llvm dev - Sep 2008 - [LLVMdev] Type Legalizer Question.

All the sub methods called inside ExpandIntegerOperand like
ExpandInOp_STORE etc have access to the expanded operands map.

Why they aren't passed to target LowerOperation? A target may also want
to use the already expanded Lo and Hi parts.

 

 

 

- Sanjiv

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On Tue, Sep 30, 2008 at 9:48 AM,  <Sanjiv.Gupta at microchip.com>
wrote:
> All the sub methods called inside ExpandIntegerOperand like
ExpandInOp_STORE
> etc have access to the expanded operands map.
>
> Why they aren't passed to target LowerOperation? A target may also want
to
> use the already expanded Lo and Hi parts.
You don't really need access to the map; just use build an
EXTRACT_ELEMENT node, and legalize will take care of the mapping for
you.

-Eli

> 
> On Tue, Sep 30, 2008 at 9:48 AM,  <Sanjiv.Gupta at microchip.com>
wrote:
> > All the sub methods called inside ExpandIntegerOperand like
> ExpandInOp_STORE
> > etc have access to the expanded operands map.
> >
> > Why they aren't passed to target LowerOperation? A target may also
want
> to
> > use the already expanded Lo and Hi parts.
> 
> You don't really need access to the map; just use build an
> EXTRACT_ELEMENT node, and legalize will take care of the mapping for
> you.
> 
> -Eli
>
Thanks. 
I have another query related to type legalizer.
Can a target ignore certain nodes during legalize? Probably a hook for
target that can be called inside IgnoreNodeResults ()?

We want to keep certain nodes illegal, especially the pointer nodes. 
Our target has 16-bit pointer and a few 16-bit insns to perform
arithmetic. 
Rest of the stuff is 8-bit so we want to use legalizer to expand them.

- Sanjiv
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