Impelemnts some FPU arithmetic function for the MIPS simulator, assembler, disassembler.

runtime/vm/assembler_mips.h

Index: runtime/vm/assembler_mips.h
===================================================================
--- runtime/vm/assembler_mips.h	(revision 22804)
+++ runtime/vm/assembler_mips.h	(working copy)
@@ -454,10 +454,23 @@
     EmitFpuRType(COP1, FMT_L, F0, fs, fd, COP1_CVT_D);
   }
 
+  void cvtwd(FRegister fd, FRegister fs) {
+    ASSERT(EvenFPURegister(fs));
+    ASSERT(EvenFPURegister(fd));
+    EmitFpuRType(COP1, FMT_D, F0, fs, fd, COP1_CVT_W);
+  }
+
   void div(Register rs, Register rt) {
     EmitRType(SPECIAL, rs, rt, R0, 0, DIV);
   }
 
+  void divd(FRegister fd, FRegister fs, FRegister ft) {
+    ASSERT(EvenFPURegister(fd));
+    ASSERT(EvenFPURegister(fs));
+    ASSERT(EvenFPURegister(ft));
+    EmitFpuRType(COP1, FMT_D, ft, fs, fd, COP1_DIV);
+  }
+
   void divu(Register rs, Register rt) {
     EmitRType(SPECIAL, rs, rt, R0, 0, DIVU);
   }
@@ -554,6 +567,13 @@
          fs << kFsShift);
   }
 
+  void muld(FRegister fd, FRegister fs, FRegister ft) {
+    ASSERT(EvenFPURegister(fd));
+    ASSERT(EvenFPURegister(fs));
+    ASSERT(EvenFPURegister(ft));
+    EmitFpuRType(COP1, FMT_D, ft, fs, fd, COP1_MUL);
+  }
+
   void mult(Register rs, Register rt) {
     EmitRType(SPECIAL, rs, rt, R0, 0, MULT);
   }
@@ -609,6 +629,12 @@
     EmitRType(SPECIAL, rs, rt, rd, 0, SLTU);
   }
 
+  void sqrtd(FRegister fd, FRegister fs) {
+    ASSERT(EvenFPURegister(fd));
+    ASSERT(EvenFPURegister(fs));
+    EmitFpuRType(COP1, FMT_D, F0, fs, fd, COP1_SQRT);
+  }
+
   void sra(Register rd, Register rt, int sa) {
     EmitRType(SPECIAL, R0, rt, rd, sa, SRA);
   }
@@ -625,6 +651,13 @@
     EmitRType(SPECIAL, rs, rt, rd, 0, SRLV);
   }
 
+  void subd(FRegister fd, FRegister fs, FRegister ft) {
+    ASSERT(EvenFPURegister(fd));
+    ASSERT(EvenFPURegister(fs));
+    ASSERT(EvenFPURegister(ft));
+    EmitFpuRType(COP1, FMT_D, ft, fs, fd, COP1_SUB);
+  }
+
   void subu(Register rd, Register rs, Register rt) {
     EmitRType(SPECIAL, rs, rt, rd, 0, SUBU);
   }