MIPS: Fixed FPU rounding checks and related errors in the Simulator.

src/mips/stub-cache-mips.cc

Index: src/mips/stub-cache-mips.cc
diff --git a/src/mips/stub-cache-mips.cc b/src/mips/stub-cache-mips.cc
index fa2dd47b03d669e97580f7561357cae4f25bcef2..a9272eab7f26280a126c070b91b482f1d4c54f63 100644
--- a/src/mips/stub-cache-mips.cc
+++ b/src/mips/stub-cache-mips.cc
@@ -2096,9 +2096,7 @@ MaybeObject* CallStubCompiler::CompileMathFloorCall(Object* object,
 
   // Retrieve FCSR and check for fpu errors.
   __ cfc1(t5, FCSR);
-  __ srl(t5, t5, kFCSRFlagShift);
-  // Flag 1 marks an inaccurate but still good result so we ignore it.
-  __ And(t5, t5, Operand(kFCSRFlagMask ^ 1));
+  __ And(t5, t5, Operand(kFCSRExceptionFlagMask));
   __ Branch(&no_fpu_error, eq, t5, Operand(zero_reg));
 
   // Check for NaN, Infinity, and -Infinity.