Lower a few basic MIPS binops for i{8,16,32,64}.

src/IceInstMIPS32.cpp

 //===- subzero/src/IceInstMips32.cpp - Mips32 instruction implementation --===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 /// \file
@@ skipping 33 matching lines @@
 }
 
 const char *InstMIPS32::getWidthString(Type Ty) {
   (void)Ty;
   return "TBD";
 }
 
 template <> const char *InstMIPS32Addiu::Opcode = "addiu";
 template <> const char *InstMIPS32Lui::Opcode = "lui";
 template <> const char *InstMIPS32La::Opcode = "la";
-
+// Three-addr ops
+template <> const char *InstMIPS32Add::Opcode = "add";
+template <> const char *InstMIPS32And::Opcode = "and";
+template <> const char *InstMIPS32Mul::Opcode = "mul";
+template <> const char *InstMIPS32Or::Opcode = "or";
 template <> const char *InstMIPS32Ori::Opcode = "ori";
+template <> const char *InstMIPS32Sub::Opcode = "sub";
+template <> const char *InstMIPS32Xor::Opcode = "xor";
 
 InstMIPS32Mov::InstMIPS32Mov(Cfg *Func, Variable *Dest, Operand *Src)
     : InstMIPS32(Func, InstMIPS32::Mov, 2, Dest) {
   auto *Dest64 = llvm::dyn_cast<Variable64On32>(Dest);
   auto *Src64 = llvm::dyn_cast<Variable64On32>(Src);
 
   assert(Dest64 == nullptr || Src64 == nullptr);
 
   if (Dest64 != nullptr) {
     // this-> is needed below because there is a parameter named Dest.
@@ skipping 31 matching lines @@
     return;
   llvm_unreachable("Not yet implemented");
   (void)Func;
 }
 
 void InstMIPS32::emitUnaryopGPR(const char *Opcode, const InstMIPS32 *Inst,
                                 const Cfg *Func) {
   if (!BuildDefs::dump())
     return;
   Ostream &Str = Func->getContext()->getStrEmit();
-  // Type SrcTy = Inst->getSrc(0)->getType();
   Str << "\t" << Opcode << "\t";
   Inst->getDest()->emit(Func);
   Str << ", ";
   Inst->getSrc(0)->emit(Func);
 }
 
+void InstMIPS32::emitThreeAddr(const char *Opcode, const InstMIPS32 *Inst,
+                               const Cfg *Func) {
+  if (!BuildDefs::dump())
+    return;
+  Ostream &Str = Func->getContext()->getStrEmit();
+  assert(Inst->getSrcSize() == 2);
+  Str << "\t" << Opcode << "\t";
+  Inst->getDest()->emit(Func);
+  Str << ", ";
+  Inst->getSrc(0)->emit(Func);
+  Str << ", ";
+  Inst->getSrc(1)->emit(Func);
+}
+
 void InstMIPS32Ret::emit(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;
   assert(getSrcSize() > 0);
   Variable *RA = llvm::cast<Variable>(getSrc(0));
   assert(RA->hasReg());
   assert(RA->getRegNum() == RegMIPS32::Reg_RA);
   Ostream &Str = Func->getContext()->getStrEmit();
   Str << "\t"
       << "jr"
@@ skipping 97 matching lines @@
   Str << ", ";
   SrcLo->emit(Func);
   Str << ", ";
   SrcHi->emit(Func);
 }
 
 void InstMIPS32Mov::emitSingleDestSingleSource(const Cfg *Func) const {
   Ostream &Str = Func->getContext()->getStrEmit();
   // assert(Inst->getSrcSize() == 1);
   // Type SrcTy = Inst->getSrc(0)->getType();
-  Str << "\t"
-      << "move"
-      << "\t";
+  auto *Dest = getDest();

[Jim Stichnoth, 2015/11/05 05:21:28]

Please use Variable* here and Operand* in the next statement, instead of auto.

It's OK to use auto in the dyn_cast statement because otherwise the type is
being repeated.

[rkotlerimgtec, 2015/11/05 22:12:27]

Done.

+  auto *Src = getSrc(0);
+  auto *S = llvm::dyn_cast<Variable>(Src);
+  Str << "\t";
+  if (Dest->hasReg()) {
+    if (S && S->hasReg())
+      Str << "move";
+    else
+      Str << "lw";
+  } else {
+    if (S && S->hasReg()) {
+      Str << "sw";
+      Str << "\t";
+      getSrc(0)->emit(Func);
+      Str << ", ";
+      getDest()->emit(Func);
+      return;
+    } else
+      Str << "move";
+  }
+
+  Str << "\t";
   getDest()->emit(Func);
   Str << ", ";
   getSrc(0)->emit(Func);
 }
 
 } // end of namespace Ice