Add support for vector types and vector constants.

src/IceTargetLoweringX8632.h

 //===- subzero/src/IceTargetLoweringX8632.h - x86-32 lowering ---*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the TargetLoweringX8632 class, which
@@ skipping 177 matching lines @@
     Context.insert(InstX8632Imul::create(Func, Dest, Src0));
   }
   void _mfence() { Context.insert(InstX8632Mfence::create(Func)); }
   // If Dest=NULL is passed in, then a new variable is created, marked
   // as infinite register allocation weight, and returned through the
   // in/out Dest argument.
   void _mov(Variable *&Dest, Operand *Src0,
             int32_t RegNum = Variable::NoRegister) {
     if (Dest == NULL) {
       Dest = legalizeToVar(Src0, false, RegNum);
+    } else if (typeNumElements(Dest->getType()) > 1) {
+      Context.insert(InstX8632Movp::create(Func, Dest, Src0));

[jvoung (off chromium), 2014/06/26 00:45:41]

I wonder if this should just be a separate _movp() function.

Basically, are there cases where you *already* know that typeNumElements() > 1,
in which case you can just call _movp() and avoid having _mov() do a check.

[wala, 2014/06/26 17:32:42]

I'll add a _movp function. However, there are a few cases where a type-agnostic
_mov (which would emit the correct code to copy values between two registers or
between a register and memory, regardless of the type of the operands) would be
nice to have to keep the lowering code simple (such in in legalize or
setArgOffsetAndCopy).

[jvoung (off chromium), 2014/06/26 23:33:46]

Okay, yeah I was worried there might be some recursion w/ _mov and it's use to
legalizeToVar() when Dest is NULL, and which might lead back to _mov, and it
would all need to handle the types correctly.

     } else {
       Context.insert(InstX8632Mov::create(Func, Dest, Src0));
     }
   }
   void _movq(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Movq::create(Func, Dest, Src0));
   }
   void _movsx(Variable *Dest, Operand *Src0) {
     Context.insert(InstX8632Movsx::create(Func, Dest, Src0));
   }
@@ skipping 73 matching lines @@
   llvm::SmallBitVector RegsUsed;
   SizeT NextLabelNumber;
   bool ComputedLiveRanges;
   VarList PhysicalRegisters;
   static IceString RegNames[];
 
 private:
   TargetX8632(const TargetX8632 &) LLVM_DELETED_FUNCTION;
   TargetX8632 &operator=(const TargetX8632 &) LLVM_DELETED_FUNCTION;
   virtual ~TargetX8632() {}
-  template <typename T> void emitConstantPool() const;
+  template <typename T> void emitScalarConstantPool() const;
+  void emitVectorConstantPool() const;
 };
 
+template <> void ConstantInteger::emit(GlobalContext *Ctx) const;
 template <> void ConstantFloat::emit(GlobalContext *Ctx) const;
 template <> void ConstantDouble::emit(GlobalContext *Ctx) const;
+template <> void ConstantVector::emit(GlobalContext *Ctx) const;
+template <> void ConstantBitVector::emit(GlobalContext *Ctx) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX8632_H