[PATCH] D84479: [X86] Detect if EFLAGs is live across XBEGIN pseudo instruction. Add it as livein to the basic blocks created when expanding the pseudo

[Craig Topper via Phabricator via llvm-commits]

craig.topper marked an inline comment as done.
craig.topper added inline comments.


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Comment at: llvm/lib/Target/X86/X86ISelLowering.cpp:31005
+
+  if (IsEFlagsLive(MI, MBB)) {
+    mainMBB->addLiveIn(X86::EFLAGS);
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djtodoro wrote:
> So this situation can happen *only* for `$EFLAGS`?
I don't know for sure.  I copied the code from EmitLoweredSelect where expanding CMOV pseudos has the same issue.


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https://reviews.llvm.org/D84479