llvm dev - Mar 2005 - [LLVMdev] SparcV9 branches

Hi,

I need to generate a branch instruction from within
CodeGenIntrinsic in SparcV9BurgISel.cpp.  I generate a few
instructions and add them to the mvec vector, and then I need
to generate a branch whose target is the first instruction in
the vector.

I've seen how other portions of the code do this, but they
have access to more information than CodeGenIntrinsic.

Thanks,

Brent

On Mon, Feb 28, 2005 at 09:39:49PM -0600, Brent Monroe
wrote:
> I need to generate a branch instruction from within CodeGenIntrinsic
> in SparcV9BurgISel.cpp.  I generate a few instructions and add them to
> the mvec vector, and then I need to generate a branch whose target is
> the first instruction in the vector.
> 
> I've seen how other portions of the code do this, but they have access
> to more information than CodeGenIntrinsic.
The long-term solution would be to restructure the V9 backend to
generate code like X86 and PPC backends do -- using MachineBasicBlocks
instead of std::vector<MachineInst*> .  

However, that is an involved project, so as a short-term workaround, you
may need to change the signature of CodeGenIntrinsic to pass in the
parameters that you need (adding MashineBasicBlock and/or an
iterator...?).  I don't see another way, but maybe someone else does?

If I am correct in this, I recommend you try to make your changes
minimal with respect to the current V9 codebase and make sure you don't
introduce any regressions, and then submit a patch.

-- 
Misha Brukman :: http://misha.brukman.net :: http://llvm.cs.uiuc.edu

On Mon, 28 Feb 2005, Brent Monroe wrote:
> I need to generate a branch instruction from within
> CodeGenIntrinsic in SparcV9BurgISel.cpp.  I generate a few
> instructions and add them to the mvec vector, and then I need
> to generate a branch whose target is the first instruction in
> the vector.
>
> I've seen how other portions of the code do this, but they
> have access to more information than CodeGenIntrinsic.
I don't think there is any way to do this in the V9 backend, but maybe 
Vikram knows a way.

-Chris

-- 
http://nondot.org/sabre/
http://llvm.cs.uiuc.edu/