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Villmow, Micah

2012-Apr-19 22:07 UTC

[LLVMdev] Tablegen to match a literal in an instruction

I am trying to make some modifications to our code generator that will produce
better code, but require adding new patterns.

What I am trying to do is take a register/register pattern and change it to a
register/immediate.
So for example, I have this pattern:
class ILFormat<ILOpCode op, dag outs, dag ins, string asmstr, list<dag>
pattern>
: Instruction {
     let Namespace = "AMDIL";
     dag OutOperandList = outs;
     dag InOperandList = ins;
     ILOpCode operation = op;
     let Pattern = pattern;
     let AsmString = !strconcat(asmstr, "\n");
     bit hasIEEEFlag = 0;
     bit hasZeroOpFlag = 0;
}
class BinaryOp<ILOpCode op, SDNode OpNode, RegisterClass dReg,
      RegisterClass sReg0, RegisterClass sReg1>
      : ILFormat<op, (outs dReg:$dst), (ins sReg0:$src0, sReg1:$src1),
      !strconcat(op.Text, " $dst, $src0, $src1"),
      [(set dReg:$dst, (OpNode sReg0:$src0, sReg1:$src1))]>;
multiclass BinaryOpMCInt<ILOpCode OpCode, SDNode OpNode> {
  def _i8    : BinaryOp<OpCode, OpNode, GPRI8, GPRI8, GPRI8>;

  def _i16    : BinaryOp<OpCode, OpNode, GPRI16, GPRI16, GPRI16>;
  def _i32    : BinaryOp<OpCode, OpNode, GPRI32, GPRI32, GPRI32>;
  def _i64    : BinaryOp<OpCode, OpNode, GPRI64, GPRI64, GPRI64>;
}
defm AND        : BinaryOpMCInt<IL_OP_AND, and>;

I want to turn this into a register/immediate pattern by changing it to:
class ILFormat<dag outs, dag ins, string asmstr, list<dag> pattern>
: Instruction {
     let Namespace = "AMDIL";
     dag OutOperandList = outs;
     dag InOperandList = ins;
     let Pattern = pattern;
     let AsmString = !strconcat(asmstr, "\n");
}
multiclass BinaryOp<SDNode OpNode, RegisterClass dReg,
      RegisterClass sReg0, RegisterClass sReg1, Operand lit>
{
def _rr: ILFormat<op, (outs dReg:$dst), (ins sReg0:$src0, sReg1:$src1),
      !strconcat(op.Text, " $dst, $src0, $src1"),
      [(set dReg:$dst, (OpNode sReg0:$src0, sReg1:$src1))]>;
def _ri : ILFormat<op, (outs dReg:$dst), (ins sReg0:$src0, lit:$src1),
      "and  $dst, $src0, $src1"),
      [(set dReg:$dst, (OpNode sReg0:$src0, imm:$src1))]>;

}
multiclass BinaryOpMCInt<SDNode OpNode> {
  defm _i32  : BinaryOp<OpNode, GPRI32, GPRI32, GPRI32, i32imm>;
}
defm AND        : BinaryOpMCInt<and>;


When I run on a simple program which just ands a value and writes to memory, I
get this error:
LLVM ERROR: Cannot select: 0x99555d0: i32 = Constant<2> [ORD=7] [ID=8]

Where 0x99555d0 is only used as the second operand of the 'and' node.

So, how can I figure out what I'm doing wrong? Does anyone see anything
majorly wrong here?

Thanks,
Micah
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Owen Anderson

2012-Apr-19 22:34 UTC

head link

[LLVMdev] Tablegen to match a literal in an instruction

Micah,

I don't see anything wrong with this offhand.  Have you tried getting the
debug output from llc -debug, and matching it up with the state machine in your
DAGISel.inc to see at what step the auto-generated matcher is failing to match
your and-with-immediate?

-Owen

On Apr 19, 2012, at 3:07 PM, "Villmow, Micah" <Micah.Villmow at
amd.com> wrote:
> I am trying to make some modifications to our code generator that will
produce better code, but require adding new patterns.
>  
> What I am trying to do is take a register/register pattern and change it to
a register/immediate.
> So for example, I have this pattern:
> class ILFormat<ILOpCode op, dag outs, dag ins, string asmstr,
list<dag> pattern>
> : Instruction {
>      let Namespace = "AMDIL";
>      dag OutOperandList = outs;
>      dag InOperandList = ins;
>      ILOpCode operation = op;
>      let Pattern = pattern;
>      let AsmString = !strconcat(asmstr, "\n");
>      bit hasIEEEFlag = 0;
>      bit hasZeroOpFlag = 0;
> }
> class BinaryOp<ILOpCode op, SDNode OpNode, RegisterClass dReg,
>       RegisterClass sReg0, RegisterClass sReg1>
>       : ILFormat<op, (outs dReg:$dst), (ins sReg0:$src0, sReg1:$src1),
>       !strconcat(op.Text, " $dst, $src0, $src1"),
>       [(set dReg:$dst, (OpNode sReg0:$src0, sReg1:$src1))]>;
> multiclass BinaryOpMCInt<ILOpCode OpCode, SDNode OpNode> {
>   def _i8    : BinaryOp<OpCode, OpNode, GPRI8, GPRI8, GPRI8>;
>  
>   def _i16    : BinaryOp<OpCode, OpNode, GPRI16, GPRI16, GPRI16>;
>   def _i32    : BinaryOp<OpCode, OpNode, GPRI32, GPRI32, GPRI32>;
>   def _i64    : BinaryOp<OpCode, OpNode, GPRI64, GPRI64, GPRI64>;
> }
> defm AND        : BinaryOpMCInt<IL_OP_AND, and>;
>  
> I want to turn this into a register/immediate pattern by changing it to:
> class ILFormat<dag outs, dag ins, string asmstr, list<dag>
pattern>
> : Instruction {
>      let Namespace = "AMDIL";
>      dag OutOperandList = outs;
>      dag InOperandList = ins;
>      let Pattern = pattern;
>      let AsmString = !strconcat(asmstr, "\n");
> }
> multiclass BinaryOp<SDNode OpNode, RegisterClass dReg,
>       RegisterClass sReg0, RegisterClass sReg1, Operand lit>
> {
> def _rr: ILFormat<op, (outs dReg:$dst), (ins sReg0:$src0, sReg1:$src1),
>       !strconcat(op.Text, " $dst, $src0, $src1"),
>       [(set dReg:$dst, (OpNode sReg0:$src0, sReg1:$src1))]>;
> def _ri : ILFormat<op, (outs dReg:$dst), (ins sReg0:$src0, lit:$src1),
>       "and  $dst, $src0, $src1"),
>       [(set dReg:$dst, (OpNode sReg0:$src0, imm:$src1))]>;
>  
> }
> multiclass BinaryOpMCInt<SDNode OpNode> {
>   defm _i32  : BinaryOp<OpNode, GPRI32, GPRI32, GPRI32, i32imm>;
> }
> defm AND        : BinaryOpMCInt<and>;
>  
>  
> When I run on a simple program which just ands a value and writes to
memory, I get this error:
> LLVM ERROR: Cannot select: 0x99555d0: i32 = Constant<2> [ORD=7]
[ID=8]
>  
> Where 0x99555d0 is only used as the second operand of the 'and'
node.
>  
> So, how can I figure out what I'm doing wrong? Does anyone see anything
majorly wrong here?
>  
> Thanks,
> Micah
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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Villmow, Micah

2012-Apr-19 23:05 UTC

head link

[LLVMdev] Tablegen to match a literal in an instruction

I'm not at the machine that has the changes, but it was failing at index 0.

Micah

From: Owen Anderson [mailto:resistor at mac.com]
Sent: Thursday, April 19, 2012 3:35 PM
To: Villmow, Micah
Cc: LLVM Developers Mailing List
Subject: Re: [LLVMdev] Tablegen to match a literal in an instruction

Micah,

I don't see anything wrong with this offhand.  Have you tried getting the
debug output from llc -debug, and matching it up with the state machine in your
DAGISel.inc to see at what step the auto-generated matcher is failing to match
your and-with-immediate?

-Owen

On Apr 19, 2012, at 3:07 PM, "Villmow, Micah" <Micah.Villmow at
amd.com<mailto:Micah.Villmow at amd.com>> wrote:


I am trying to make some modifications to our code generator that will produce
better code, but require adding new patterns.

What I am trying to do is take a register/register pattern and change it to a
register/immediate.
So for example, I have this pattern:
class ILFormat<ILOpCode op, dag outs, dag ins, string asmstr, list<dag>
pattern>
: Instruction {
     let Namespace = "AMDIL";
     dag OutOperandList = outs;
     dag InOperandList = ins;
     ILOpCode operation = op;
     let Pattern = pattern;
     let AsmString = !strconcat(asmstr, "\n");
     bit hasIEEEFlag = 0;
     bit hasZeroOpFlag = 0;
}
class BinaryOp<ILOpCode op, SDNode OpNode, RegisterClass dReg,
      RegisterClass sReg0, RegisterClass sReg1>
      : ILFormat<op, (outs dReg:$dst), (ins sReg0:$src0, sReg1:$src1),
      !strconcat(op.Text, " $dst, $src0, $src1"),
      [(set dReg:$dst, (OpNode sReg0:$src0, sReg1:$src1))]>;
multiclass BinaryOpMCInt<ILOpCode OpCode, SDNode OpNode> {
  def _i8    : BinaryOp<OpCode, OpNode, GPRI8, GPRI8, GPRI8>;

  def _i16    : BinaryOp<OpCode, OpNode, GPRI16, GPRI16, GPRI16>;
  def _i32    : BinaryOp<OpCode, OpNode, GPRI32, GPRI32, GPRI32>;
  def _i64    : BinaryOp<OpCode, OpNode, GPRI64, GPRI64, GPRI64>;
}
defm AND        : BinaryOpMCInt<IL_OP_AND, and>;

I want to turn this into a register/immediate pattern by changing it to:
class ILFormat<dag outs, dag ins, string asmstr, list<dag> pattern>
: Instruction {
     let Namespace = "AMDIL";
     dag OutOperandList = outs;
     dag InOperandList = ins;
     let Pattern = pattern;
     let AsmString = !strconcat(asmstr, "\n");
}
multiclass BinaryOp<SDNode OpNode, RegisterClass dReg,
      RegisterClass sReg0, RegisterClass sReg1, Operand lit>
{
def _rr: ILFormat<op, (outs dReg:$dst), (ins sReg0:$src0, sReg1:$src1),
      !strconcat(op.Text, " $dst, $src0, $src1"),
      [(set dReg:$dst, (OpNode sReg0:$src0, sReg1:$src1))]>;
def _ri : ILFormat<op, (outs dReg:$dst), (ins sReg0:$src0, lit:$src1),
      "and  $dst, $src0, $src1"),
      [(set dReg:$dst, (OpNode sReg0:$src0, imm:$src1))]>;

}
multiclass BinaryOpMCInt<SDNode OpNode> {
  defm _i32  : BinaryOp<OpNode, GPRI32, GPRI32, GPRI32, i32imm>;
}
defm AND        : BinaryOpMCInt<and>;


When I run on a simple program which just ands a value and writes to memory, I
get this error:
LLVM ERROR: Cannot select: 0x99555d0: i32 = Constant<2> [ORD=7] [ID=8]

Where 0x99555d0 is only used as the second operand of the 'and' node.

So, how can I figure out what I'm doing wrong? Does anyone see anything
majorly wrong here?

Thanks,
Micah
_______________________________________________
LLVM Developers mailing list
LLVMdev at cs.uiuc.edu<mailto:LLVMdev at cs.uiuc.edu>        
http://llvm.cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

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