Add signed/unsigned 8-bit and 16-bit Representations

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2838 matching lines @@
           : new(zone) Range();
       result->Shl(c->Integer32Value());
       return result;
     }
   }
   return HValue::InferRange(zone);
 }
 
 
 Range* HLoadNamedField::InferRange(Zone* zone) {
-  if (access().representation().IsByte()) {
-    return new(zone) Range(0, 255);
+  if (access().representation().IsInteger8()) {
+    return new(zone) Range(kMinInteger8, kMaxInteger8);
+  }
+  if (access().representation().IsUInteger8()) {
+    return new(zone) Range(kMinUInteger8, kMaxUInteger8);
+  }
+  if (access().representation().IsInteger16()) {
+    return new(zone) Range(kMinInteger16, kMaxInteger16);
+  }
+  if (access().representation().IsUInteger16()) {
+    return new(zone) Range(kMinUInteger16, kMaxUInteger16);
   }
   if (access().IsStringLength()) {
     return new(zone) Range(0, String::kMaxLength);
   }
   return HValue::InferRange(zone);
 }
 
 
 Range* HLoadKeyed::InferRange(Zone* zone) {
   switch (elements_kind()) {
+    case EXTERNAL_BYTE_ELEMENTS:
+      return new(zone) Range(kMinInteger8, kMaxInteger8);
+    case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
     case EXTERNAL_PIXEL_ELEMENTS:
-      return new(zone) Range(0, 255);
-    case EXTERNAL_BYTE_ELEMENTS:
-      return new(zone) Range(-128, 127);
-    case EXTERNAL_UNSIGNED_BYTE_ELEMENTS:
-      return new(zone) Range(0, 255);
+      return new(zone) Range(kMinUInteger8, kMaxUInteger8);
     case EXTERNAL_SHORT_ELEMENTS:
-      return new(zone) Range(-32768, 32767);
+      return new(zone) Range(kMinInteger16, kMaxInteger16);
     case EXTERNAL_UNSIGNED_SHORT_ELEMENTS:
-      return new(zone) Range(0, 65535);
+      return new(zone) Range(kMinUInteger16, kMaxUInteger16);
     default:
       return HValue::InferRange(zone);
   }
 }
 
 
 void HCompareGeneric::PrintDataTo(StringStream* stream) {
   stream->Add(Token::Name(token()));
   stream->Add(" ");
   HBinaryOperation::PrintDataTo(stream);
@@ skipping 1407 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal