[PATCH] D137407: [GlobalIsel] Handle carry output generated in narrowScalarAddSub legalize action

[Yashwant Singh via Phabricator via llvm-commits]

yassingh created this revision.
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Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137407

Files:
  llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp


Index: llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
===================================================================
--- llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
+++ llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
@@ -5122,6 +5122,14 @@
               makeArrayRef(DstRegs).take_front(NarrowParts), LeftoverTy,
               makeArrayRef(DstRegs).drop_front(NarrowParts));
 
+  // Replace the usage of carry genated in original instruction
+  // with carry output generated after sequence of additions
+  auto &MF = *MI.getParent()->getParent();
+  const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
+  for (MachineInstr &Use : MRI.use_instructions(CarryDst)) {
+    Use.substituteRegister(CarryDst, CarryIn, 0, *TRI);
+  }
+
   MI.eraseFromParent();
   return Legalized;
 }


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