1; RUN: opt < %s -instcombine -S -default-data-layout="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" | FileCheck %s
2; RUN: opt < %s -instcombine -S -default-data-layout="E-p:32:32:32-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" | FileCheck %s -check-prefix=P32
3; RUN: opt < %s -instcombine -S | FileCheck %s -check-prefix=NODL
4
5
6declare void @use(...)
7
8@int = global i32 zeroinitializer
9
10; Zero byte allocas should be merged if they can't be deleted.
11; CHECK-LABEL: @test(
12; CHECK: alloca
13; CHECK-NOT: alloca
14define void @test() {
15        %X = alloca [0 x i32]           ; <[0 x i32]*> [#uses=1]
16        call void (...)* @use( [0 x i32]* %X )
17        %Y = alloca i32, i32 0          ; <i32*> [#uses=1]
18        call void (...)* @use( i32* %Y )
19        %Z = alloca {  }                ; <{  }*> [#uses=1]
20        call void (...)* @use( {  }* %Z )
21        %size = load i32* @int
22        %A = alloca {{}}, i32 %size
23        call void (...)* @use( {{}}* %A )
24        ret void
25}
26
27; Zero byte allocas should be deleted.
28; CHECK-LABEL: @test2(
29; CHECK-NOT: alloca
30define void @test2() {
31        %A = alloca i32         ; <i32*> [#uses=1]
32        store i32 123, i32* %A
33        ret void
34}
35
36; Zero byte allocas should be deleted.
37; CHECK-LABEL: @test3(
38; CHECK-NOT: alloca
39define void @test3() {
40        %A = alloca { i32 }             ; <{ i32 }*> [#uses=1]
41        %B = getelementptr { i32 }* %A, i32 0, i32 0            ; <i32*> [#uses=1]
42        store i32 123, i32* %B
43        ret void
44}
45
46; CHECK-LABEL: @test4(
47; CHECK: = zext i32 %n to i64
48; CHECK: %A = alloca i32, i64 %
49define i32* @test4(i32 %n) {
50  %A = alloca i32, i32 %n
51  ret i32* %A
52}
53
54; Allocas which are only used by GEPs, bitcasts, and stores (transitively)
55; should be deleted.
56define void @test5() {
57; CHECK-LABEL: @test5(
58; CHECK-NOT: alloca
59; CHECK-NOT: store
60; CHECK: ret
61
62entry:
63  %a = alloca { i32 }
64  %b = alloca i32*
65  %a.1 = getelementptr { i32 }* %a, i32 0, i32 0
66  store i32 123, i32* %a.1
67  store i32* %a.1, i32** %b
68  %b.1 = bitcast i32** %b to i32*
69  store i32 123, i32* %b.1
70  %a.2 = getelementptr { i32 }* %a, i32 0, i32 0
71  store atomic i32 2, i32* %a.2 unordered, align 4
72  %a.3 = getelementptr { i32 }* %a, i32 0, i32 0
73  store atomic i32 3, i32* %a.3 release, align 4
74  %a.4 = getelementptr { i32 }* %a, i32 0, i32 0
75  store atomic i32 4, i32* %a.4 seq_cst, align 4
76  ret void
77}
78
79declare void @f(i32* %p)
80
81; Check that we don't delete allocas in some erroneous cases.
82define void @test6() {
83; CHECK-LABEL: @test6(
84; CHECK-NOT: ret
85; CHECK: alloca
86; CHECK-NEXT: alloca
87; CHECK: ret
88
89entry:
90  %a = alloca { i32 }
91  %b = alloca i32
92  %a.1 = getelementptr { i32 }* %a, i32 0, i32 0
93  store volatile i32 123, i32* %a.1
94  tail call void @f(i32* %b)
95  ret void
96}
97
98; PR14371
99%opaque_type = type opaque
100%real_type = type { { i32, i32* } }
101
102@opaque_global = external constant %opaque_type, align 4
103
104define void @test7() {
105entry:
106  %0 = alloca %real_type, align 4
107  %1 = bitcast %real_type* %0 to i8*
108  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %1, i8* bitcast (%opaque_type* @opaque_global to i8*), i32 8, i32 1, i1 false)
109  ret void
110}
111
112declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
113
114
115; Check that the GEP indices use the pointer size, or 64 if unknown
116define void @test8() {
117; CHECK-LABEL: @test8(
118; CHECK: alloca [100 x i32]
119; CHECK: getelementptr inbounds [100 x i32]* %x1, i64 0, i64 0
120
121; P32-LABEL: @test8(
122; P32: alloca [100 x i32]
123; P32: getelementptr inbounds [100 x i32]* %x1, i32 0, i32 0
124
125; NODL-LABEL: @test8(
126; NODL: alloca [100 x i32]
127; NODL: getelementptr inbounds [100 x i32]* %x1, i64 0, i64 0
128  %x = alloca i32, i32 100
129  call void (...)* @use(i32* %x)
130  ret void
131}
132