[LLVMbugs] [Bug 8749] New: PPC stack references broken

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8749

           Summary: PPC stack references broken
           Product: new-bugs
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: dalej at apple.com
                CC: llvmbugs at cs.uiuc.edu


Run the following through  llc -disable-fp-elim

; ModuleID = 'main.c'
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-f128:64:128-n32"
target triple = "powerpc-apple-darwin9.8"

define i32 @main() nounwind {
entry:
  %retval = alloca i32
  %0 = alloca i32
  %"alloca point" = bitcast i32 0 to i32
  store i32 0, i32* %0, align 4
  %1 = load i32* %0, align 4
  store i32 %1, i32* %retval, align 4
  br label %return

return:                                           ; preds = %entry
  %retval1 = load i32* %retval
  ret i32 %retval1
}

You will see

    stw r3, -12(r31)

but R31 is not set anywhere.
I suspect this was introduced in Anton's rewrite of this area, but haven't
analyzed further.

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