John McCall c346d94655 Fix the build and implementation of the 16-byte atomics for MSVC. ...

Credit for the cmake fix here goes to Saleem Abdulrasool.

The substantive fix is embarrassing; I didn't pay close attention
to the intrinsic's argument order and just assumed that the first
argument for the replacement value was the low half (the part
you'd find at index 0 if it were an array), but in fact it's the
high half (the part you'd find at index 1).

I also change the code to be much more reinterpret_casty, which
isolates the type-punning mostly "within" the intrinsic, and
which seems to match how other code uses it.

2020-12-04 01:51:29 -05:00

6.7 KiB

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