1; With sub reassociation, constant folding can eliminate the 12 and -12 constants.
2;
3; RUN: opt < %s -reassociate -instcombine -S | not grep 12
4
5define i32 @test(i32 %A, i32 %B) {
6	%X = add i32 -12, %A		; <i32> [#uses=1]
7	%Y = sub i32 %X, %B		; <i32> [#uses=1]
8	%Z = add i32 %Y, 12		; <i32> [#uses=1]
9	ret i32 %Z
10}
11
12