Subzero, MIPS32: Handling fptrunc and fpext casting

src/IceTargetLoweringMIPS32.cpp

 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// \brief Implements the TargetLoweringMIPS32 class, which consists almost
@@ skipping 2000 matching lines @@
   }
   case InstCast::Trunc: {
     if (Src0Ty == IceType_i64)
       Src0 = loOperand(Src0);
     Variable *Src0R = legalizeToReg(Src0);
     Variable *T = makeReg(DestTy);
     _mov(T, Src0R);
     _mov(Dest, T);
     break;
   }
-  case InstCast::Fptrunc:
-    // Use _cvt_d_s
-    UnimplementedLoweringError(this, Instr);
-    break;
-  case InstCast::Fpext: {
-    // Use _cvt_s_d
-    UnimplementedLoweringError(this, Instr);
+  case InstCast::Fptrunc: {
+    assert(Dest->getType() == IceType_f32);
+    assert(Src0->getType() == IceType_f64);
+    auto *DestR = legalizeToReg(Dest);
+    auto *Src0R = legalizeToReg(Src0);
+    _cvt_s_d(DestR, Src0R);
+    _mov(Dest, DestR);
     break;
   }
-  case InstCast::Fptosi:
+  case InstCast::Fpext: {
+    assert(Dest->getType() == IceType_f64);
+    assert(Src0->getType() == IceType_f32);
+    auto *DestR = legalizeToReg(Dest);
+    auto *Src0R = legalizeToReg(Src0);
+    _cvt_d_s(DestR, Src0R);
+    _mov(Dest, DestR);
+    break;
+  }
+  case InstCast::Fptosi: //
     UnimplementedLoweringError(this, Instr);
     break;
   case InstCast::Fptoui:
     UnimplementedLoweringError(this, Instr);
     break;
-  case InstCast::Sitofp:
+  case InstCast::Sitofp: //
     UnimplementedLoweringError(this, Instr);
     break;
   case InstCast::Uitofp: {
     UnimplementedLoweringError(this, Instr);
     break;
   }
   case InstCast::Bitcast: {
     UnimplementedLoweringError(this, Instr);
     break;
   }
@@ skipping 682 matching lines @@
   Str << "\t.set\t"
       << "nomips16\n";
 }
 
 SmallBitVector TargetMIPS32::TypeToRegisterSet[RCMIPS32_NUM];
 SmallBitVector TargetMIPS32::TypeToRegisterSetUnfiltered[RCMIPS32_NUM];
 SmallBitVector TargetMIPS32::RegisterAliases[RegMIPS32::Reg_NUM];
 
 } // end of namespace MIPS32
 } // end of namespace Ice