[LLVMbugs] [Bug 2962] New: stack realignment code does not work with alloca in function

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2962

           Summary: stack realignment code does not work with alloca in
                    function
           Product: libraries
           Version: 1.0
          Platform: PC
        OS/Version: All
            Status: NEW
          Keywords: miscompilation
          Severity: normal
          Priority: P2
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: clattner at apple.com
                CC: llvmbugs at cs.uiuc.edu


Stack realignment does not work properly for this case:

target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
target triple = "i386-pc-linux-gnu"

define void @foo(i32 %t) nounwind {
  %tmp1210 = alloca i8, i32 40, align 16
  store i8 0, i8* %tmp1210

  %x = alloca i8, i32 %t
  ret void
}


If you comment out "x", the stack realignment does work.  This causes
miscompilations when the code generator infers memsets using xmm regs e.g. Bug
2888


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