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The code in AArch64A57FPLoadBalancing::scavengeRegister() to handle dead defs was not correctly handling aliased registers. E.g. if the dead def was of D2, then S2 was not being marked as unavailable, so it could potentially be used across a live-range in which it would be clobbered. Patch by Geoff Berry <gberry@codeaurora.org>! Phabricator: http://reviews.llvm.org/D10900 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241449 91177308-0d34-0410-b5e6-96231b3b80d8