On Sun, 20 Jun 2021, Tyge Løvset wrote:
on win64 I get an undefined intrinsic symbol __faststorefence(). It
can be implemented as an mfence instruction, but I think microsoft
implements it with xchgl or similar
It appears to be implemented as lock or $0,(%rsp).
I would guess the reasoning that or with 0 is special-cased by the
processor as a no-op, so it doesn't actually perform a write, but the
lock still takes effect?
Regardless, I think it's a good idea to implement such intrinsics.
-E
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