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1; RUN: opt < %s -instcombine -S | grep " sub " | count 1
2; PR2047
3
4define i32 @l(i32 %a, i32 %b, i32 %c, i32 %d) {
5entry:
6	%b.neg = sub i32 0, %b		; <i32> [#uses=1]
7	%c.neg = sub i32 0, %c		; <i32> [#uses=1]
8	%sub4 = add i32 %c.neg, %b.neg		; <i32> [#uses=1]
9	%sub6 = add i32 %sub4, %d		; <i32> [#uses=1]
10	ret i32 %sub6
11}
12