[turbofan] Change TruncateFloat32ToUint64 to TryTruncateFloat32ToUint64.

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

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index c86f4f22eef5babbd2fa271389bf2e20330ff41e..bb2902e2fb816c690a0bb3517a90969f6f5fe047 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -1068,6 +1068,19 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       }
       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()) {
@@ -1078,8 +1091,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       // Check if the result of the Float32ToInt64 conversion is positive, we
       // are already done.
       __ testq(i.OutputRegister(), i.OutputRegister());
-      Label done;
-      __ j(positive, &done);
+      __ 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.
@@ -1099,10 +1111,27 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       // earlier.
       __ Set(kScratchRegister, 0x8000000000000000);
       __ orq(i.OutputRegister(), kScratchRegister);
+      __ bind(&success);
+      if (instr->OutputCount() > 1) {
+        __ 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()) {
@@ -1110,14 +1139,9 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       } 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;
-      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