[PATCH] D101415: [CSSPGO] Fix an AV caused by a block that has only pseudo pseudo instructions.

[Hongtao Yu via Phabricator via llvm-commits]

hoy created this revision.
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Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D101415

Files:
  llvm/lib/CodeGen/RegAllocGreedy.cpp


Index: llvm/lib/CodeGen/RegAllocGreedy.cpp
===================================================================
--- llvm/lib/CodeGen/RegAllocGreedy.cpp
+++ llvm/lib/CodeGen/RegAllocGreedy.cpp
@@ -1324,10 +1324,10 @@
 
     // Abort if the spill cannot be inserted at the MBB' start
     MachineBasicBlock *MBB = MF->getBlockNumbered(Number);
-    if (!MBB->empty() &&
-        SlotIndex::isEarlierInstr(
-            LIS->getInstructionIndex(*MBB->getFirstNonDebugInstr()),
-            SA->getFirstSplitPoint(Number)))
+    auto FirstNonDebugInstr = MBB->getFirstNonDebugInstr();
+    if (FirstNonDebugInstr != MBB->end() &&
+        SlotIndex::isEarlierInstr(LIS->getInstructionIndex(*FirstNonDebugInstr),
+                                  SA->getFirstSplitPoint(Number)))
       return false;
     // Interference for the live-in value.
     if (Intf.first() <= Indexes->getMBBStartIdx(Number))


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