[turbofan] Change TruncateFloat64ToUint64 to TryTruncateFloatToUint64.

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 1086 matching lines @@
       break;
     }
     case kSSEFloat64ToUint64: {
       // 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));
       }
+      if (instr->OutputCount() > 1) {
+        __ Set(i.OutputRegister(1), 0);
+      }
       // Check if the result of the Float64ToInt64 conversion is positive, we
       // are already done.
       __ testq(i.OutputRegister(), i.OutputRegister());
       Label done;
-      __ j(positive, &done);
+      Label success;
+      __ j(positive, &success);
       // The result of the first conversion was negative, which means that the
       // input value was not within the positive int64 range. We subtract 2^64
       // and convert it again to see if it is within the uint64 range.
       __ Move(kScratchDoubleReg, -9223372036854775808.0);
       if (instr->InputAt(0)->IsDoubleRegister()) {
         __ addsd(kScratchDoubleReg, i.InputDoubleRegister(0));
       } else {
         __ addsd(kScratchDoubleReg, i.InputOperand(0));
       }
       __ Cvttsd2siq(i.OutputRegister(), kScratchDoubleReg);
       __ testq(i.OutputRegister(), i.OutputRegister());
       // The only possible negative value here is 0x80000000000000000, which is
       // used on x64 to indicate an integer overflow.
       __ j(negative, &done);
       // The input value is within uint64 range and the second conversion worked
       // successfully, but we still have to undo the subtraction we did
       // earlier.
-      __ movq(kScratchRegister, Immediate(1));
-      __ shlq(kScratchRegister, Immediate(63));
+      __ Set(kScratchRegister, 0x8000000000000000);
       __ orq(i.OutputRegister(), kScratchRegister);
+      __ bind(&success);
+      if (instr->OutputCount() > 1) {
+        __ Set(i.OutputRegister(1), 1);
+      }
       __ bind(&done);
       break;
     }
     case kSSEInt32ToFloat64:
       if (instr->InputAt(0)->IsRegister()) {
         __ Cvtlsi2sd(i.OutputDoubleRegister(), i.InputRegister(0));
       } else {
         __ Cvtlsi2sd(i.OutputDoubleRegister(), i.InputOperand(0));
       }
       break;
@@ skipping 908 matching lines @@
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8