Harmony: optimize Math.clz32.

src/a64/lithium-a64.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 2359 matching lines @@
       LOperand* temp = FixedTemp(d24);  // Choosen arbitrarily.
       LMathRound* result = new(zone()) LMathRound(input, temp);
       return AssignEnvironment(DefineAsRegister(result));
     }
     case kMathSqrt: {
       ASSERT(instr->representation().IsDouble());
       ASSERT(instr->value()->representation().IsDouble());
       LOperand* input = UseRegisterAtStart(instr->value());
       return DefineAsRegister(new(zone()) LMathSqrt(input));
     }
+    case kMathClz32: {
+      ASSERT(instr->representation().IsInteger32());
+      ASSERT(instr->value()->representation().IsInteger32());
+      LOperand* input = UseRegisterAtStart(instr->value());
+      return DefineAsRegister(new(zone()) LMathClz32(input));
+    }
     default:
       UNREACHABLE();
       return NULL;
   }
 }
 
 
 LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
   // Use an index that corresponds to the location in the unoptimized frame,
   // which the optimized frame will subsume.
@@ skipping 50 matching lines @@
 
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegister(instr->function());
   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function);
   return AssignEnvironment(DefineAsRegister(result));
 }
 
 
 } }  // namespace v8::internal