[PATCH] D61671: X86WinAllocaExpander: Drop code looking through register copies (PR41786)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added inline comments.


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Comment at: llvm/lib/Target/X86/X86WinAllocaExpander.cpp:269
+  if (MRI->use_empty(AmountReg)) {
     MachineInstr *AmountDef = MRI->getUniqueVRegDef(AmountReg);
     AmountDef->eraseFromParent();
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Can this be null? We were testing for it before and still do above.


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  https://reviews.llvm.org/D61671/new/

https://reviews.llvm.org/D61671