[LLVMbugs] [Bug 13899] New: aligned move used with unaligned stack [x86, windows]

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Sep 21 12:53:31 PDT 2012


             Bug #: 13899
           Summary: aligned move used with unaligned stack [x86,windows]
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: matt at pharr.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 9248
  --> http://llvm.org/bugs/attachment.cgi?id=9248
test case

With the attached test case (32-bit x86, Windows), llc generates the following
assembly.  Note that an aligned move is used, even though the stack isn't
necessarily 16-byte aligned going into the function.  (And thus, the code
crashes when it is run in this case.)

_bar:                                   # @bar
# BB#0:                                 # %allocas
    pushl    %ebp
    movl    %esp, %ebp
    subl    $16, %esp
    vmovaps    8(%ebp), %xmm4
    vmovaps    %xmm4, (%esp)
    calll    _foo
    addl    $16, %esp
    popl    %ebp

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