Implement bitLength intrinsic on x64.

runtime/vm/disassembler_x64.cc

 // Copyright (c) 2012, 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_IA32.
 #if defined(TARGET_ARCH_X64)
 #include "platform/utils.h"
 #include "vm/allocation.h"
@@ skipping 1504 matching lines @@
 
   } else if (opcode == 0xBE || opcode == 0xBF || opcode == 0xB6 ||
              opcode == 0xB7 || opcode == 0xAF) {
     // Size-extending moves, IMUL.
     current += PrintOperands(mnemonic, REG_OPER_OP_ORDER, current);
 
   } else if ((opcode & 0xF0) == 0x90) {
     // SETcc: Set byte on condition. Needs pointer to beginning of instruction.
     current = data + SetCC(data);
 
-  } else if ((opcode & 0xFE) == 0xA4 || (opcode & 0xFE) == 0xAC ||
-             opcode == 0xAB || opcode == 0xA3) {
+  } else if (((opcode & 0xFE) == 0xA4) || ((opcode & 0xFE) == 0xAC) ||
+             (opcode == 0xAB) || (opcode == 0xA3) || (opcode == 0xBD)) {
     // SHLD, SHRD (double-prec. shift), BTS (bit test and set), BT (bit test).
     AppendToBuffer("%s%c ", mnemonic, operand_size_code());
     int mod, regop, rm;
     get_modrm(*current, &mod, &regop, &rm);
     current += PrintRightOperand(current);
     AppendToBuffer(",%s", NameOfCPURegister(regop));
-    if (opcode == 0xAB || opcode == 0xA3) {
+    if ((opcode == 0xAB) || (opcode == 0xA3) || (opcode == 0xBD)) {
       // Done.
-    } else if (opcode == 0xA5 || opcode == 0xAD) {
+    } else if ((opcode == 0xA5) || (opcode == 0xAD)) {
       AppendToBuffer(",cl");
     } else {
       AppendToBuffer(",");
       current += PrintImmediate(current, BYTE_SIZE);
     }
   } else {
     UnimplementedInstruction();
   }
   return static_cast<int>(current - data);
 }
@@ skipping 33 matching lines @@
     case 0xAD:
       return "shrd";
     case 0xAF:
       return "imul";
     case 0xB6:
       return "movzxb";
     case 0xB7:
       return "movzxw";
     case 0xBE:
       return "movsxb";
+    case 0xBD:
+      return "bsr";
     case 0xBF:
       return "movsxw";
     case 0x12:
       return "movhlps";
     case 0x16:
       return "movlhps";
     default:
       return NULL;
   }
 }
@@ skipping 344 matching lines @@
   }
   hex_buffer[hex_index] = '\0';
   if (out_instr_len) {
     *out_instr_len = instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64