MIPS: Improve Float(32|64)(Max|Min).

src/crankshaft/mips/lithium-codegen-mips.cc

Index: src/crankshaft/mips/lithium-codegen-mips.cc
diff --git a/src/crankshaft/mips/lithium-codegen-mips.cc b/src/crankshaft/mips/lithium-codegen-mips.cc
index 8be7d297d469ef0d2c875048c1e0b1f0abb91b29..dfd605bb5f241457d8517db0f114ad168a04e4f2 100644
--- a/src/crankshaft/mips/lithium-codegen-mips.cc
+++ b/src/crankshaft/mips/lithium-codegen-mips.cc
@@ -1764,18 +1764,18 @@ void LCodeGen::DoMathMinMax(LMathMinMax* instr) {
     FPURegister left_reg = ToDoubleRegister(left);
     FPURegister right_reg = ToDoubleRegister(right);
     FPURegister result_reg = ToDoubleRegister(instr->result());
+
     Label nan, done;
     if (operation == HMathMinMax::kMathMax) {
-      __ MaxNaNCheck_d(result_reg, left_reg, right_reg, &nan);
+      __ Float64Max(result_reg, left_reg, right_reg, &nan);
     } else {
       DCHECK(operation == HMathMinMax::kMathMin);
-      __ MinNaNCheck_d(result_reg, left_reg, right_reg, &nan);
+      __ Float64Min(result_reg, left_reg, right_reg, &nan);
     }
     __ Branch(&done);
 
     __ bind(&nan);
-    __ LoadRoot(scratch, Heap::kNanValueRootIndex);
-    __ ldc1(result_reg, FieldMemOperand(scratch, HeapNumber::kValueOffset));
+    __ add_d(result_reg, left_reg, right_reg);
 
     __ bind(&done);
   }