Subzero, MIPS32: Intrinsic calls Ctlz and Cttz for i64

src/IceTargetLoweringMIPS32.cpp

Index: src/IceTargetLoweringMIPS32.cpp
diff --git a/src/IceTargetLoweringMIPS32.cpp b/src/IceTargetLoweringMIPS32.cpp
index a6d9da81e5e86650c4b6362366409a6a6724ffe6..c49cc569b938209e14ffce386721af8da38b3e53 100644
--- a/src/IceTargetLoweringMIPS32.cpp
+++ b/src/IceTargetLoweringMIPS32.cpp
@@ -2632,6 +2632,12 @@ void TargetMIPS32::lowerCast(const InstCast *Instr) {
     break;
   }
   case InstCast::Bitcast: {
+    Operand *Src0 = Instr->getSrc(0);
+    if (DestTy == Src0->getType()) {
+      auto *Assign = InstAssign::create(Func, Dest, Src0);
+      lowerAssign(Assign);
+      return;
+    }
     switch (DestTy) {
     case IceType_NUM:
     case IceType_void:
@@ -3036,7 +3042,21 @@ void TargetMIPS32::lowerIntrinsicCall(const InstIntrinsicCall *Instr) {
       break;
     }
     case IceType_i64: {
-      UnimplementedLoweringError(this, Instr);
+      auto *T1 = I32Reg();
+      auto *T2 = I32Reg();
+      auto *T3 = I32Reg();
+      auto *T4 = I32Reg();
+      auto *DestLo = llvm::cast<Variable>(loOperand(Dest));
+      auto *DestHi = llvm::cast<Variable>(hiOperand(Dest));
+      Variable *SrcHiR = legalizeToReg(hiOperand(Src));
+      Variable *SrcLoR = legalizeToReg(loOperand(Src));
+      _clz(T1, SrcHiR);
+      _clz(T2, SrcLoR);
+      _addiu(T3, T2, 32);
+      _movn(T3, T1, SrcHiR);
+      _addiu(T4, getZero(), 0);
+      _mov(DestHi, T4);
+      _mov(DestLo, T3);
       break;
     }
     default:
@@ -3067,7 +3087,39 @@ void TargetMIPS32::lowerIntrinsicCall(const InstIntrinsicCall *Instr) {
       break;
     }
     case IceType_i64: {
-      UnimplementedLoweringError(this, Instr);
+      auto *THi1 = I32Reg();
+      auto *THi2 = I32Reg();
+      auto *THi3 = I32Reg();
+      auto *THi4 = I32Reg();
+      auto *THi5 = I32Reg();
+      auto *THi6 = I32Reg();
+      auto *TLo1 = I32Reg();
+      auto *TLo2 = I32Reg();
+      auto *TLo3 = I32Reg();
+      auto *TLo4 = I32Reg();
+      auto *TLo5 = I32Reg();
+      auto *TLo6 = I32Reg();
+      auto *TResHi = I32Reg();
+      auto *DestLo = llvm::cast<Variable>(loOperand(Dest));
+      auto *DestHi = llvm::cast<Variable>(hiOperand(Dest));
+      Variable *SrcHiR = legalizeToReg(hiOperand(Src));
+      Variable *SrcLoR = legalizeToReg(loOperand(Src));
+      _addiu(THi1, SrcHiR, -1);
+      _not(THi2, SrcHiR);
+      _and(THi3, THi2, THi1);
+      _clz(THi4, THi3);
+      _addiu(THi5, getZero(), 64);
+      _subu(THi6, THi5, THi4);
+      _addiu(TLo1, SrcLoR, -1);
+      _not(TLo2, SrcLoR);
+      _and(TLo3, TLo2, TLo1);
+      _clz(TLo4, TLo3);
+      _addiu(TLo5, getZero(), 32);
+      _subu(TLo6, TLo5, TLo4);
+      _movn(THi6, TLo6, SrcLoR);
+      _addiu(TResHi, getZero(), 0);
+      _mov(DestHi, TResHi);
+      _mov(DestLo, THi6);
       break;
     }
     default: