Implements DoubleToI on ARM. Refactor some VFP code at the same time and...

src/arm/constants-arm.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 362 matching lines @@
 
 
 // Type of VFP register. Determines register encoding.
 enum VFPRegPrecision {
   kSinglePrecision = 0,
   kDoublePrecision = 1
 };
 
 
 // VFP FPSCR constants.
+enum VFPConversionMode {
+  kFPSCRRounding = 0,
+  kDefaultRoundToZero = 1
+};
+
 static const uint32_t kVFPExceptionMask = 0xf;
-static const uint32_t kVFPRoundingModeMask = 3 << 22;
 static const uint32_t kVFPFlushToZeroMask = 1 << 24;
-static const uint32_t kVFPRoundToMinusInfinityBits = 2 << 22;
 static const uint32_t kVFPInvalidExceptionBit = 1;
 
 static const uint32_t kVFPNConditionFlagBit = 1 << 31;
 static const uint32_t kVFPZConditionFlagBit = 1 << 30;
 static const uint32_t kVFPCConditionFlagBit = 1 << 29;
 static const uint32_t kVFPVConditionFlagBit = 1 << 28;
 
 
 // VFP rounding modes. See ARM DDI 0406B Page A2-29.
-enum FPSCRRoundingModes {
-  RN,   // Round to Nearest.
-  RP,   // Round towards Plus Infinity.
-  RM,   // Round towards Minus Infinity.
-  RZ    // Round towards zero.
+enum VFPRoundingMode {
+  RN = 0 << 22,   // Round to Nearest.
+  RP = 1 << 22,   // Round towards Plus Infinity.
+  RM = 2 << 22,   // Round towards Minus Infinity.
+  RZ = 3 << 22,   // Round towards zero.
+
+  // Aliases.
+  kRoundToNearest = RN,
+  kRoundToPlusInf = RP,
+  kRoundToMinusInf = RM,
+  kRoundToZero = RZ
 };
 
+static const uint32_t kVFPRoundingModeMask = 3 << 22;
 
 // -----------------------------------------------------------------------------
 // Hints.
 
 // Branch hints are not used on the ARM.  They are defined so that they can
 // appear in shared function signatures, but will be ignored in ARM
 // implementations.
 enum Hint { no_hint };
 
 // Hints are not used on the arm.  Negating is trivial.
@@ skipping 327 matching lines @@
   static int Number(const char* name, bool* is_double);
 
  private:
   static const char* names_[kNumVFPRegisters];
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_CONSTANTS_ARM_H_