https://bugs.llvm.org/show_bug.cgi?id=48875
Bug ID: 48875
Summary: Wrong size of struct with overaligned bitfield
Product: clang
Version: 11.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C
Assignee: unassignedclangb...@nondot.org
Reporter: ju.o...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Consider
struct Y {
__declspec(align(128)) int i:1;
};
struct Z {
char c;
struct Y y;
};
int f(void) {
return _Alignof(struct Y);
}
int g(void) {
return sizeof(struct Z);
}
int h(void) {
return &((struct Z *)0)->y; // offsetof(struct Z, y)
}
MSVC returns
128
16
8
clang returns
128
256
128
on the aarch64-pc-windows-msvc target.
Apparently, on ARM targets, bitfields in structs increase the alignment of the
struct to at most 8 bytes. Even though _Alignof incorrectly returns a higher
value.
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