1 ; This test makes sure that these instructions are properly eliminated.
3 ; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep phi
6 define i32 @test1(i32 %A, i1 %b) {
8 br i1 %b, label %BB1, label %BB2
11 ; Combine away one argument PHI nodes
12 %B = phi i32 [ %A, %BB0 ] ; <i32> [#uses=1]
19 define i32 @test2(i32 %A, i1 %b) {
21 br i1 %b, label %BB1, label %BB2
26 BB2: ; preds = %BB1, %BB0
27 ; Combine away PHI nodes with same values
28 %B = phi i32 [ %A, %BB0 ], [ %A, %BB1 ] ; <i32> [#uses=1]
32 define i32 @test3(i32 %A, i1 %b) {
36 Loop: ; preds = %Loop, %BB0
37 ; PHI has same value always.
38 %B = phi i32 [ %A, %BB0 ], [ %B, %Loop ] ; <i32> [#uses=2]
39 br i1 %b, label %Loop, label %Exit
45 define i32 @test4(i1 %b) {
50 Loop: ; preds = %L2, %Loop
51 ; PHI has same value always.
52 %B = phi i32 [ %B, %L2 ], [ %B, %Loop ] ; <i32> [#uses=2]
53 br i1 %b, label %L2, label %Loop
59 define i32 @test5(i32 %A, i1 %b) {
63 Loop: ; preds = %Loop, %BB0
64 ; PHI has same value always.
65 %B = phi i32 [ %A, %BB0 ], [ undef, %Loop ] ; <i32> [#uses=1]
66 br i1 %b, label %Loop, label %Exit
72 define i32 @test6(i32 %A, i1 %b) {
74 %X = bitcast i32 %A to i32 ; <i32> [#uses=1]
75 br i1 %b, label %BB1, label %BB2
78 %Y = bitcast i32 %A to i32 ; <i32> [#uses=1]
81 BB2: ; preds = %BB1, %BB0
82 ;; Suck casts into phi
83 %B = phi i32 [ %X, %BB0 ], [ %Y, %BB1 ] ; <i32> [#uses=1]
87 define i32 @test7(i32 %A, i1 %b) {
91 Loop: ; preds = %Loop, %BB0
93 %B = phi i32 [ %A, %BB0 ], [ %C, %Loop ] ; <i32> [#uses=1]
94 %C = add i32 %B, 123 ; <i32> [#uses=1]
95 br i1 %b, label %Loop, label %Exit