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1; RUN: opt < %s -passes=instcombine -disable-output2; PR15943 4define i64 @test(i16 %tmp510, i16 %tmp512) {5 %W = sext i16 %tmp510 to i32 ; <i32> [#uses=1]6 %X = sext i16 %tmp512 to i32 ; <i32> [#uses=1]7 %Y = add i32 %W, %X ; <i32> [#uses=1]8 %Z = sext i32 %Y to i64 ; <i64> [#uses=1]9 ret i64 %Z10}11