1 files changed, 11 insertions, 0 deletions
diff --git a/lib/CodeGen/GlobalISel/CSEMIRBuilder.cpp b/lib/CodeGen/GlobalISel/CSEMIRBuilder.cpp
index 461bc6038c2c..51a74793f029 100644
--- a/lib/CodeGen/GlobalISel/CSEMIRBuilder.cpp
+++ b/lib/CodeGen/GlobalISel/CSEMIRBuilder.cpp
@@ -162,6 +162,17 @@ MachineInstrBuilder CSEMIRBuilder::buildInstr(unsigned Opc,
       return buildConstant(DstOps[0], Cst->getSExtValue());
     break;
   }
+  case TargetOpcode::G_SEXT_INREG: {
+    assert(DstOps.size() == 1 && "Invalid dst ops");
+    assert(SrcOps.size() == 2 && "Invalid src ops");
+    const DstOp &Dst = DstOps[0];
+    const SrcOp &Src0 = SrcOps[0];
+    const SrcOp &Src1 = SrcOps[1];
+    if (auto MaybeCst =
+            ConstantFoldExtOp(Opc, Src0.getReg(), Src1.getImm(), *getMRI()))
+      return buildConstant(Dst, MaybeCst->getSExtValue());
+    break;
+  }
   }
   bool CanCopy = checkCopyToDefsPossible(DstOps);
   if (!canPerformCSEForOpc(Opc))