1; RUN: llc < %s -asm-verbose=false -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -wasm-keep-registers | FileCheck %s
2
3; This tests that indirectbr instructions are lowered to switches. Currently we
4; just re-use the IndirectBrExpand Pass; it has its own IR-level test.
5; So this test just ensures that the pass gets run and we can lower indirectbr
6
7target triple = "wasm32"
8
9@test1.targets = constant [4 x i8*] [i8* blockaddress(@test1, %bb0),
10                                     i8* blockaddress(@test1, %bb1),
11                                     i8* blockaddress(@test1, %bb2),
12                                     i8* blockaddress(@test1, %bb3)]
13
14; Just check the barest skeleton of the structure
15; CHECK-LABEL: test1:
16; CHECK: i32.load
17; CHECK: i32.load $[[DEST:.+]]=
18; CHECK: loop
19; CHECK: block
20; CHECK: block
21; CHECK: end_block
22; CHECK: block
23; CHECK: block
24; CHECK: br_table $[[DEST]]
25; CHECK: end_block
26; CHECK: end_block
27; CHECK: i32.load $[[DEST]]=
28; CHECK: end_loop
29
30; CHECK: test1.targets:
31; CHECK-NEXT: .int32
32; CHECK-NEXT: .int32
33; CHECK-NEXT: .int32
34; CHECK-NEXT: .int32
35
36define void @test1(i32* readonly %p, i32* %sink) #0 {
37
38entry:
39  %i0 = load i32, i32* %p
40  %target.i0 = getelementptr [4 x i8*], [4 x i8*]* @test1.targets, i32 0, i32 %i0
41  %target0 = load i8*, i8** %target.i0
42  ; Only a subset of blocks are viable successors here.
43  indirectbr i8* %target0, [label %bb0, label %bb1]
44
45
46bb0:
47  store volatile i32 0, i32* %sink
48  br label %latch
49
50bb1:
51  store volatile i32 1, i32* %sink
52  br label %latch
53
54bb2:
55  store volatile i32 2, i32* %sink
56  br label %latch
57
58bb3:
59  store volatile i32 3, i32* %sink
60  br label %latch
61
62latch:
63  %i.next = load i32, i32* %p
64  %target.i.next = getelementptr [4 x i8*], [4 x i8*]* @test1.targets, i32 0, i32 %i.next
65  %target.next = load i8*, i8** %target.i.next
66  ; A different subset of blocks are viable successors here.
67  indirectbr i8* %target.next, [label %bb1, label %bb2]
68}
69