[llvm] b1edfa1 - [SelectionDAG] Prevent converting a virtual register to an MCRegister. (#122857)

[via llvm-commits]

Author: Craig Topper
Date: 2025-01-14T10:03:19-08:00
New Revision: b1edfa1c07dc6ac42205b3397304e5b5f77617a1

URL: https://github.com/llvm/llvm-project/commit/b1edfa1c07dc6ac42205b3397304e5b5f77617a1
DIFF: https://github.com/llvm/llvm-project/commit/b1edfa1c07dc6ac42205b3397304e5b5f77617a1.diff

LOG: [SelectionDAG] Prevent converting a virtual register to an MCRegister. (#122857)

I believe the goal is that MCRegister is only for physical registers.

Added: 
    

Modified: 
    llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index d64a90bcaae7da..b416e98fe61a8b 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -706,6 +706,8 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
       continue;
 
     // If Reg is live-in then update debug info to track its copy in a vreg.
+    if (!Reg.isPhysical())
+      continue;
     DenseMap<MCRegister, Register>::iterator LDI = LiveInMap.find(Reg);
     if (LDI != LiveInMap.end()) {
       assert(!hasFI && "There's no handling of frame pointer updating here yet "