Esoteric bit operations.

runtime/vm/intrinsifier_arm.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intrinsifier.h"
 
 #include "vm/assembler.h"
@@ skipping 1053 matching lines @@
 
 
 void Intrinsifier::Smi_bitNegate(Assembler* assembler) {
   __ ldr(R0, Address(SP, 0 * kWordSize));
   __ mvn(R0, ShifterOperand(R0));
   __ bic(R0, R0, ShifterOperand(kSmiTagMask));  // Remove inverted smi-tag.
   __ Ret();
 }
 
 
+void Intrinsifier::Smi_bitLength(Assembler* assembler) {

[srdjan, 2013/09/06 15:35:34]

Add a TODO?

+}

[Lasse Reichstein Nielsen, 2013/09/06 12:40:11]

// Intentionally left empty
?

+
+
 // Check if the last argument is a double, jump to label 'is_smi' if smi
 // (easy to convert to double), otherwise jump to label 'not_double_smi',
 // Returns the last argument in R0.
 static void TestLastArgumentIsDouble(Assembler* assembler,
                                      Label* is_smi,
                                      Label* not_double_smi) {
   __ ldr(R0, Address(SP, 0 * kWordSize));
   __ tst(R0, ShifterOperand(kSmiTagMask));
   __ b(is_smi, EQ);
   __ CompareClassId(R0, kDoubleCid, R1);
@@ skipping 562 matching lines @@
 
   __ Bind(&ok);
   __ Ret();
 
   __ Bind(&fall_through);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM