noalias.ll
1.17 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
; RUN: opt -scoped-noalias -basicaa -newgvn -S < %s | FileCheck %s
define i32 @test1(i32* %p, i32* %q) {
; CHECK-LABEL: @test1(i32* %p, i32* %q)
; CHECK: load i32, i32* %p
; CHECK-NOT: noalias
; CHECK: %c = add i32 %a, %a
%a = load i32, i32* %p, !noalias !0
%b = load i32, i32* %p
%c = add i32 %a, %b
ret i32 %c
}
define i32 @test2(i32* %p, i32* %q) {
; CHECK-LABEL: @test2(i32* %p, i32* %q)
; CHECK: load i32, i32* %p, !alias.scope !0
; CHECK: %c = add i32 %a, %a
%a = load i32, i32* %p, !alias.scope !0
%b = load i32, i32* %p, !alias.scope !0
%c = add i32 %a, %b
ret i32 %c
}
; FIXME: In this case we can do better than intersecting the scopes, and can
; concatenate them instead. Both loads are in the same basic block, the first
; makes the second safe to speculatively execute, and there are no calls that may
; throw in between.
define i32 @test3(i32* %p, i32* %q) {
; CHECK-LABEL: @test3(i32* %p, i32* %q)
; CHECK: load i32, i32* %p, !alias.scope !1
; CHECK: %c = add i32 %a, %a
%a = load i32, i32* %p, !alias.scope !1
%b = load i32, i32* %p, !alias.scope !2
%c = add i32 %a, %b
ret i32 %c
}
declare i32 @foo(i32*) readonly
!0 = !{!0}
!1 = !{!1}
!2 = !{!0, !1}