Use xorps xmm1, xmm1 to creat a 0.0 cconstant. Add to utils a bitwise double test.

runtime/platform/utils.h

Index: runtime/platform/utils.h
===================================================================
--- runtime/platform/utils.h	(revision 35714)
+++ runtime/platform/utils.h	(working copy)
@@ -179,6 +179,12 @@
   static uint16_t HostToLittleEndian16(uint16_t host_value);
   static uint32_t HostToLittleEndian32(uint32_t host_value);
   static uint64_t HostToLittleEndian64(uint64_t host_value);
+
+  static bool DoublesBitEqual(const double a, const double b) {
+    const int64_t* a_i = reinterpret_cast<const int64_t*>(&a);

[zra, 2014/05/02 23:19:08]

bit_cast<int64_t, double>(a) is what we've been using in the simulators in this
situation, i.e.:

const int64_t a_i = bit_cast<int64_t, double>(a);
const int64_t b_i = bit_cast<int64_t, double>(b);
return (a_i == b_i);

But I guess it probably expands to the same thing.

[srdjan, 2014/05/02 23:33:47]

Done.

+    const int64_t* b_i = reinterpret_cast<const int64_t*>(&b);
+    return (*a_i == *b_i);
+  }
 };
 
 }  // namespace dart