Add constant blinding/pooling option for X8632 code translation

src/IceOperand.cpp

 //===- subzero/src/IceOperand.cpp - High-level operand implementation -----===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the Operand class and its target-independent
@@ skipping 473 matching lines @@
 Ostream &operator<<(Ostream &Str, const RegWeight &W) {
   if (!ALLOW_DUMP)
     return Str;
   if (W.getWeight() == RegWeight::Inf)
     Str << "Inf";
   else
     Str << W.getWeight();
   return Str;
 }
 
+// =========== Immediate Randomization and Pooling routines ==============
+// Immediates randomization and pooling threshold, we should not
+// randomize or pool small constants e.g. 2,4 etc.
+static const uint32_t X86_INT_IMMEDIATE_RANDOMIZATION_THRESHOLD = 0x1;
+
+// Specialization of the template member function for ConstantInteger32
+template <>
+bool ConstantInteger32::shouldBeRandomizedOrPooled(const GlobalContext *Ctx) {
+  if (Ctx->getFlags().getRandomizeAndPoolImmediatesOption() == RPI_None)
+    return false;
+  if (getType() != IceType_i32 && getType() != IceType_i16 &&
+      getType() != IceType_i8)
+    return false;
+  // if(getType() != IceType_i32)  return false;
+  // The Following checks if the signed representation of Value is between
+  // -THRESHOLD/2 and +THRESHOLD/2
+  bool largerThanThreshold =
+      X86_INT_IMMEDIATE_RANDOMIZATION_THRESHOLD / 2 + Value >=
+      X86_INT_IMMEDIATE_RANDOMIZATION_THRESHOLD;
+  return largerThanThreshold;
+}
+
 } // end of namespace Ice