Second version of TryTruncateFloat32ToUint64WithCheck that is working, this code goes into src/compiler/sparc64/code-generator-sparc64.cc

TryTruncateFloat32ToUint64WithCheck_v02.cpp

case kSparcCvtSXu: {
  Label done;
  Label success;
  Label simple;
  if (instr->OutputCount() > 1) {
	__ or3(G0, G0, i.OutputRegister(1));
  }
  // NaN
  __ fcmps(i.InputSingleRegister(0), i.InputSingleRegister(0));
  __ fb(f_unordered, true, &done);
  // if input < 2^63 do simple cvt_s_x
  // load 2 ^ 63 into kScratchSingleRegister
  __ or3(G0, 0x5f, kScratchRegister);
  __ sllx(kScratchRegister, 24, kScratchRegister);
  __ mov_w_s(kScratchRegister,  kScratchSingleRegister);
  __ fcmps(i.InputSingleRegister(0), kScratchSingleRegister);
  __ fb(f_less, true, &simple);

  DoubleRegister scratch0 = kScratchDoubleRegister;
  DoubleRegister scratch1 = kScratchDoubleRegister1;
  // DoubleRegister scratch1 = i.TempDoubleRegister(0);
  // subtract 2^63 from input
  // load -2^63 into scratch0 and add with input
  __ or3(G0, 0x61f, kScratchRegister);
  __ sllx(kScratchRegister, 53, kScratchRegister);
  __ mov_x_d(kScratchRegister, scratch0);
  // load input into scratch1
  __ cvt_s_d(i.InputSingleRegister(0), scratch1);
  // scratch0 contains input - 2 ^ 63
  __ add_d(scratch0, scratch1, scratch0);
  // load 2^63 into scratch1
  // __ cvt_s_d(kScratchSingleRegister, scratch1);
  __ or3(G0, 0x21f, kScratchRegister);
  __ sllx(kScratchRegister, 53, kScratchRegister);
  __ mov_x_d(kScratchRegister, scratch1);
  __ fcmpd(scratch0, scratch1);
  __ fb(f_greaterOrEqual, true, &done);
  __ cvt_d_x(scratch0, scratch0);
  __ mov_d_x(scratch0, i.OutputRegister());

  // still negative
  __ subcc(i.OutputRegister(), G0, G0);
  __ br(negative, &done);
  // undo subtraction
  __ or3(G0, 1, kScratchRegister);
  __ sllx(kScratchRegister, 63, kScratchRegister);
  __ or3(kScratchRegister, i.OutputRegister(), i.OutputRegister());
  __ ba(&success);

  // simple conversion
  __ bind(&simple);
  __ cvt_s_x(i.InputSingleRegister(0), kScratchDoubleRegister);
  __ mov_d_x(kScratchDoubleRegister, i.OutputRegister());
  __ orcc(i.OutputRegister(), i.OutputRegister(), G0);
  __ br(negative, &done);
  __ bind(&success);
  if (instr->OutputCount() > 1) {
	__ or3(G0, 1, i.OutputRegister(1));
  }
  __ bind(&done);
  break;
}
case kSparcCvtDW: