1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt -S -instcombine %s -o - | FileCheck %s
4 ; All the "useless" instructions should be removed and we shouldn't crash.
6 target datalayout = "p:16:16"
10 @a = external global i16
11 @b = external global i16*
13 define void @f(i1 %cond) {
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:%.*]]
20 ; CHECK-NEXT: unreachable
22 ; CHECK-NEXT: [[T9:%.*]] = load i16*, i16** @b, align 2
23 ; CHECK-NEXT: store i16 0, i16* [[T9]], align 2
24 ; CHECK-NEXT: [[T10:%.*]] = load i32, i32* [[T12_SUB]], align 8
25 ; CHECK-NEXT: [[T11:%.*]] = add i32 [[T10]], -1
26 ; CHECK-NEXT: store i32 [[T11]], i32* [[T12_SUB]], align 8
27 ; CHECK-NEXT: ret void
31 %t2 = bitcast %i64_t* %t1 to i32*
32 %useless3 = bitcast %i64_t* %t1 to i16*
33 %useless4 = getelementptr inbounds i16, i16* %useless3, i16 undef
34 %useless5 = bitcast i16* %useless4 to i32*
35 br i1 %cond, label %bb1, label %bb2
38 %useless6 = insertvalue [1 x i32*] undef, i32* %t2, 0
39 %useless7 = insertvalue [1 x i32*] %useless6, i32* null, 0
40 %t8 = ptrtoint i32* %t2 to i16
41 store i16 %t8, i16* @a
45 %t9 = load i16*, i16** @b
47 %t10 = load i32, i32* %t2
48 %t11 = sub i32 %t10, 1
49 store i32 %t11, i32* %t2