[PATCH] D82249: [HWASan] Disable GlobalISel/FastISel for HWASan Globals.

[Mitch Phillips via Phabricator via cfe-commits]

hctim added a comment.

In D82249#2110010 <https://reviews.llvm.org/D82249#2110010>, @arsenm wrote:

> I don't follow. It no longer falls back, so what is the problem?


HWASan-globals end up with an address that's outside of the code model (due to the tag), so the normal instruction sequence of `adrp + mov` or `adrp + ldr/str (with folded imm)` isn't adequate. In SelectionDAGISel, we emit a `movk` as well after the `adrp` to capture the top 16 bits. We need to do the same for GlobalISel. This is a temporary workaround to fix HWASan at `-O0` while I go and add support for adding the tagged-address lowering in GlobalISel.


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https://reviews.llvm.org/D82249