llvm/test/Transforms/InstCombine/consecutive-fences.ll


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; RUN: opt -instcombine -S %s | FileCheck %s

; Make sure we collapse the fences in this case

; CHECK-LABEL: define void @tinkywinky
; CHECK-NEXT:   fence seq_cst
; CHECK-NEXT:   fence singlethread acquire
; CHECK-NEXT:   ret void
; CHECK-NEXT: }

define void @tinkywinky() {
  fence seq_cst
  fence seq_cst
  fence seq_cst
  fence singlethread acquire
  fence singlethread acquire
  fence singlethread acquire
  ret void
}

; CHECK-LABEL: define void @dipsy
; CHECK-NEXT:   fence seq_cst
; CHECK-NEXT:   fence singlethread seq_cst
; CHECK-NEXT:   ret void
; CHECK-NEXT: }

define void @dipsy() {
  fence seq_cst
  fence singlethread seq_cst
  ret void
}

; CHECK-LABEL: define void @patatino
; CHECK-NEXT:   fence acquire
; CHECK-NEXT:   fence seq_cst
; CHECK-NEXT:   fence acquire
; CHECK-NEXT:   fence seq_cst
; CHECK-NEXT:   ret void
; CHECK-NEXT: }

define void @patatino() {
  fence acquire
  fence seq_cst
  fence acquire
  fence seq_cst
  ret void
}