note about masks for reserved bits in the ACPERM mask #551
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I think this is the sensible behaviour here. I can see the argument that requesting to clear something that doesn't exist should tag clear but I'm not sure that is useful for software. If your software depends on being able to clear the level bits you can just check that it was possible to actually clear it (once on program startup) using GCPERM+ACPERM+GCPERM rather than rely on implicit tag invalidation. |
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Would like to hear from @LawrenceEsswood / @jrtc27 / @nwf as well though. |
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I disagree. This is an invalid request and ignoring it could silently degrade security. See my comment on the issue. |
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Fixes #548
This affects spec version 0.9.5