llvm dev - Apr 2010 - [LLVMdev] Target Constants

In SelectionDAG, what's the difference between getConstant and
getTargetConstant?  One creates a node with opcode Constant and the
other with TargetConstant.  What's the semantic difference?

In X86ISelLowering I need to create a constant vector and put
it in memory so I can reference it as an operand.  I don't see
any examples of doing this.  Is it possible?  If so, what's the
magic?

Thanks!

                         -Dave

I added some comments here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20100426/100541.html

To put a constant in memory, you should use a constant pool entry, and the
constant pool infrastructure.

Dan

On Apr 29, 2010, at 8:23 AM, David Greene wrote:
> In SelectionDAG, what's the difference between getConstant and
> getTargetConstant?  One creates a node with opcode Constant and the
> other with TargetConstant.  What's the semantic difference?
> 
> In X86ISelLowering I need to create a constant vector and put
> it in memory so I can reference it as an operand.  I don't see
> any examples of doing this.  Is it possible?  If so, what's the
> magic?
> 
> Thanks!
> 
>                         -Dave
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

On Thursday 29 April 2010 12:01:19 Dan Gohman wrote:
> I added some comments here:
> http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20100426/100541
>.html
>
> To put a constant in memory, you should use a constant pool entry, and the
> constant pool infrastructure.
Yeah, I figured that was the case.  Oh, I just found an example in x86
lowering.  Great!

Thanks for the extra commentary on TargetConstant.

                           -Dave