Implement Smi_bitLength intrinsic on mips, arm, and arm64.

runtime/vm/disassembler_arm64.cc

 // Copyright (c) 2014, 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/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 #include "platform/assert.h"
 
@@ skipping 1018 matching lines @@
     case 7:
       Format(instr, "bic'sfs 'rd, 'rn, 'shift_op");
       break;
     default:
       UNREACHABLE();
       break;
   }
 }
 
 
+void ARM64Decoder::DecodeMiscDP1Source(Instr* instr) {
+  if (instr->Bit(29) != 0) {
+    Unknown(instr);
+  }
+
+  const int op = instr->Bits(10, 10);
+  switch (op) {
+    case 4:
+      Format(instr, "clz'sf 'rd, 'rn");
+      break;
+    default:
+      Unknown(instr);
+      break;
+  }
+}
+
+
 void ARM64Decoder::DecodeMiscDP2Source(Instr* instr) {
   if (instr->Bit(29) != 0) {
     Unknown(instr);
   }
 
   const int op = instr->Bits(10, 5);
   switch (op) {
     case 2:
       Format(instr, "udiv'sf 'rd, 'rn, 'rm");
       break;
@@ skipping 55 matching lines @@
 }
 
 
 void ARM64Decoder::DecodeDPRegister(Instr* instr) {
   if (instr->IsAddSubShiftExtOp()) {
     DecodeAddSubShiftExt(instr);
   } else if (instr->IsAddSubWithCarryOp()) {
     DecodeAddSubWithCarry(instr);
   } else if (instr->IsLogicalShiftOp()) {
     DecodeLogicalShift(instr);
+  } else if (instr->IsMiscDP1SourceOp()) {
+    DecodeMiscDP1Source(instr);
   } else if (instr->IsMiscDP2SourceOp()) {
     DecodeMiscDP2Source(instr);
   } else if (instr->IsMiscDP3SourceOp()) {
     DecodeMiscDP3Source(instr);
   } else if (instr->IsConditionalSelectOp()) {
     DecodeConditionalSelect(instr);
   } else {
     Unknown(instr);
   }
 }
@@ skipping 318 matching lines @@
   int32_t instruction_bits = Instr::At(pc)->InstructionBits();
   OS::SNPrint(hex_buffer, hex_size, "%08x", instruction_bits);
   if (out_instr_size) {
     *out_instr_size = Instr::kInstrSize;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM