function-clobber.ll
1.37 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
; RUN: opt -basicaa -print-memoryssa -verify-memoryssa -analyze < %s 2>&1 | FileCheck %s
; RUN: opt -aa-pipeline=basic-aa -passes='print<memoryssa>,verify<memoryssa>' -disable-output < %s 2>&1 | FileCheck %s
;
; Ensuring that external functions without attributes are MemoryDefs
@g = external global i32
declare void @modifyG()
define i32 @foo() {
; CHECK: MemoryUse(liveOnEntry)
; CHECK-NEXT: %1 = load i32
%1 = load i32, i32* @g
; CHECK: 1 = MemoryDef(liveOnEntry)
; CHECK-NEXT: store i32 4
store i32 4, i32* @g, align 4
; CHECK: 2 = MemoryDef(1)
; CHECK-NEXT: call void @modifyG()
call void @modifyG()
; CHECK: MemoryUse(2)
; CHECK-NEXT: %2 = load i32
%2 = load i32, i32* @g
%3 = add i32 %2, %1
ret i32 %3
}
declare void @readEverything() readonly
declare void @clobberEverything()
; CHECK-LABEL: define void @bar
define void @bar() {
; CHECK: 1 = MemoryDef(liveOnEntry)
; CHECK-NEXT: call void @clobberEverything()
call void @clobberEverything()
br i1 undef, label %if.end, label %if.then
if.then:
; CHECK: MemoryUse(1)
; CHECK-NEXT: call void @readEverything()
call void @readEverything()
; CHECK: 2 = MemoryDef(1)
; CHECK-NEXT: call void @clobberEverything()
call void @clobberEverything()
br label %if.end
if.end:
; CHECK: 3 = MemoryPhi({%0,1},{if.then,2})
; CHECK: MemoryUse(3)
; CHECK-NEXT: call void @readEverything()
call void @readEverything()
ret void
}