https://github.com/Fznamznon created
https://github.com/llvm/llvm-project/pull/112218
9ad72df55cb74b29193270c28f6974d2af8e0b71 added split of _BitInt constants when
required. Before folding back, check that the constant exists.
>From 60cda89e05cdd922ec762d8be6142936442fb505 Mon Sep 17 00:00:00 2001
From: "Podchishchaeva, Mariya" <mariya.podchishcha...@intel.com>
Date: Mon, 14 Oct 2024 07:29:05 -0700
Subject: [PATCH] [clang] Fix crash related to _BitInt constant split
9ad72df55cb74b29193270c28f6974d2af8e0b71 added split of _BitInt
constants when required. Before folding back, check that the constant
exists.
---
clang/lib/CodeGen/CGDecl.cpp | 2 +-
clang/test/CodeGenCXX/ext-int.cpp | 15 +++++++++++++++
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/clang/lib/CodeGen/CGDecl.cpp b/clang/lib/CodeGen/CGDecl.cpp
index 30af9268b30e2e..1d0660292cecc1 100644
--- a/clang/lib/CodeGen/CGDecl.cpp
+++ b/clang/lib/CodeGen/CGDecl.cpp
@@ -1945,7 +1945,7 @@ void CodeGenFunction::EmitAutoVarInit(const
AutoVarEmission &emission) {
replaceUndef(CGM, isPattern, constant));
}
- if (D.getType()->isBitIntType() &&
+ if (constant && D.getType()->isBitIntType() &&
CGM.getTypes().typeRequiresSplitIntoByteArray(D.getType())) {
// Constants for long _BitInt types are split into individual bytes.
// Try to fold these back into an integer constant so it can be stored
diff --git a/clang/test/CodeGenCXX/ext-int.cpp
b/clang/test/CodeGenCXX/ext-int.cpp
index 7758e92d74a05f..a098f5a9057c0e 100644
--- a/clang/test/CodeGenCXX/ext-int.cpp
+++ b/clang/test/CodeGenCXX/ext-int.cpp
@@ -614,3 +614,18 @@ void TBAATest(_BitInt(sizeof(int) * 8) ExtInt,
// NewStructPathTBAA-DAG: ![[EXTINT_TBAA_ROOT]] = !{![[CHAR_TBAA_ROOT]], i64
4, !"_BitInt(32)"}
// NewStructPathTBAA-DAG: ![[EXTINT6_TBAA]] = !{![[EXTINT6_TBAA_ROOT:.+]],
![[EXTINT6_TBAA_ROOT]], i64 0, i64 1}
// NewStructPathTBAA-DAG: ![[EXTINT6_TBAA_ROOT]] = !{![[CHAR_TBAA_ROOT]], i64
1, !"_BitInt(6)"}
+
+namespace A {
+template <int N> struct S {
+ using T = _BitInt(N);
+ T Data;
+};
+template <int N> void foo(S<N> B) {
+ const auto Var = B.Data;
+}
+
+void bar() {
+ S<2080> a;
+ foo(a);
+}
+}
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