1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -S -instcombine %s -o - | FileCheck %s
3
4; All the "useless" instructions should be removed and we shouldn't crash.
5
6target datalayout = "p:16:16"
7
8%i64_t = type i64
9
10@a = external global i16
11@b = external global i16*
12
13define void @f(i1 %cond) {
14; CHECK-LABEL: @f(
15; CHECK-NEXT:  bb0:
16; CHECK-NEXT:    [[T12:%.*]] = alloca [2 x i32], align 8
17; CHECK-NEXT:    [[T12_SUB:%.*]] = getelementptr inbounds [2 x i32], [2 x i32]* [[T12]], i16 0, i16 0
18; CHECK-NEXT:    br i1 [[COND:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
19; CHECK:       bb1:
20; CHECK-NEXT:    [[T8:%.*]] = ptrtoint [2 x i32]* [[T12]] to i16
21; CHECK-NEXT:    store i16 [[T8]], i16* @a, align 2
22; CHECK-NEXT:    unreachable
23; CHECK:       bb2:
24; CHECK-NEXT:    [[T9:%.*]] = load i16*, i16** @b, align 2
25; CHECK-NEXT:    store i16 0, i16* [[T9]], align 2
26; CHECK-NEXT:    [[T10:%.*]] = load i32, i32* [[T12_SUB]], align 8
27; CHECK-NEXT:    [[T11:%.*]] = add i32 [[T10]], -1
28; CHECK-NEXT:    store i32 [[T11]], i32* [[T12_SUB]], align 8
29; CHECK-NEXT:    ret void
30;
31bb0:
32  %t1 = alloca %i64_t
33  %t2 = bitcast %i64_t* %t1 to i32*
34  %useless3 = bitcast %i64_t* %t1 to i16*
35  %useless4 = getelementptr inbounds i16, i16* %useless3, i16 undef
36  %useless5 = bitcast i16* %useless4 to i32*
37  br i1 %cond, label %bb1, label %bb2
38
39bb1:                                              ; preds = %bb0
40  %useless6 = insertvalue [1 x i32*] undef, i32* %t2, 0
41  %useless7 = insertvalue [1 x i32*] %useless6, i32* null, 0
42  %t8 = ptrtoint i32* %t2 to i16
43  store i16 %t8, i16* @a
44  unreachable
45
46bb2:                                              ; preds = %bb0
47  %t9 = load i16*, i16** @b
48  store i16 0, i16* %t9
49  %t10 = load i32, i32* %t2
50  %t11 = sub i32 %t10, 1
51  store i32 %t11, i32* %t2
52  ret void
53}
54