1 target datalayout = "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"
3 ; RUN: opt < %s -instcombine -S | FileCheck %s
8 @int = global i32 zeroinitializer
10 ; Zero byte allocas should be merged if they can't be deleted.
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 )
27 ; Zero byte allocas should be deleted.
30 define void @test2() {
31 %A = alloca i32 ; <i32*> [#uses=1]
32 store i32 123, i32* %A
36 ; Zero byte allocas should be deleted.
39 define 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
47 ; CHECK: = zext i32 %n to i64
48 ; CHECK: %A = alloca i32, i64 %
49 define i32* @test4(i32 %n) {
50 %A = alloca i32, i32 %n
54 ; Allocas which are only used by GEPs, bitcasts, and stores (transitively)
56 define void @test5() {
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
79 declare void @f(i32* %p)
81 ; Check that we don't delete allocas in some erroneous cases.
82 define void @test6() {
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)