From 5a4d35247f55dae6dd0d5ad349ecadbbea0b4572 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Fri, 18 Nov 2011 00:28:11 +0000
Subject: [PATCH] Ignore empty unions in argument lowering on x86-32. From gcc
struct layout tests.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144944 91177308-0d34-0410-b5e6-96231b3b80d8
---
lib/CodeGen/TargetInfo.cpp | 4 ++--
test/CodeGen/x86_32-arguments-darwin.c | 4 ++++
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/lib/CodeGen/TargetInfo.cpp b/lib/CodeGen/TargetInfo.cpp
index c3d5ee19d68..b23ae304a82 100644
--- a/lib/CodeGen/TargetInfo.cpp
+++ b/lib/CodeGen/TargetInfo.cpp
@@ -700,8 +700,8 @@ ABIArgInfo X86_32ABIInfo::classifyArgumentType(QualType Ty) const {
return getIndirectResult(Ty);
}
- // Ignore empty structs.
- if (Ty->isStructureType() && getContext().getTypeSize(Ty) == 0)
+ // Ignore empty structs/unions.
+ if (Ty->isRecordType() && getContext().getTypeSize(Ty) == 0)
return ABIArgInfo::getIgnore();
// Expand small (<= 128-bit) record types when we know that the stack layout
diff --git a/test/CodeGen/x86_32-arguments-darwin.c b/test/CodeGen/x86_32-arguments-darwin.c
index c3af7fbc047..b31262fc96c 100644
--- a/test/CodeGen/x86_32-arguments-darwin.c
+++ b/test/CodeGen/x86_32-arguments-darwin.c
@@ -280,3 +280,7 @@ void f56(char a0, struct s56_0 a1,
// CHECK: call void @f57(
struct s57 { _Complex int x; };
void f57(struct s57 x) {} void f57a(void) { f57((struct s57){1}); }
+
+union u58 {};
+void f58(union u58 x) {}
+// CHECK: define void @f58()
--
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