Adds more SIMD instructions for ARM.

runtime/vm/constants_arm.h

 // 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.
 
 #ifndef VM_CONSTANTS_ARM_H_
 #define VM_CONSTANTS_ARM_H_
 
 #include "platform/assert.h"
 
 namespace dart {
 
 // We support both VFPv3-D16 and VFPv3-D32 profiles, but currently only one at
 // a time.
 // TODO(zra): Detect number of registers at runtime by querying /proc/cpuinfo.
-#define VFPv3_D32
+#define VFPv3_D16

[regis, 2013/07/22 22:47:11]

After you figure out the issue on the hardware, you can remove the todo and the
define, and always use 32 registers.

 #if defined(VFPv3_D16) == defined(VFPv3_D32)
 #error "Exactly one of VFPv3_D16 or VFPv3_D32 can be defined at a time."
 #endif
 
 
 enum Register {
   kFirstFreeCpuRegister = 0,
   R0  =  0,
   R1  =  1,
   R2  =  2,
@@ skipping 132 matching lines @@
 
 static inline DRegister EvenDRegisterOf(QRegister q) {
   return static_cast<DRegister>(q * 2);
 }
 
 static inline DRegister OddDRegisterOf(QRegister q) {
   return static_cast<DRegister>((q * 2) + 1);
 }
 
 
 static inline SRegister EvenSRegisterOf(DRegister d) {

[regis, 2013/07/22 22:47:11]

Assert that d is in range. It could be out of range, i.e. >= 16, for VFPv3_D32.

[zra, 2013/07/22 23:20:09]

I've added an assert under VFPv3_D32. 

   return static_cast<SRegister>(d * 2);
 }
 
 static inline SRegister OddSRegisterOf(DRegister d) {

[regis, 2013/07/22 22:47:11]

ditto

[zra, 2013/07/22 23:20:09]

Same.

   return static_cast<SRegister>((d * 2) + 1);
 }
 
 
 // Register aliases for floating point scratch registers.
 const QRegister QTMP = Q7;  // Overlaps with DTMP, STMP.
 const DRegister DTMP = EvenDRegisterOf(QTMP);  // Overlaps with STMP.
 const SRegister STMP = EvenSRegisterOf(DTMP);
 
 // Architecture independent aliases.
@@ skipping 467 matching lines @@
   static Instr* At(uword pc) { return reinterpret_cast<Instr*>(pc); }
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
 };
 
 }  // namespace dart
 
 #endif  // VM_CONSTANTS_ARM_H_