MIPS: Inlining Math.min and Math.max in crankshaft.

Port r10391 (7900f3c).

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9195009
Patch from Daniel Kalmar <kalmard@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10436 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/lithium-codegen-mips.cc

@@ -3816,6 +3816,7 @@ void LCodeGen::DoSmiUntag(LSmiUntag* instr) {
 void LCodeGen::EmitNumberUntagD(Register input_reg,
                                 DoubleRegister result_reg,
                                 bool deoptimize_on_undefined,
+                                bool deoptimize_on_minus_zero,
                                 LEnvironment* env) {
   Register scratch = scratch0();
 
@@ -3845,6 +3846,12 @@ void LCodeGen::EmitNumberUntagD(Register input_reg,
   }
   // Heap number to double register conversion.
   __ ldc1(result_reg, FieldMemOperand(input_reg, HeapNumber::kValueOffset));
+  if (deoptimize_on_minus_zero) {
+    __ mfc1(at, result_reg.low());
+    __ Branch(&done, ne, at, Operand(zero_reg));
+    __ mfc1(scratch, result_reg.high());
+    DeoptimizeIf(eq, env, scratch, Operand(HeapNumber::kSignMask));
+  }
   __ Branch(&done);
 
   // Smi to double register conversion
@@ -3976,6 +3983,7 @@ void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
 
   EmitNumberUntagD(input_reg, result_reg,
                    instr->hydrogen()->deoptimize_on_undefined(),
+                   instr->hydrogen()->deoptimize_on_minus_zero(),
                    instr->environment());
 }
 

src/mips/lithium-codegen-mips.h

@@ -280,6 +280,7 @@ class LCodeGen BASE_EMBEDDED {
   void EmitNumberUntagD(Register input,
                         DoubleRegister result,
                         bool deoptimize_on_undefined,
+                        bool deoptimize_on_minus_zero,
                         LEnvironment* env);
 
   // Emits optimized code for typeof x == "y".  Modifies input register.