Add scalar lowering for sqrt intrinsic.

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 152 matching lines @@
     Pop,
     Push,
     Pxor,
     Ret,
     Sar,
     Sbb,
     Shl,
     Shld,
     Shr,
     Shrd,
+    Sqrtss,
     Store,
     StoreQ,
     Sub,
     Subss,
     Test,
     Ucomiss,
     UD2,
     Xadd,
     Xor
   };
@@ skipping 637 matching lines @@
   virtual void dump(const Cfg *Func) const;
   static bool classof(const Inst *Inst) { return isClassof(Inst, Ret); }
 
 private:
   InstX8632Ret(Cfg *Func, Variable *Source);
   InstX8632Ret(const InstX8632Ret &) LLVM_DELETED_FUNCTION;
   InstX8632Ret &operator=(const InstX8632Ret &) LLVM_DELETED_FUNCTION;
   virtual ~InstX8632Ret() {}
 };
 
+// Sqrtss - Scalar sqrt of a float or double.
+class InstX8632Sqrtss : public InstX8632 {
+public:
+  static InstX8632Sqrtss *create(Cfg *Func, Variable *Dest, Operand *Source) {
+    return new (Func->allocate<InstX8632Sqrtss>())
+        InstX8632Sqrtss(Func, Dest, Source);
+  }
+  virtual void emit(const Cfg *Func) const;
+  virtual void dump(const Cfg *Func) const;
+  static bool classof(const Inst *Inst) { return isClassof(Inst, Sqrtss); }
+
+private:
+  InstX8632Sqrtss(Cfg *Func, Variable *Dest, Operand *Source);
+  InstX8632Sqrtss(const InstX8632Sqrtss &) LLVM_DELETED_FUNCTION;
+  InstX8632Sqrtss &operator=(const InstX8632Sqrtss &) LLVM_DELETED_FUNCTION;
+  virtual ~InstX8632Sqrtss() {}
+};
+
 // Exchanging Add instruction.  Exchanges the first operand (destination
 // operand) with the second operand (source operand), then loads the sum
 // of the two values into the destination operand. The destination may be
 // a register or memory, while the source must be a register.
 //
 // Both the dest and source are updated. The caller should then insert a
 // FakeDef to reflect the second udpate.
 class InstX8632Xadd : public InstX8632 {
 public:
   static InstX8632Xadd *create(Cfg *Func, Operand *Dest, Variable *Source,
@@ skipping 10 matching lines @@
 
   InstX8632Xadd(Cfg *Func, Operand *Dest, Variable *Source, bool Locked);
   InstX8632Xadd(const InstX8632Xadd &) LLVM_DELETED_FUNCTION;
   InstX8632Xadd &operator=(const InstX8632Xadd &) LLVM_DELETED_FUNCTION;
   virtual ~InstX8632Xadd() {}
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINSTX8632_H