[turbofan] Implemented the TruncateFloat32ToUint64 TurboFan operator.

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 af8f8e8aa7b167c56371cee42c79469823ed0a5d..85cc9b4bd44c67e51564345bfe3c31e5bedb44e6 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -1057,6 +1057,42 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
         __ Cvttsd2siq(i.OutputRegister(), i.InputOperand(0));
       }
       break;
+    case kSSEFloat32ToUint64: {
+      // 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.
+      __ testq(i.OutputRegister(), i.OutputRegister());
+      Label done;
+      __ j(positive, &done);
+      // 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, -9223372036854775808.0f);
+      if (instr->InputAt(0)->IsDoubleRegister()) {
+        __ addss(kScratchDoubleReg, i.InputDoubleRegister(0));
+      } else {
+        __ addss(kScratchDoubleReg, i.InputOperand(0));
+      }
+      __ Cvttss2siq(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));
+      __ orq(i.OutputRegister(), kScratchRegister);
+      __ bind(&done);
+      break;
+    }
     case kSSEFloat64ToUint64: {
       // There does not exist a Float64ToUint64 instruction, so we have to use
       // the Float64ToInt64 instruction.