File: 2008-08-19-SubAndFetch.ll

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llvm-toolchain-3.5 1%3A3.5.2-3~bpo8%2B2
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; RUN: llc < %s -march=x86-64 | FileCheck %s

@var = external global i64		; <i64*> [#uses=1]

define i32 @main() nounwind {
entry:
; CHECK-LABEL: main:
; CHECK: lock
; CHECK: decq
	atomicrmw sub i64* @var, i64 1 monotonic
	unreachable
}