[turbofan] Fixed the second return value of TryTruncateFloatXXToUint64.

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 1091 matching lines @@
         __ bind(&fail);
         __ Set(i.OutputRegister(1), 0);
         __ bind(&done);
       }
       break;
     case kSSEFloat32ToUint64: {
       Label done;
       Label success;
       if (instr->OutputCount() > 1) {
         __ Set(i.OutputRegister(1), 0);
-        __ xorps(kScratchDoubleReg, kScratchDoubleReg);
-
-        if (instr->InputAt(0)->IsDoubleRegister()) {
-          __ Ucomiss(kScratchDoubleReg, i.InputDoubleRegister(0));
-        } else {
-          __ Ucomiss(kScratchDoubleReg, i.InputOperand(0));
-        }
-        __ j(above, &done);
       }
       // There does not exist a Float32ToUint64 instruction, so we have to use
       // the Float32ToInt64 instruction.
       if (instr->InputAt(0)->IsDoubleRegister()) {
         __ Cvttss2siq(i.OutputRegister(), i.InputDoubleRegister(0));
       } else {
         __ Cvttss2siq(i.OutputRegister(), i.InputOperand(0));
       }
       // Check if the result of the Float32ToInt64 conversion is positive, we
       // are already done.
@@ skipping 23 matching lines @@
         __ Set(i.OutputRegister(1), 1);
       }
       __ bind(&done);
       break;
     }
     case kSSEFloat64ToUint64: {
       Label done;
       Label success;
       if (instr->OutputCount() > 1) {
         __ Set(i.OutputRegister(1), 0);
-        __ xorps(kScratchDoubleReg, kScratchDoubleReg);
-
-        if (instr->InputAt(0)->IsDoubleRegister()) {
-          __ Ucomisd(kScratchDoubleReg, i.InputDoubleRegister(0));
-        } else {
-          __ Ucomisd(kScratchDoubleReg, i.InputOperand(0));
-        }
-        __ j(above, &done);
       }
       // There does not exist a Float64ToUint64 instruction, so we have to use
       // the Float64ToInt64 instruction.
       if (instr->InputAt(0)->IsDoubleRegister()) {
         __ Cvttsd2siq(i.OutputRegister(), i.InputDoubleRegister(0));
       } else {
         __ Cvttsd2siq(i.OutputRegister(), i.InputOperand(0));
       }
       // Check if the result of the Float64ToInt64 conversion is positive, we
       // are already done.
@@ skipping 943 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8