Fix arm compilation. DiyFp multiplications are now in a separate procedure.

src/diy_fp.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 46 matching lines @@
   // The exponents of both numbers must be the same and this must be bigger
   // than other. The result will not be normalized.
   static DiyFp Minus(const DiyFp& a, const DiyFp& b) {
     DiyFp result = a;
     result.Subtract(b);
     return result;
   }
 
 
   // this = this * other.
-  void Multiply(const DiyFp& other) {
-    // Simply "emulates" a 128 bit multiplication.
-    // However: the resulting number only contains 64 bits. The least
-    // significant 64 bits are only used for rounding the most significant 64
-    // bits.
-    const uint64_t kM32 = 0xFFFFFFFFu;
-    uint64_t a = f_ >> 32;
-    uint64_t b = f_ & kM32;
-    uint64_t c = other.f_ >> 32;
-    uint64_t d = other.f_ & kM32;
-    uint64_t ac = a * c;
-    uint64_t bc = b * c;
-    uint64_t ad = a * d;
-    uint64_t bd = b * d;
-    uint64_t tmp = (bd >> 32) + (ad & kM32) + (bc & kM32);
-    tmp += 1U << 31;  // round
-    uint64_t result_f = ac + (ad >> 32) + (bc >> 32) + (tmp >> 32);
-    e_ += other.e_ + 64;
-    f_ = result_f;
-  }
+  void Multiply(const DiyFp& other);
 
   // returns a * b;
   static DiyFp Times(const DiyFp& a, const DiyFp& b) {
     DiyFp result = a;
     result.Multiply(b);
     return result;
   }
 
   void Normalize() {
     ASSERT(f_ != 0);
@@ skipping 30 matching lines @@
  private:
   static const uint64_t kUint64MSB = V8_2PART_UINT64_C(0x80000000, 00000000);
 
   uint64_t f_;
   int e_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_DIY_FP_H_