Reading this, one interesting tidbit is that the result of address masking is NOT speculated on – so does this close off the vector of reading between PittSFIeld-style SFI regions (including NaCl)?https://webkit.org/blog/8048/what-spectre-and-meltdown-mean-for-webkit/ …
I think they're misusing terminology. I would not describe that property as "not speculating on bit masking".
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It just means data dependencies are honored, and addresses are not guessed based on omission of incomplete dependencies.
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