https://bugs.llvm.org/show_bug.cgi?id=44641
Bug ID: 44641
Summary: GPF when passing a non-aligned struct to a
__declspec(align) typedef
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: alexandre.ga...@ubisoft.com
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk, r...@google.com
Clang does not complain when a non-aligned instance is assigned to aligned
typedef'd type (repro below).
I think at least a warning would be nice (if not, an error).
MSVC and GCC handle this by doing a unaligned load.
https://godbolt.org/z/62HzmJ
--------------------------------
// a.h
struct Vector4 { float v[4]; };
typedef __declspec(align(16)) Vector4 AlignVector4;
struct A {
AlignVector4 vec;
void SetVec(const AlignVector4& v) { vec = v; }
};
struct B {
bool b;
Vector4 vec;
};
--------------------------------
// a.cpp
#include "a.h"
int f(A& a, const B& b) {
a.SetVec(b.vec);
return (int)a.vec.v[0];
}
--------------------------------
// main.cpp
#include "a.h"
int f(A& a, const B& b);
int main() {
A a; B b;
return f(a, b);
}
--------------------------------
// Build:
// clang-cl a.cpp /O2 /c /MT
// clang-cl main.cpp /c /MT
// lld-link a.obj main.obj /entry:main /subsystem:console
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