[LLVMdev] TSFlagsFields and TSFlagsShifts obsolete?

[Jakob Stoklund Olesen]

I think we can get rid of the TSFlagsFields and TSFlagsShifts hack in the InstrInfo TableGen class now.

This seems to work just fine:

class Instruction {
  bits<32> TSFlags;
}

class Domain<bits<2> val> {
  bits<2> Value = val;
}
def GenericDomain   : Domain<0>;
def SSEPackedInt    : Domain<1>;
def SSEPackedSingle : Domain<2>;
def SSEPackedDouble : Domain<3>;

class X86Instr<bits<8> opcod> : Instruction {
  Domain ExeDomain = GenericDomain;
  let TSFlags{0-7} = opcod;
  let TSFlags{22-23} = ExeDomain.Value;
}

class PIInstr<bits<8> opcod> : X86Instr<opcod> {
  let ExeDomain = SSEPackedInt;
}

def i1 : X86Instr<0x12>;
def i2 : PIInstr<0x34>;
def i3 : PIInstr<0x34> { let ExeDomain = SSEPackedSingle; }


Wouldn't it be better to assign TSFlags bits directly in an Instruction subclass, rather than in a magic InstrInfo instance somewhere?

/jakob


------------- Classes -----------------
class Domain<bits<2> Domain:val = { ?, ? }> {
  bits<2> Value = { Domain:val{1}, Domain:val{0} };
}
class Instruction {
  bits<32> TSFlags = { ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? };
}
class PIInstr<bits<8> PIInstr:opcod = { ?, ?, ?, ?, ?, ?, ?, ? }> {	// Instruction X86Instr
  bits<32> TSFlags = { ?, ?, ?, ?, ?, ?, ?, ?, ExeDomain.Value{0}, ExeDomain.Value{1}, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, PIInstr:opcod{0}, PIInstr:opcod{1}, PIInstr:opcod{2}, PIInstr:opcod{3}, PIInstr:opcod{4}, PIInstr:opcod{5}, PIInstr:opcod{6}, PIInstr:opcod{7} };
  Domain ExeDomain = SSEPackedInt;
}
class X86Instr<bits<8> X86Instr:opcod = { ?, ?, ?, ?, ?, ?, ?, ? }> {	// Instruction
  bits<32> TSFlags = { ?, ?, ?, ?, ?, ?, ?, ?, ExeDomain.Value{0}, ExeDomain.Value{1}, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, X86Instr:opcod{0}, X86Instr:opcod{1}, X86Instr:opcod{2}, X86Instr:opcod{3}, X86Instr:opcod{4}, X86Instr:opcod{5}, X86Instr:opcod{6}, X86Instr:opcod{7} };
  Domain ExeDomain = GenericDomain;
}
------------- Defs -----------------
def GenericDomain {	// Domain
  bits<2> Value = { 0, 0 };
}
def SSEPackedDouble {	// Domain
  bits<2> Value = { 1, 1 };
}
def SSEPackedInt {	// Domain
  bits<2> Value = { 0, 1 };
}
def SSEPackedSingle {	// Domain
  bits<2> Value = { 1, 0 };
}
def i1 {	// Instruction X86Instr
  bits<32> TSFlags = { ?, ?, ?, ?, ?, ?, ?, ?, 0, 0, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 0, 1, 0, 0, 1, 0, 0, 0 };
  Domain ExeDomain = GenericDomain;
}
def i2 {	// Instruction X86Instr PIInstr
  bits<32> TSFlags = { ?, ?, ?, ?, ?, ?, ?, ?, 1, 0, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 0, 0, 1, 0, 1, 1, 0, 0 };
  Domain ExeDomain = SSEPackedInt;
}
def i3 {	// Instruction X86Instr PIInstr
  bits<32> TSFlags = { ?, ?, ?, ?, ?, ?, ?, ?, 0, 1, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 0, 0, 1, 0, 1, 1, 0, 0 };
  Domain ExeDomain = SSEPackedSingle;
}