1 ; RUN: llc < %s -march=x86-64 | grep lea | count 12
3 ; This testcase was written to demonstrate an instruction-selection problem,
4 ; however it also happens to expose a limitation in the DAGCombiner's
5 ; expression reassociation which causes it to miss opportunities for
6 ; constant folding due to the intermediate adds having multiple uses.
7 ; The Reassociate pass has similar limitations. If these limitations are
8 ; fixed, the test commands above will need to be updated to expect fewer
11 @g0 = weak global [1000 x i32] zeroinitializer, align 32 ; <[1000 x i32]*> [#uses=8]
12 @g1 = weak global [1000 x i32] zeroinitializer, align 32 ; <[1000 x i32]*> [#uses=7]
16 %tmp4 = load i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 0) ; <i32> [#uses=1]
17 %tmp8 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 0) ; <i32> [#uses=1]
18 %tmp9 = add i32 %tmp4, 1 ; <i32> [#uses=1]
19 %tmp10 = add i32 %tmp9, %tmp8 ; <i32> [#uses=2]
20 store i32 %tmp10, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 1)
21 %tmp8.1 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 1) ; <i32> [#uses=1]
22 %tmp9.1 = add i32 %tmp10, 1 ; <i32> [#uses=1]
23 %tmp10.1 = add i32 %tmp9.1, %tmp8.1 ; <i32> [#uses=2]
24 store i32 %tmp10.1, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 2)
25 %tmp8.2 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 2) ; <i32> [#uses=1]
26 %tmp9.2 = add i32 %tmp10.1, 1 ; <i32> [#uses=1]
27 %tmp10.2 = add i32 %tmp9.2, %tmp8.2 ; <i32> [#uses=2]
28 store i32 %tmp10.2, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 3)
29 %tmp8.3 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 3) ; <i32> [#uses=1]
30 %tmp9.3 = add i32 %tmp10.2, 1 ; <i32> [#uses=1]
31 %tmp10.3 = add i32 %tmp9.3, %tmp8.3 ; <i32> [#uses=2]
32 store i32 %tmp10.3, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 4)
33 %tmp8.4 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 4) ; <i32> [#uses=1]
34 %tmp9.4 = add i32 %tmp10.3, 1 ; <i32> [#uses=1]
35 %tmp10.4 = add i32 %tmp9.4, %tmp8.4 ; <i32> [#uses=2]
36 store i32 %tmp10.4, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 5)
37 %tmp8.5 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 5) ; <i32> [#uses=1]
38 %tmp9.5 = add i32 %tmp10.4, 1 ; <i32> [#uses=1]
39 %tmp10.5 = add i32 %tmp9.5, %tmp8.5 ; <i32> [#uses=2]
40 store i32 %tmp10.5, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 6)
41 %tmp8.6 = load i32* getelementptr ([1000 x i32]* @g1, i32 0, i32 6) ; <i32> [#uses=1]
42 %tmp9.6 = add i32 %tmp10.5, 1 ; <i32> [#uses=1]
43 %tmp10.6 = add i32 %tmp9.6, %tmp8.6 ; <i32> [#uses=1]
44 store i32 %tmp10.6, i32* getelementptr ([1000 x i32]* @g0, i32 0, i32 7)