[llvm-commits] Fixing Bug 13662: paired register for inline asm with 64-bit data on ARM

[Weiming Zhao]

Hi Andrew,

 

Could you please review the patch? 

This patch adds a special handling case for CopyFromReg of Untyped in
ScheduleDAGRRList.cpp::GetCostForDef().

 

Thanks,

Weiming

 

Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by
The Linux Foundation

 

From: Weiming Zhao [mailto:weimingz at codeaurora.org] 
Sent: Friday, January 25, 2013 3:50 PM
To: 'Jakob Stoklund Olesen'
Cc: 'llvm-commits at cs.uiuc.edu'
Subject: RE: [llvm-commits] Fixing Bug 13662: paired register for inline asm
with 64-bit data on ARM

 

Hi Jakob,

 

Attached is the patch for fixing CopyFromReg in scheduler.

With this change, I’m able to implement GPRPair in inlineAsm without
touching any other target independent part.

 

Please help to review it.

 

Thanks,

Weiming

 

 

Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by
The Linux Foundation

 

From: Jakob Stoklund Olesen [mailto:stoklund at 2pi.dk] 
Sent: Friday, January 25, 2013 9:22 AM
To: weimingz at codeaurora.org
Cc: llvm-commits at cs.uiuc.edu
Subject: Re: [llvm-commits] Fixing Bug 13662: paired register for inline asm
with 64-bit data on ARM

 

 

On Jan 24, 2013, at 5:46 PM, "Weiming Zhao" <weimingz at codeaurora.org> wrote:

 

Hi Jakob,

 

First, I’m really sorry for late repose. I was really busy on other parts of
LLVM in the past few weeks.

 

CopyFromReg can’t take a Untyped VT because
ScheduleDAGRRList.cpp::GetCostForDef() expects MachineOpCode for Untyped
node, while CopyFromReg is not a MachineOpCode:

 

static void GetCostForDef(
) {

  MVT VT = RegDefPos.GetValue();

 

  // Special handling for untyped values.  These values can only come from

  // the expansion of custom DAG-to-DAG patterns.

  if (VT == MVT::Untyped) {

    const SDNode *Node = RegDefPos.GetNode();

    unsigned Opcode = Node->getMachineOpcode(); à CopyFromReg is not a
MachineOpcode()

 

This is why I’m avoiding using CopyFromReg for Untyped.

 

I think it is fine to add support for untyped CopyFromReg nodes there. You
can get the register class from the virtual source register, and otherwise
handle it the same way REG_SEQUENCE is handled.

 

Please make that change in a separate patch.

 

/jakob

 

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