1 files changed, 24 insertions, 1 deletions
diff --git a/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp b/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
index 6a16e7955a1..525f2143190 100644
--- a/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
@@ -40,7 +40,9 @@ MipsLegalizerInfo::MipsLegalizerInfo(const MipsSubtarget &ST) {
       .minScalar(0, s32);
 
   getActionDefinitionsBuilder(G_CONSTANT)
-      .legalFor({s32});
+      .legalFor({s32})
+      .minScalar(0, s32)
+      .customFor({s64});
 
   getActionDefinitionsBuilder(G_GEP)
       .legalFor({{p0, s32}});
@@ -91,6 +93,27 @@ bool MipsLegalizerInfo::legalizeCustom(MachineInstr &MI,
     MI.eraseFromParent();
     break;
   }
+  case G_CONSTANT: {
+
+    unsigned Size = MRI.getType(MI.getOperand(0).getReg()).getSizeInBits();
+    const LLT sHalf = LLT::scalar(Size / 2);
+
+    const APInt &CImmValue = MI.getOperand(1).getCImm()->getValue();
+
+    unsigned ResLow = MRI.createGenericVirtualRegister(sHalf);
+    unsigned ResHigh = MRI.createGenericVirtualRegister(sHalf);
+    MIRBuilder.buildConstant(
+        ResLow, *ConstantInt::get(MI.getMF()->getFunction().getContext(),
+                                  CImmValue.trunc(Size / 2)));
+    MIRBuilder.buildConstant(
+        ResHigh, *ConstantInt::get(MI.getMF()->getFunction().getContext(),
+                                   CImmValue.lshr(Size / 2).trunc(Size / 2)));
+
+    MIRBuilder.buildMerge(MI.getOperand(0).getReg(), {ResHigh, ResLow});
+
+    MI.eraseFromParent();
+    break;
+  }
   default:
     return false;
   }