Implements FPU compare and branching for MIPS simulator, assembler, disassembler.

runtime/vm/simulator_mips.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Declares a Simulator for MIPS instructions if we are not generating a native
 // MIPS binary. This Simulator allows us to run and debug MIPS code generation
 // on regular desktop machines.
 // Dart calls into generated code by "calling" the InvokeDartCode stub,
 // which will start execution in the Simulator or forwards to the real entry
 // on a MIPS HW platform.
@@ skipping 43 matching lines @@
   // Accessor for the pc.
   void set_pc(int32_t value) { pc_ = value; }
   int32_t get_pc() const { return pc_; }
 
   // Accessors for hi, lo registers.
   void set_hi_register(int32_t value) { hi_reg_ = value; }
   void set_lo_register(int32_t value) { lo_reg_ = value; }
   int32_t get_hi_register() const { return hi_reg_; }
   int32_t get_lo_register() const { return lo_reg_; }
 
+  int32_t get_fcsr_condition_bit(int32_t cc) const {
+    if (cc == 0) {
+      return 23;
+    } else {
+      return 24 + cc;
+    }
+  }
+
+  void set_fcsr_bit(uint32_t cc, bool value) {
+    if (value) {
+      fcsr_ |= (1 << cc);
+    } else {
+      fcsr_ &= ~(1 << cc);
+    }
+  }
+
+  bool test_fcsr_bit(uint32_t cc) {
+    return fcsr_ & (1 << cc);
+  }
+
   // Accessor to the internal simulator stack top.
   uword StackTop() const;
 
   // The isolate's top_exit_frame_info refers to a Dart frame in the simulator
   // stack. The simulator's top_exit_frame_info refers to a C++ frame in the
   // native stack.
   uword top_exit_frame_info() const { return top_exit_frame_info_; }
   void set_top_exit_frame_info(uword value) { top_exit_frame_info_ = value; }
 
   // Call on program start.
@@ skipping 28 matching lines @@
   // simulated execution, so that the simulator can "return" to the native
   // C code.
   static const uword kEndSimulatingPC = -1;
 
   // Special registers for the results of div, divu.
   int32_t hi_reg_;
   int32_t lo_reg_;
 
   int32_t registers_[kNumberOfCpuRegisters];
   int32_t fregisters_[kNumberOfFRegisters];
+  int32_t fcsr_;
   uword pc_;
 
   // Simulator support.
   char* stack_;
   int icount_;
   bool delay_slot_;
   SimulatorSetjmpBuffer* last_setjmp_buffer_;
   uword top_exit_frame_info_;
 
   // Registered breakpoints.
@@ skipping 55 matching lines @@
   }
 
   friend class SimulatorDebugger;
   friend class SimulatorSetjmpBuffer;
   DISALLOW_COPY_AND_ASSIGN(Simulator);
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_MIPS_H_