[LLVMdev] New to LLVM, Help needed

[Alireza.Moshtaghi at microchip.com]

More information on this... still not working

When I build the project for Debug and run the program, the following
message is printed before assert.

NODE: 0x937bac8:  i64 = GlobalAddress <i32* @var> 0

I guess it is expecting that GlobalAddress be legalized before reaching
ExpandOp(). I haven't implemented anything for ISD::GlobalAddress, and
that may explain it, however, I couldn't find much about it in the
PowerPC implementation either. The only thing is in the ctor of
PPCTargetLowering there is setOperationAction(ISD::GlobalAddress,
MVT::i32, Custom);  and 

setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);

 

so I also added these two function calls to my ctor of
PICxxTargetLowering. Nothing changed. I also tried "Expand" and "Legal"
instead of "Custom", still no progress. I'm sure I am missing some thing
here.

 

Any idea??

 

Thanks

A.

________________________________

From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]
On Behalf Of Evan Cheng
Sent: Monday, September 10, 2007 10:29 AM
To: LLVM Developers Mailing List
Subject: Re: [LLVMdev] New to LLVM, Help needed

 

Please do a debug build and run it under gdb. Let us know where it is
asserting and what it is asserting on so we can help you.

 

Evan

 

On Sep 7, 2007, at 4:50 PM, Alireza.Moshtaghi at microchip.com wrote:





Hi,

I have started to write an llvm backend for one of our microcontrollers
(PICxx). I started studying the framework of PowerPc backend of llvm and
decided to start by following that framework. Now I have most of the
classes and Tblgen files written for a very basic hypothetical
microcontroller with very few instructions.

The project builds and the llc recognizes the new processor, however,
when it reaches the point where it wants to lower llvm IR to PICxx DAG,
it asserts in LegalizeDAG.cpp in ExpandOp() function after it hits the
default case of switch(Node->getOpcode())

Can someone please help me understand how am I ending up in the default
case?

 

Thanks,

A.

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