1 ; This entire chain of computation should be optimized away, but
2 ; wasn't because the two multiplies were not detected as being identical.
4 ; RUN: llvm-as < %s | opt -gcse -instcombine -dce | \
5 ; RUN: llvm-dis | not grep sub
7 define i32 @vnum_test4(i32* %data) {
8 %idx1 = getelementptr i32* %data, i64 1 ; <i32*> [#uses=1]
9 %idx2 = getelementptr i32* %data, i64 3 ; <i32*> [#uses=1]
10 %reg1101 = load i32* %idx1 ; <i32> [#uses=2]
11 %reg1111 = load i32* %idx2 ; <i32> [#uses=2]
12 %reg109 = mul i32 %reg1101, %reg1111 ; <i32> [#uses=1]
13 %reg108 = mul i32 %reg1111, %reg1101 ; <i32> [#uses=1]
14 %reg121 = sub i32 %reg108, %reg109 ; <i32> [#uses=1]