[LLVMbugs] [Bug 20736] New: infloop in x86 dag combine

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20736

            Bug ID: 20736
           Summary: infloop in x86 dag combine
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: nlewycky at google.com
                CC: chandlerc at gmail.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Testcase:

; ModuleID = 'b.bc'
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: uwtable
define void @test() unnamed_addr #0 align 2 {
bb:
  %tmp13 = load <2 x double>* undef, align 1
  %.sroa.3.24.vec.extract = extractelement <2 x double> %tmp13, i32 1
  store double %.sroa.3.24.vec.extract, double* undef, align 8
  unreachable
}

attributes #0 = { uwtable "less-precise-fpmad"="false"
"no-frame-pointer-elim"="false" "no-infs-fp-math"="false"
"no-nans-fp-math"="false" "stack-protector-buffer-size"="8"
"unsafe-fp-math"="false" "use-soft-float"="false" }

Reproduce with "llc b.ll" at r216133.

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