externally-initialized.ll
1.02 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
; RUN: opt < %s -S -globalopt | FileCheck %s
; This global is externally_initialized, which may modify the value between
; it's static initializer and any code in this module being run, so the only
; write to it cannot be merged into the static initialiser.
; CHECK: @a = internal unnamed_addr externally_initialized global i32 undef
@a = internal externally_initialized global i32 undef
; This global is stored to by the external initialization, so cannot be
; constant-propagated and removed, despite the fact that there are no writes
; to it.
; CHECK: @b = internal unnamed_addr externally_initialized global i32 undef
@b = internal externally_initialized global i32 undef
define void @foo() {
; CHECK-LABEL: foo
entry:
; CHECK: store i32 42, i32* @a
store i32 42, i32* @a
ret void
}
define i32 @bar() {
; CHECK-LABEL: bar
entry:
; CHECK: %val = load i32, i32* @a
%val = load i32, i32* @a
ret i32 %val
}
define i32 @baz() {
; CHECK-LABEL: baz
entry:
; CHECK: %val = load i32, i32* @b
%val = load i32, i32* @b
ret i32 %val
}