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Ignore empty unions in argument lowering on x86-32. From gcc struct layout tests. 

llvm-svn: 144944
This commit is contained in:
Eli Friedman 2011-11-18 00:28:11 +00:00
parent 841dd8861a
commit 9f061a37bb
2 changed files with 6 additions and 2 deletions
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4
clang/lib/CodeGen/TargetInfo.cpp
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@ -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

4
clang/test/CodeGen/x86_32-arguments-darwin.c
View File

@ -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()