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 ; Zero byte allocas should be deleted.
12 %X = alloca [0 x i32] ; <[0 x i32]*> [#uses=1]
13 call void (...)* @use( [0 x i32]* %X )
14 %Y = alloca i32, i32 0 ; <i32*> [#uses=1]
15 call void (...)* @use( i32* %Y )
16 %Z = alloca { } ; <{ }*> [#uses=1]
17 call void (...)* @use( { }* %Z )
21 ; Zero byte allocas should be deleted.
24 define void @test2() {
25 %A = alloca i32 ; <i32*> [#uses=1]
26 store i32 123, i32* %A
30 ; Zero byte allocas should be deleted.
33 define void @test3() {
34 %A = alloca { i32 } ; <{ i32 }*> [#uses=1]
35 %B = getelementptr { i32 }* %A, i32 0, i32 0 ; <i32*> [#uses=1]
36 store i32 123, i32* %B
41 ; CHECK: = zext i32 %n to i64
42 ; CHECK: %A = alloca i32, i64 %
43 define i32* @test4(i32 %n) {
44 %A = alloca i32, i32 %n
48 ; Allocas which are only used by GEPs, bitcasts, and stores (transitively)
50 define void @test5() {
59 %a.1 = getelementptr { i32 }* %a, i32 0, i32 0
60 store i32 123, i32* %a.1
61 store i32* %a.1, i32** %b
62 %b.1 = bitcast i32** %b to i32*
63 store i32 123, i32* %b.1
64 %a.2 = getelementptr { i32 }* %a, i32 0, i32 0
65 store atomic i32 2, i32* %a.2 unordered, align 4
66 %a.3 = getelementptr { i32 }* %a, i32 0, i32 0
67 store atomic i32 3, i32* %a.3 release, align 4
68 %a.4 = getelementptr { i32 }* %a, i32 0, i32 0
69 store atomic i32 4, i32* %a.4 seq_cst, align 4
73 declare void @f(i32* %p)
75 ; Check that we don't delete allocas in some erroneous cases.
76 define void @test6() {
86 %a.1 = getelementptr { i32 }* %a, i32 0, i32 0
87 store volatile i32 123, i32* %a.1
88 tail call void @f(i32* %b)