[LLVMdev] Doubts about lowering of UMUL_LOHI

[Sachin.Punyani at microchip.com]

> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]
On
> Behalf Of Eli Friedman
> Sent: Thursday, December 18, 2008 1:52 PM
> To: LLVM Developers Mailing List
> Subject: Re: [LLVMdev] Doubts about lowering of UMUL_LOHI
> 
> On Wed, Dec 17, 2008 at 11:49 PM,  <Sachin.Punyani at microchip.com>
wrote:
> > 2)       Why is custom legalization of this node not allowed?
> 
> No target has needed it so far.  Why do you need it?

I may not need this.

I have an 8-bit target. Also there is no instruction for multiply
operation. Therefore I want to make a library call for this operation. I
think better option would be to have library calls for types MVT::i8 and
MVT::i16 in RTLIB enum. 

Currently this enum does not list any calls for types less than
MVT::i32.

Regards
Sachin

> 
> > 3)       My target does not have any instruction directly matching
to
> this
> > operation. How should this node be legalized?
> 
> If your target doesn't have this operation, you should mark it Expand;
> legalization will take care of the rest.
> 
> -Eli
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