Add a genuine unary minus instruction to Crankshaft....

src/ia32/lithium-ia32.cc

 // Copyright 2011 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 1287 matching lines @@
 
 LInstruction* LChunkBuilder::DoBitNot(HBitNot* instr) {
   ASSERT(instr->value()->representation().IsInteger32());
   ASSERT(instr->representation().IsInteger32());
   LOperand* input = UseRegisterAtStart(instr->value());
   LBitNotI* result = new LBitNotI(input);
   return DefineSameAsFirst(result);
 }
 
 
+LInstruction* LChunkBuilder::DoNeg(HNeg* instr) {
+  Representation r = instr->representation();
+  if (r.IsInteger32()) {
+    LOperand* input = UseRegister(instr->value());
+    LNegI* result = new LNegI(input);
+    if (instr->CheckFlag(HValue::kBailoutOnMinusZero) ||
+        instr->CheckFlag(HValue::kCanOverflow)) {
+      AssignEnvironment(result);
+    }
+    return DefineSameAsFirst(result);
+  } else if (r.IsDouble()) {
+    LOperand* input = UseRegister(instr->value());
+    LOperand* temp = TempRegister();
+    return DefineSameAsFirst(new LNegD(input, temp));
+  } else {
+    ASSERT(r.IsTagged());
+    LOperand* input = UseFixed(instr->value(), eax);
+    LNegT* result = new LNegT(input);
+    return MarkAsCall(DefineFixed(result, eax), instr);
+  }
+}
+
+
 LInstruction* LChunkBuilder::DoBitOr(HBitOr* instr) {
   return DoBit(Token::BIT_OR, instr);
 }
 
 
 LInstruction* LChunkBuilder::DoBitXor(HBitXor* instr) {
   return DoBit(Token::BIT_XOR, instr);
 }
 
 
@@ skipping 671 matching lines @@
 LInstruction* LChunkBuilder::DoLeaveInlined(HLeaveInlined* instr) {
   HEnvironment* outer = current_block_->last_environment()->outer();
   current_block_->UpdateEnvironment(outer);
   return NULL;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32