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      1 ; RUN: opt < %s -reassociate -instcombine -constprop -dce -S | not grep add
      2 
      3 define i32 @test(i32 %A) {
      4 	%X = add i32 %A, 1		; <i32> [#uses=1]
      5 	%Y = add i32 %A, 1		; <i32> [#uses=1]
      6 	%r = sub i32 %X, %Y		; <i32> [#uses=1]
      7 	ret i32 %r
      8 }
      9 
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