File: 2005-01-17-CycleInDAG.ll

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llvm-toolchain-20 1%3A20.1.6-1~exp1
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; This testcase was distilled from 132.ijpeg.  Bsaically we cannot fold the
; load into the sub instruction here as it induces a cycle in the dag, which
; is invalid code (there is no correct way to order the instruction).  Check
; that we do not fold the load into the sub.

; RUN: llc < %s -mtriple=i686-- | FileCheck %s

@GLOBAL = external dso_local global i32

define i32 @test(ptr %P1, ptr %P2, ptr %P3) nounwind {
; CHECK-LABEL: test:
entry:
  %L = load i32, ptr @GLOBAL
  store i32 12, ptr %P2
  %Y = load i32, ptr %P3
  %Z = sub i32 %Y, %L
  ret i32 %Z
; CHECK-NOT: {{sub.*GLOBAL}}
}