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
|
; RUN: opt -instcombine -S < %s | FileCheck %s
target datalayout = "e-m:e-p:64:64:64-i64:64-f80:128-n8:16:32:64-S128"
; Check that nonnull metadata is propagated from dominating load.
; CHECK-LABEL: @combine_metadata_dominance1(
; CHECK-LABEL: bb1:
; CHECK: load i32*, i32** %p, align 8, !nonnull !0
; CHECK-NOT: load i32*, i32** %p
define void @combine_metadata_dominance1(i32** %p) {
entry:
%a = load i32*, i32** %p, !nonnull !0
br label %bb1
bb1:
%b = load i32*, i32** %p
store i32 0, i32* %a
store i32 0, i32* %b
ret void
}
declare i32 @use(i32*, i32) readonly
; Check that nonnull from the dominated load does not get propagated.
; There are some cases where it would be safe to keep it.
; CHECK-LABEL: @combine_metadata_dominance2(
; CHECK-NOT: nonnull
define void @combine_metadata_dominance2(i32** %p) {
entry:
%a = load i32*, i32** %p
br i1 undef, label %bb1, label %bb2
bb1:
%b = load i32*, i32** %p, !nonnull !0
store i32 0, i32* %a
store i32 0, i32* %b
ret void
bb2:
ret void
}
!0 = !{}
|
