Use signaling NaN for holes in fixed double arrays.

src/arm/simulator-arm.cc

Index: src/arm/simulator-arm.cc
diff --git a/src/arm/simulator-arm.cc b/src/arm/simulator-arm.cc
index e34c3116e6d0d41debcc4c6c8a8bb3e5dd3fa6cd..356fc672045a977f990b945e3403868b50831eb4 100644
--- a/src/arm/simulator-arm.cc
+++ b/src/arm/simulator-arm.cc
@@ -1917,8 +1917,13 @@ void Simulator::SoftwareInterrupt(Instruction* instr) {
 
 
 double Simulator::canonicalizeNaN(double value) {
-  return (FPSCR_default_NaN_mode_ && std::isnan(value)) ?
-    FixedDoubleArray::canonical_not_the_hole_nan_as_double() : value;
+  // Default NaN value, see "NaN handling" in "IEEE 754 standard implementation

[Benedikt Meurer, 2015/01/20 13:09:39]

This is a drive-by-fix: The canonical_not_the_hole_nan is not the Default NaN
mentioned by the ARM reference manual.

+  // choices" of the ARM Reference Manual.
+  const uint64_t kDefaultNaN = V8_UINT64_C(0x7FF8000000000000);
+  if (FPSCR_default_NaN_mode_ && std::isnan(value)) {
+    value = bit_cast<double>(kDefaultNaN);
+  }
+  return value;
 }