http://llvm.org/bugs/show_bug.cgi?id=20278
Bug ID: 20278
Summary: MS ABI: fastcall methods with struct return are broken
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
We have two register parameters and we are failing to account for the fact that
the sret parameter consumes one register slot.
This program fails to link and run together with MSVC:
struct SRet {
int x;
SRet(int x) : x(x) {}
};
struct A {
virtual SRet __fastcall f(int);
};
#ifdef CONFIG_1
SRet A::f(int x) {
return SRet(x);
}
#else
int main() {
A a;
SRet x = a.f(42);
return x.x;
}
#endif
It should exit 42.
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