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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
From eff5dc809ed54701f2bb3e15c58d01881299cedf Mon Sep 17 00:00:00 2001
From: David Majnemer <david.majnemer@gmail.com>
Date: Tue, 11 Oct 2016 01:00:45 +0000
Subject: [rust-lang/llvm#55] [InstCombine] Transform !range metadata to
!nonnull when combining loads
When combining an integer load with !range metadata that does not include 0 to a pointer load, make sure emit !nonnull metadata on the newly-created pointer load. This prevents the !nonnull metadata from being dropped during a ptrtoint/inttoptr pair.
This fixes PR30597.
Patch by Ariel Ben-Yehuda!
Differential Revision: https://reviews.llvm.org/D25215
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283836 91177308-0d34-0410-b5e6-96231b3b80d8
---
.../InstCombine/InstCombineLoadStoreAlloca.cpp | 12 ++++++--
test/Transforms/InstCombine/PR30597.ll | 32 ++++++++++++++++++++++
2 files changed, 42 insertions(+), 2 deletions(-)
create mode 100644 test/Transforms/InstCombine/PR30597.ll
diff --git a/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp b/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
index d312983ed51b..26f4e764501a 100644
--- a/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
+++ b/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
@@ -380,8 +380,16 @@ static LoadInst *combineLoadToNewType(InstCombiner &IC, LoadInst &LI, Type *NewT
break;
case LLVMContext::MD_range:
// FIXME: It would be nice to propagate this in some way, but the type
- // conversions make it hard. If the new type is a pointer, we could
- // translate it to !nonnull metadata.
+ // conversions make it hard.
+
+ // If it's a pointer now and the range does not contain 0, make it !nonnull.
+ if (NewTy->isPointerTy()) {
+ unsigned BitWidth = IC.getDataLayout().getTypeSizeInBits(NewTy);
+ if (!getConstantRangeFromMetadata(*N).contains(APInt(BitWidth, 0))) {
+ MDNode *NN = MDNode::get(LI.getContext(), None);
+ NewLoad->setMetadata(LLVMContext::MD_nonnull, NN);
+ }
+ }
break;
}
}
diff --git a/test/Transforms/InstCombine/PR30597.ll b/test/Transforms/InstCombine/PR30597.ll
new file mode 100644
index 000000000000..c0803ed71204
--- /dev/null
+++ b/test/Transforms/InstCombine/PR30597.ll
@@ -0,0 +1,32 @@
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; Function Attrs: readonly uwtable
+define i1 @dot_ref_s(i32** noalias nocapture readonly dereferenceable(8)) {
+entry-block:
+ %loadedptr = load i32*, i32** %0, align 8, !nonnull !0
+ %ptrtoint = ptrtoint i32* %loadedptr to i64
+ %inttoptr = inttoptr i64 %ptrtoint to i32*
+ %switchtmp = icmp eq i32* %inttoptr, null
+ ret i1 %switchtmp
+
+; CHECK-LABEL: @dot_ref_s
+; CHECK-NEXT: entry-block:
+; CHECK-NEXT: ret i1 false
+}
+
+; Function Attrs: readonly uwtable
+define i64* @function(i64* noalias nocapture readonly dereferenceable(8)) {
+entry-block:
+ %loaded = load i64, i64* %0, align 8, !range !1
+ %inttoptr = inttoptr i64 %loaded to i64*
+ ret i64* %inttoptr
+; CHECK-LABEL: @function
+; CHECK: %{{.+}} = load i64*, i64** %{{.+}}, align 8, !nonnull
+}
+
+
+!0 = !{}
+!1 = !{i64 1, i64 140737488355327}
--
2.9.3
|
