X64 Crankshaft: Implement DoubleToI in optimizing compiler.

src/x64/lithium-codegen-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2851 matching lines @@
   ASSERT(result->IsDoubleRegister());
 
   Register input_reg = ToRegister(input);
   XMMRegister result_reg = ToDoubleRegister(result);
 
   EmitNumberUntagD(input_reg, result_reg, instr->environment());
 }
 
 
 void LCodeGen::DoDoubleToI(LDoubleToI* instr) {
-  Abort("Unimplemented: %s", "DoDoubleToI");
+  LOperand* input = instr->InputAt(0);
+  ASSERT(input->IsDoubleRegister());
+  LOperand* result = instr->result();
+  ASSERT(result->IsRegister());
+
+  XMMRegister input_reg = ToDoubleRegister(input);
+  Register result_reg = ToRegister(result);
+
+  if (instr->truncating()) {
+    // Performs a truncating conversion of a floating point number as used by
+    // the JS bitwise operations.
+    __ cvttsd2siq(result_reg, input_reg);
+    __ movq(kScratchRegister, V8_INT64_C(0x8000000000000000), RelocInfo::NONE); 
+    __ cmpl(result_reg, kScratchRegister);
+      DeoptimizeIf(equal, instr->environment());
+  } else {
+    __ cvttsd2si(result_reg, input_reg);
+    __ cvtlsi2sd(xmm0, result_reg);
+    __ ucomisd(xmm0, input_reg);
+    DeoptimizeIf(not_equal, instr->environment());
+    DeoptimizeIf(parity_even, instr->environment());  // NaN.
+    if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
+      NearLabel done;
+      // The integer converted back is equal to the original. We
+      // only have to test if we got -0 as an input.
+      __ testl(result_reg, result_reg);
+      __ j(not_zero, &done);
+      __ movmskpd(result_reg, input_reg);
+      // Bit 0 contains the sign of the double in input_reg.
+      // If input was positive, we are ok and return 0, otherwise
+      // deoptimize.
+      __ andl(result_reg, Immediate(1));
+      DeoptimizeIf(not_zero, instr->environment());
+      __ bind(&done);
+    }
+  }
 }
 
 
 void LCodeGen::DoCheckSmi(LCheckSmi* instr) {
   LOperand* input = instr->InputAt(0);
   ASSERT(input->IsRegister());
   Condition cc = masm()->CheckSmi(ToRegister(input));
   if (instr->condition() != equal) {
     cc = NegateCondition(cc);
   }
@@ skipping 384 matching lines @@
   RegisterEnvironmentForDeoptimization(environment);
   ASSERT(osr_pc_offset_ == -1);
   osr_pc_offset_ = masm()->pc_offset();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64