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; With sub reassociation, constant folding can eliminate the uses of %a.
;
; RUN: opt < %s -reassociate -instcombine -S | grep %a | count 1
; PR2047
define i32 @test(i32 %a, i32 %b, i32 %c) nounwind {
entry:
%tmp3 = sub i32 %a, %b ; <i32> [#uses=1]
%tmp5 = sub i32 %tmp3, %c ; <i32> [#uses=1]
%tmp7 = sub i32 %tmp5, %a ; <i32> [#uses=1]
ret i32 %tmp7
}
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