GCS ACLE

[nsz-arm]

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[nsz-arm]

NIT maybe the draft could be dropped now from the name of the PR.

potential issues with current spec:

• gcs store intrinsic is missing
• const void vs void gcs (modified by bl/ret/... instructions, but normal c language stores don't work on it)
• intrinsic availability check (feature test macros no longer imply intrinsics)

[john-brawn-arm]

• gcs store intrinsic is missing

I'm not sure we need this. We can always add it later if there's a need.

• const void vs void gcs (modified by bl/ret/... instructions, but normal c language stores don't work on it)

I think we only really need the pointer to be non-const if we have a gcs store intrinsic. constness is only about if the user is permitted to write to something, so entries on the gcs stack being modified by bl/ret isn't relevant.

• intrinsic availability check (feature test macros no longer imply intrinsics)

Is this about https://github.com/ARM-software/acle/pull/214? I think the way GCS intrinsics are currently described is OK with regards to that (though I have a couple of comments on the wording).

[john-brawn-arm]

LGTM.