] [Bug 4422] New: Incorrect alignment from alloca

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat Jun 20 08:42:01 PDT 2009


           Summary: Incorrect alignment from alloca
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: lennart at augustsson.net
                CC: llvmbugs at cs.uiuc.edu

When allocating memory with alloca for vectors on i386 the returned memory is
not always on 16 byte boundary as it has to be.
   a = alloca <2 x i64>
sometimes returns memory on 8 byte boundary, which means that using MMS
instructions to load and store will cause a fault.

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