MIPS: Implement sqrt in inline assembly.

src/mips/codegen-mips.cc

Index: src/mips/codegen-mips.cc
diff --git a/src/mips/codegen-mips.cc b/src/mips/codegen-mips.cc
index 7a207120a23d020c958855588ac084532d3b7bee..d07a6bbd21c0ef506fe1c9d5e1fbe6a729285aae 100644
--- a/src/mips/codegen-mips.cc
+++ b/src/mips/codegen-mips.cc
@@ -525,13 +525,33 @@ OS::MemCopyUint8Function CreateMemCopyUint8Function(
 }
 #endif
 
-#undef __
+UnaryMathFunction CreateSqrtFunction() {
+#if defined(USE_SIMULATOR)
+  return &std::sqrt;
+#else
+  size_t actual_size;
+  byte* buffer = static_cast<byte*>(OS::Allocate(1 * KB, &actual_size, true));
+  if (buffer == NULL) return &std::sqrt;
 
+  MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size));
 
-UnaryMathFunction CreateSqrtFunction() {
-  return &sqrt;
+  __ GetFromCDoubleArguments(f12);
+  __ sqrt_d(f0, f12);
+  __ SetForCDoubleResult(f0);
+  __ Ret();
+
+  CodeDesc desc;
+  masm.GetCode(&desc);
+  ASSERT(!RelocInfo::RequiresRelocation(desc));
+
+  CPU::FlushICache(buffer, actual_size);
+  OS::ProtectCode(buffer, actual_size);
+  return FUNCTION_CAST<UnaryMathFunction>(buffer);
+#endif
 }
 
+#undef __
+
 
 // -------------------------------------------------------------------------
 // Platform-specific RuntimeCallHelper functions.