[PATCH] D151406: [Hexagon] Check if register is non-null before calling subregs_inclusive

[Sergei Barannikov via Phabricator via llvm-commits]

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D151036 <https://reviews.llvm.org/D151036> adds an assertions that prohibits iterating over sub- and
super-registers of a null register. This is already the case when
iterating over register units of a null register, and worked by
accident for sub- and super-registers.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151406

Files:
  llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp


Index: llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
===================================================================
--- llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
+++ llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
@@ -307,6 +307,9 @@
           return true;
         if (MO.isReg()) {
           Register R = MO.getReg();
+          // Debug instructions may refer to $noreg.
+          if (!R)
+            continue;
           // Virtual registers will need scavenging, which then may require
           // a stack slot.
           if (R.isVirtual())


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