Subzero: Use cvttss2si and similar instead of cvtss2si for fp->int casts.

src/IceInstX8632.h

 //===- subzero/src/IceInstX8632.h - Low-level x86 instructions --*- 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 InstX8632 and OperandX8632 classes and
@@ skipping 845 matching lines @@
   operator=(const InstX8632Cmpxchg8b &) LLVM_DELETED_FUNCTION;
   virtual ~InstX8632Cmpxchg8b() {}
 };
 
 // Cvt instruction - wrapper for cvtsX2sY where X and Y are in {s,d,i}
 // as appropriate.  s=float, d=double, i=int.  X and Y are determined
 // from dest/src types.  Sign and zero extension on the integer
 // operand needs to be done separately.
 class InstX8632Cvt : public InstX8632 {
 public:
-  static InstX8632Cvt *create(Cfg *Func, Variable *Dest, Operand *Source) {
+  static InstX8632Cvt *create(Cfg *Func, Variable *Dest, Operand *Source,
+                              bool Trunc) {
     return new (Func->allocate<InstX8632Cvt>())
-        InstX8632Cvt(Func, Dest, Source);
+        InstX8632Cvt(Func, Dest, Source, Trunc);
   }
   virtual void emit(const Cfg *Func) const;
   virtual void dump(const Cfg *Func) const;
   static bool classof(const Inst *Inst) { return isClassof(Inst, Cvt); }
 
 private:
-  InstX8632Cvt(Cfg *Func, Variable *Dest, Operand *Source);
+  bool Trunc;
+  InstX8632Cvt(Cfg *Func, Variable *Dest, Operand *Source, bool Trunc);
   InstX8632Cvt(const InstX8632Cvt &) LLVM_DELETED_FUNCTION;
   InstX8632Cvt &operator=(const InstX8632Cvt &) LLVM_DELETED_FUNCTION;
   virtual ~InstX8632Cvt() {}
 };
 
 // cmp - Integer compare instruction.
 class InstX8632Icmp : public InstX8632 {
 public:
   static InstX8632Icmp *create(Cfg *Func, Operand *Src1, Operand *Src2) {
     return new (Func->allocate<InstX8632Icmp>())
@@ skipping 356 matching lines @@
 template <> void InstX8632Pmuludq::emit(const Cfg *Func) const;
 template <> void InstX8632Psll::emit(const Cfg *Func) const;
 template <> void InstX8632Psra::emit(const Cfg *Func) const;
 template <> void InstX8632Psub::emit(const Cfg *Func) const;
 template <> void InstX8632Sqrtss::emit(const Cfg *Func) const;
 template <> void InstX8632Subss::emit(const Cfg *Func) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINSTX8632_H