Make SNaN verification universal for all arches.

src/objects-debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/heap/objects-visiting.h"
 #include "src/jsregexp.h"
@@ skipping 372 matching lines @@
     Object* e = get(i);
     VerifyPointer(e);
   }
 }
 
 
 void FixedDoubleArray::FixedDoubleArrayVerify() {
   for (int i = 0; i < length(); i++) {
     if (!is_the_hole(i)) {
       uint64_t value = get_representation(i);
-      CHECK((value & V8_UINT64_C(0x7FF8000000000000)) !=
-                V8_UINT64_C(0x7FF0000000000000) ||
+      uint64_t unexpected =
+          bit_cast<uint64_t>(std::numeric_limits<double>::quiet_NaN()) &
+          V8_UINT64_C(0x7FF8000000000000);
+      // Create implementation specific sNaN by inverting relevant bit.
+      unexpected ^= V8_UINT64_C(0x0008000000000000);
+      CHECK((value & V8_UINT64_C(0x7FF8000000000000)) != unexpected ||
             (value & V8_UINT64_C(0x0007FFFFFFFFFFFF)) == V8_UINT64_C(0));
     }
   }
 }
 
 
 void ConstantPoolArray::ConstantPoolArrayVerify() {
   CHECK(IsConstantPoolArray());
   ConstantPoolArray::Iterator code_iter(this, ConstantPoolArray::CODE_PTR);
   while (!code_iter.is_finished()) {
@@ skipping 869 matching lines @@
                          ? it.rinfo()->target_cell()
                          : it.rinfo()->target_object();
     CHECK(!CanLeak(target, heap, skip_weak_cell));
   }
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal