shding at mtu.edu
2005-Jul-11 01:33 UTC
[LLVMdev] how to pass message from LLVM IR to bachend code
Hi: I want to pass some message of instructions from LLVM Internal representation to backend code. For example, I make a flag for some certain operands of certain instructions. How can it be passed to the backend instructions? Which programs I should look into? Would someone give me some idea? Thank you ! -- Shuhan
Chris Lattner
2005-Jul-11 01:47 UTC
[LLVMdev] how to pass message from LLVM IR to bachend code
On Sun, 10 Jul 2005 shding at mtu.edu wrote:> Hi: > I want to pass some message of instructions from LLVM Internal > representation to backend code. For example, I make a flag for some > certain operands of certain instructions. How can it be passed to the > backend instructions? Which programs I should look into? Would someone > give me some idea? Thank you !The easiest way to do this is to extend the LLVM IR itself. As a simple example of this, you can take a look at how the PHINode class has an extra 'reservedspace' member (ignore what it is used for though), or the load/store instructions track the 'isVolatile' flag. -Chris -- http://nondot.org/sabre/ http://llvm.cs.uiuc.edu/
shding at mtu.edu
2005-Jul-11 15:16 UTC
[LLVMdev] how to pass message from LLVM IR to bachend code
Hi: I have extended the IR for adding flag. But I just want this flag to pass through the backend machine code. I know there're several passes like register relocation, schedualing, etc. But I think I just miss the part which is used to "parser" the LLVM IR to machine code instructions. Would you give me some help? Thank you !> On Sun, 10 Jul 2005 shding at mtu.edu wrote: >> Hi: >> I want to pass some message of instructions from LLVM Internal >> representation to backend code. For example, I make a flag for some >> certain operands of certain instructions. How can it be passed to the >> backend instructions? Which programs I should look into? Would someone >> give me some idea? Thank you ! > > The easiest way to do this is to extend the LLVM IR itself. As a simple > example of this, you can take a look at how the PHINode class has an extra > 'reservedspace' member (ignore what it is used for though), or the > load/store instructions track the 'isVolatile' flag. > > -Chris > > -- > http://nondot.org/sabre/ > http://llvm.cs.uiuc.edu/ > > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev >-- Shuhan
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