Fix sign/zero extended value of immediate type

Change-Id: Ie791dc7a29da990c70fc817aa20ca5f44941186e

Author: pratikashar

visa/Gen4_IR.cpp

@@ -6191,6 +6191,53 @@ G4_Imm::emitAutoFmt(std::ostream& output)
     }
 }
 
+int64_t G4_Imm::typecastVals(int64_t value, G4_Type type)
+{
+    int64_t retVal = 0;
+    switch (type)
+    {
+    case Type_UD:
+    case Type_UV:
+    case Type_VF:
+    {
+        retVal = (int64_t)((unsigned int)value);
+        break;
+    }
+    case Type_D:
+    case Type_V:
+    {
+        retVal = (int64_t)((int)value);
+        break;
+    }
+    case Type_UW:
+    {
+        retVal = (int64_t)((uint16_t)value);
+        break;
+    }
+    case Type_W:
+    {
+        retVal = (int64_t)((int16_t)value);
+        break;
+    }
+    case Type_UB:
+    {
+        retVal = (int64_t)((uint8_t)value);
+        break;
+    }
+    case Type_B:
+    {
+        retVal = (int64_t)((int8_t)value);
+        break;
+    }
+    default:
+    {
+        // Dont do float conversions
+        retVal = value;
+    }
+    }
+    return retVal;
+}
+
 G4_RegVar *
 G4_RegVarTransient::getNonTransientBaseRegVar ()
 {

visa/Gen4_IR.hpp

@@ -2480,6 +2480,7 @@ class G4_Imm : public G4_Operand
 
     static bool isInTypeRange(int64_t imm, G4_Type ty);
 
+    static int64_t typecastVals(int64_t value, G4_Type type);
 };
 
 class G4_Reloc_Imm : public G4_Imm

visa/Optimizer.cpp

@@ -2950,7 +2950,9 @@ void Optimizer::newLocalCopyPropagation()
                 // replace use with def
                 if (src->isImm())
                 {
-                    G4_Imm* newImm = builder.createImm(src->asImm()->getImm(),
+                    auto newImmVal = G4_Imm::typecastVals(src->asImm()->getImm(), 
+                        propType);
+                    G4_Imm* newImm = builder.createImm(newImmVal,
                         propType);
                     G4_SrcModifier modifier = use->asSrcRegRegion()->getModifier();
                     if (modifier != Mod_src_undef)