| commit | 34167f99668ce4d4d6a1fb88453a8d5b56d16ed5 | [log] [tgz] |
|---|---|---|
| author | Matt Arsenault <Matthew.Arsenault@amd.com> | Fri Feb 21 22:11:51 2025 +0700 |
| committer | GitHub <noreply@github.com> | Fri Feb 21 22:11:51 2025 +0700 |
| tree | 6cbf97b75cb0f2e7cf38d401af04071ef242a523 | |
| parent | d578dbf9fdb4ce5cba13dda88393c2a67e61a30c [diff] |
RegAlloc: Fix verifier error after failed allocation (#119690) In some cases after reporting an allocation failure, this would fail the verifier. It picks the first allocatable register and assigns it, but didn't update the liveness appropriately. When VirtRegRewriter relied on the liveness to set kill flags, it would incorrectly add kill flags if there was another overlapping kill of the virtual register. We can't properly assign the register to an overlapping range, so break the liveness of the failing register (and any other interfering registers) instead. Give the virtual register dummy liveness by effectively deleting all the uses by setting them to undef. The edge case not tested here which I'm worried about is if the read of the register is a def of a subregister. I've been unable to come up with a test where this occurs. https://reviews.llvm.org/D122616
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