; With sub reassociation, constant folding can eliminate the two 12 constants.
;
; RUN: llvm-as < %s | opt -reassociate -constprop -dce | llvm-dis | not grep 12
define i32 @test(i32 %A, i32 %B, i32 %C, i32 %D) {
%M = add i32 %A, 12 ; <i32> [#uses=1]
%N = add i32 %M, %B ; <i32> [#uses=1]
%O = add i32 %N, %C ; <i32> [#uses=1]
%P = sub i32 %D, %O ; <i32> [#uses=1]
%Q = add i32 %P, 12 ; <i32> [#uses=1]
ret i32 %Q
}