PPC: [crankshaft] Address the deoptimization loops of Math.floor, Math.round and Math.ceil.

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

Index: src/crankshaft/ppc/lithium-codegen-ppc.cc
diff --git a/src/crankshaft/ppc/lithium-codegen-ppc.cc b/src/crankshaft/ppc/lithium-codegen-ppc.cc
index edc0d696b02d2b8de142f8e05a53ef947ed3a7a8..d3ba2a91730348e50dad6958e625b41e0febb8ba 100644
--- a/src/crankshaft/ppc/lithium-codegen-ppc.cc
+++ b/src/crankshaft/ppc/lithium-codegen-ppc.cc
@@ -3613,8 +3613,13 @@ void LCodeGen::DoMathAbs(LMathAbs* instr) {
   }
 }
 
+void LCodeGen::DoMathFloorD(LMathFloorD* instr) {
+  DoubleRegister input_reg = ToDoubleRegister(instr->value());
+  DoubleRegister output_reg = ToDoubleRegister(instr->result());
+  __ frim(output_reg, input_reg);
+}
 
-void LCodeGen::DoMathFloor(LMathFloor* instr) {
+void LCodeGen::DoMathFloorI(LMathFloorI* instr) {
   DoubleRegister input = ToDoubleRegister(instr->value());
   Register result = ToRegister(instr->result());
   Register input_high = scratch0();
@@ -3636,8 +3641,30 @@ void LCodeGen::DoMathFloor(LMathFloor* instr) {
   __ bind(&done);
 }
 
+void LCodeGen::DoMathRoundD(LMathRoundD* instr) {
+  DoubleRegister input_reg = ToDoubleRegister(instr->value());
+  DoubleRegister output_reg = ToDoubleRegister(instr->result());
+  DoubleRegister dot_five = double_scratch0();
+  Label done;
+
+  __ frin(output_reg, input_reg);
+  __ fcmpu(input_reg, kDoubleRegZero);
+  __ bge(&done);
+  __ fcmpu(output_reg, input_reg);
+  __ beq(&done);
+
+  // Negative, non-integer case
+  __ LoadDoubleLiteral(dot_five, 0.5, r0);
+  __ fadd(output_reg, input_reg, dot_five);
+  __ frim(output_reg, output_reg);
+  // The range [-0.5, -0.0[ yielded +0.0. Force the sign to negative.
+  __ fabs(output_reg, output_reg);
+  __ fneg(output_reg, output_reg);
+
+  __ bind(&done);
+}
 
-void LCodeGen::DoMathRound(LMathRound* instr) {
+void LCodeGen::DoMathRoundI(LMathRoundI* instr) {
   DoubleRegister input = ToDoubleRegister(instr->value());
   Register result = ToRegister(instr->result());
   DoubleRegister double_scratch1 = ToDoubleRegister(instr->temp());