mstorsjo wrote:
> Microsoft bit-field layout didn't break an overly-specific regression test
> but rendered unusable double to string conversion. The culprit was the
> following snippet:
>
> ```c++
> union Extractor {
> double value;
> struct {
> bool sign : 1;
> u32 exponent : 11;
> u64 mantissa : 52;
> };
> };
> ```
>
> According to MSVC ABI, there should be padding between fields. I hope you
> agree that this is not an intuitive and expected behavior.
It is indeed an unexpected thing. However it is possible to work around it for
all these cases; if you declare the inner structure like this:
```
struct {
u64 sign : 1;
u64 exponent : 11;
u64 mantissa : 52;
};
```
Then there will be no extra padding between the fields.
https://github.com/llvm/llvm-project/pull/71148
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