ARM: Fix comparison of NaN values....

src/arm/simulator-arm.cc

 // 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 2582 matching lines @@
   ASSERT((instr->Bit(4) == 0) && (instr->Opc1Field() == 0x7));
   ASSERT(((instr->Opc2Field() == 0x4) || (instr->Opc2Field() == 0x5)) &&
          (instr->Opc3Field() & 0x1));
   // Comparison.
 
   VFPRegPrecision precision = kSinglePrecision;
   if (instr->SzField() == 1) {
     precision = kDoublePrecision;
   }
 
-  if (instr->Bit(7) != 0) {
-    // Raising exceptions for quiet NaNs are not supported.
-    UNIMPLEMENTED();  // Not used by V8.
-  }
-
   int d = instr->VFPDRegCode(precision);
   int m = 0;
   if (instr->Opc2Field() == 0x4) {
     m = instr->VFPMRegCode(precision);
   }
 
   if (precision == kDoublePrecision) {
     double dd_value = get_double_from_d_register(d);
     double dm_value = 0.0;
     if (instr->Opc2Field() == 0x4) {
       dm_value = get_double_from_d_register(m);
     }
 
+    // Raise exceptions for quiet NaNs if necessary.
+    if (instr->Bit(7) == 1) {
+      if (isnan(dd_value)) {
+        inv_op_vfp_flag_ = true;
+      }
+    }
+
     Compute_FPSCR_Flags(dd_value, dm_value);
   } else {
     UNIMPLEMENTED();  // Not used by V8.
   }
 }
 
 
 void Simulator::DecodeVCVTBetweenDoubleAndSingle(Instr* instr) {
   ASSERT((instr->Bit(4) == 0) && (instr->Opc1Field() == 0x7));
   ASSERT((instr->Opc2Field() == 0x7) && (instr->Opc3Field() == 0x3));
@@ skipping 413 matching lines @@
   uintptr_t address = *stack_slot;
   set_register(sp, current_sp + sizeof(uintptr_t));
   return address;
 }
 
 } }  // namespace assembler::arm
 
 #endif  // USE_SIMULATOR
 
 #endif  // V8_TARGET_ARCH_ARM