[AIEX] Bail out from waw rewriter for spilled register

Xilinx · Feb 18, 2025 · ad9e67d · ad9e67d
1 parent 42774ee
commit ad9e67d
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Showing 2 changed files with 303 additions and 1 deletion.
diff --git a/llvm/lib/Target/AIE/AIEWawRegRewriter.cpp b/llvm/lib/Target/AIE/AIEWawRegRewriter.cpp
@@ -253,7 +253,12 @@ bool AIEWawRegRewriter::renameMBBPhysRegs(const MachineBasicBlock *MBB) {
       // WAW dependency resolution
       if (LastVRegDef[Reg] != &MI)
         continue;
-
+      // See llvm bug #48911.
+      // Skip reassign if a register has originated from InlineSpiller.
+      // FIXME: Remove the workaround when bug #48911 is fixed.
+      if (VRM->getPreSplitReg(Reg)) {
+        continue;
+      }
       if (isWorthRenaming(Reg, VRegWithCopies)) {
         assert(VRM->hasPhys(Reg));
         MCRegister AssignedPhysReg = VRM->getPhys(Reg);