Replaced unary negation by multiplication with -1.

src/hydrogen.cc

 // Copyright 2013 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 1700 matching lines @@
       Add<HStoreKeyed>(object_elements, key_constant, value, kind);
     }
   }
 
   return object;
 }
 
 
 HInstruction* HGraphBuilder::BuildUnaryMathOp(
     HValue* input, Handle<Type> type, Token::Value operation) {
+  ASSERT_EQ(Token::BIT_NOT, operation);
   // We only handle the numeric cases here
   type = handle(
       Type::Intersect(type, handle(Type::Number(), isolate())), isolate());
-
-  switch (operation) {
-    default:
-      UNREACHABLE();
-    case Token::SUB: {
-        HInstruction* instr =
-            NewUncasted<HMul>(input, graph()->GetConstantMinus1());
-        Representation rep = Representation::FromType(type);
-        if (type->Is(Type::None())) {
-          Add<HDeoptimize>(Deoptimizer::SOFT);
-        }
-        if (instr->IsBinaryOperation()) {
-          HBinaryOperation* binop = HBinaryOperation::cast(instr);
-          binop->set_observed_input_representation(1, rep);
-          binop->set_observed_input_representation(2, rep);
-        }
-        return instr;
-      }
-    case Token::BIT_NOT:
-      if (type->Is(Type::None())) {
-        Add<HDeoptimize>(Deoptimizer::SOFT);
-      }
-      return New<HBitNot>(input);
+  if (type->Is(Type::None())) {
+    Add<HDeoptimize>(Deoptimizer::SOFT);
   }
+  return New<HBitNot>(input);
 }
 
 
 void HGraphBuilder::BuildCompareNil(
     HValue* value,
     Handle<Type> type,
     int position,
     HIfContinuation* continuation) {
   IfBuilder if_nil(this, position);
   bool needs_or = false;
@@ skipping 5455 matching lines @@
 
 
 void HOptimizedGraphBuilder::VisitUnaryOperation(UnaryOperation* expr) {
   ASSERT(!HasStackOverflow());
   ASSERT(current_block() != NULL);
   ASSERT(current_block()->HasPredecessor());
   switch (expr->op()) {
     case Token::DELETE: return VisitDelete(expr);
     case Token::VOID: return VisitVoid(expr);
     case Token::TYPEOF: return VisitTypeof(expr);
-    case Token::SUB: return VisitSub(expr);
     case Token::BIT_NOT: return VisitBitNot(expr);
     case Token::NOT: return VisitNot(expr);
     default: UNREACHABLE();
   }
 }
 
 
 void HOptimizedGraphBuilder::VisitDelete(UnaryOperation* expr) {
   Property* prop = expr->expression()->AsProperty();
   VariableProxy* proxy = expr->expression()->AsVariableProxy();
@@ skipping 42 matching lines @@
 
 void HOptimizedGraphBuilder::VisitTypeof(UnaryOperation* expr) {
   CHECK_ALIVE(VisitForTypeOf(expr->expression()));
   HValue* value = Pop();
   HValue* context = environment()->context();
   HInstruction* instr = new(zone()) HTypeof(context, value);
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
-void HOptimizedGraphBuilder::VisitSub(UnaryOperation* expr) {
-  CHECK_ALIVE(VisitForValue(expr->expression()));
-  Handle<Type> operand_type = expr->expression()->bounds().lower;
-  HValue* value = TruncateToNumber(Pop(), &operand_type);
-  HInstruction* instr = BuildUnaryMathOp(value, operand_type, Token::SUB);
-  return ast_context()->ReturnInstruction(instr, expr->id());
-}
-
-
 void HOptimizedGraphBuilder::VisitBitNot(UnaryOperation* expr) {
   CHECK_ALIVE(VisitForValue(expr->expression()));
   Handle<Type> operand_type = expr->expression()->bounds().lower;
   HValue* value = TruncateToNumber(Pop(), &operand_type);
   HInstruction* instr = BuildUnaryMathOp(value, operand_type, Token::BIT_NOT);
   return ast_context()->ReturnInstruction(instr, expr->id());
 }
 
 
 void HOptimizedGraphBuilder::VisitNot(UnaryOperation* expr) {
@@ skipping 2425 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal