Add signMask getter to Float32x4

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 1400 matching lines @@
     get_modrm(*current, &mod, &regop, &rm);
     AppendToBuffer("movups ");
     current += PrintRightXMMOperand(current);
     AppendToBuffer(", %s", NameOfXMMRegister(regop));
   } else if (opcode == 0x10) {
     // movups xmm, xmm/m128
     int mod, regop, rm;
     get_modrm(*current, &mod, &regop, &rm);
     AppendToBuffer("movups %s, ", NameOfXMMRegister(regop));
     current += PrintRightXMMOperand(current);
+  } else if (opcode == 0x50) {
+    int mod, regop, rm;
+    get_modrm(*current, &mod, &regop, &rm);
+    AppendToBuffer("movmskps %s,", NameOfCPURegister(regop));
+    current += PrintRightXMMOperand(current);
   } else if (opcode == 0xA2 || opcode == 0x31) {
     // RDTSC or CPUID
     AppendToBuffer("%s", mnemonic);
 
   } else if ((opcode & 0xF0) == 0x40) {
     // CMOVcc: conditional move.
     int condition = opcode & 0x0F;
     const InstructionDesc& idesc = cmov_instructions[condition];
     byte_size_operand_ = idesc.byte_size_operation;
     current += PrintOperands(idesc.mnem, idesc.op_order_, current);
@@ skipping 497 matching lines @@
                                   pc);
     pc += instruction_length;
   }
 
   return;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64