File: basic-undef-test.ll

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llvm-toolchain-7 1%3A7.0.1-8~deb9u3
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; RUN: opt -basicaa -gvn -S < %s | FileCheck %s
; ModuleID = 'test3.ll'
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"

define i32 @main(i32 *%foo)  {
entry:
; CHECK: load i32, i32* %foo, align 4
  %0 = load i32, i32* %foo, align 4
  store i32 5, i32* undef, align 4
; CHECK-NOT: load i32, i32* %foo, align 4
  %1 = load i32, i32* %foo, align 4
; CHECK: add i32 %0, %0
  %2 = add i32 %0, %1
  ret i32 %2
}