1; Test that LICM uses basicaa to do alias analysis, which is capable of
2; disambiguating some obvious cases.  If LICM is able to disambiguate the
3; two pointers, then the load should be hoisted, and the store sunk.
4
5; RUN: opt < %s -basicaa -licm -S | FileCheck %s
6target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
7
8@A = global i32 7               ; <i32*> [#uses=3]
9@B = global i32 8               ; <i32*> [#uses=2]
10@C = global [2 x i32] [ i32 4, i32 8 ]          ; <[2 x i32]*> [#uses=2]
11
12define i32 @test1(i1 %c) {
13        %Atmp = load i32* @A            ; <i32> [#uses=2]
14        br label %Loop
15
16Loop:           ; preds = %Loop, %0
17        %ToRemove = load i32* @A                ; <i32> [#uses=1]
18        store i32 %Atmp, i32* @B
19        br i1 %c, label %Out, label %Loop
20
21Out:            ; preds = %Loop
22        %X = sub i32 %ToRemove, %Atmp           ; <i32> [#uses=1]
23        ret i32 %X
24
25; The Loop block should be empty after the load/store are promoted.
26; CHECK:     @test1
27; CHECK:        load i32* @A
28; CHECK:      Loop:
29; CHECK-NEXT:   br i1 %c, label %Out, label %Loop
30; CHECK:      Out:
31; CHECK:        store i32 %Atmp, i32* @B
32}
33
34define i32 @test2(i1 %c) {
35        br label %Loop
36
37Loop:           ; preds = %Loop, %0
38        %AVal = load i32* @A            ; <i32> [#uses=2]
39        %C0 = getelementptr [2 x i32]* @C, i64 0, i64 0         ; <i32*> [#uses=1]
40        store i32 %AVal, i32* %C0
41        %BVal = load i32* @B            ; <i32> [#uses=2]
42        %C1 = getelementptr [2 x i32]* @C, i64 0, i64 1         ; <i32*> [#uses=1]
43        store i32 %BVal, i32* %C1
44        br i1 %c, label %Out, label %Loop
45
46Out:            ; preds = %Loop
47        %X = sub i32 %AVal, %BVal               ; <i32> [#uses=1]
48        ret i32 %X
49; The Loop block should be empty after the load/store are promoted.
50; CHECK:     @test2
51; CHECK:      Loop:
52; CHECK-NEXT:   br i1 %c, label %Out, label %Loop
53}
54
55