[PATCH] D55909: [ExpandISelPseudos] Recompute liveins after introducing a new MBB.

[Tim Northover via Phabricator via llvm-commits]

t.p.northover added inline comments.


================
Comment at: lib/CodeGen/ExpandISelPseudos.cpp:75
+          for (MachineInstr &MI : reverse(*MBB)) {
+            for (MachineOperand &MOP : reverse(MI.operands())) {
+              if (!MOP.isReg() ||
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t.p.northover wrote:
> I think the logic needed here is a little more complicated. Fortunately, someone else has already been scarred for life by working it out (I expect) and you can just call `addLiveIns` from `LivePhysRegs.h`
Actually, shouldn't whatever's doing the splitting update liveness too? For all ExpandISelPseudos knows there could be a dozen new blocks scattered across the function that need updating.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D55909/new/

https://reviews.llvm.org/D55909