[LLVMdev] Tablegen binary literals

[Pete Cooper]

On Jul 31, 2014, at 11:27 AM, Sean Silva <chisophugis at gmail.com> wrote:

> 
> 
> 
> On Thu, Jul 31, 2014 at 12:31 AM, Tim Northover <t.p.northover at gmail.com> wrote:
> > Yeah, exactly those 2 things.  I have them in separate patches, but I think
> > we only get the benefit from sized binary literals if we also allow them to
> > initialize multiple bits in another bits<n> type.
> 
> It also allows type checking for single initializers. I've been caught
> out a couple of times when I thought I'd given 17 digits in "let
> Inst{16-0} = 0b1001000111011010" or similar.
> 
> Allowing underscores in the literal seems like it would help alleviate this somewhat (do we already allow that?). That is what VHDL does ("Underlines can be used to increase readability and have no impact on the value."). 
Yeah, _’s sounds like a good idea.  I was going to do that independently of all this other work if there’s no objections.

Pete
> 
> -- Sean Silva
>  
> 
> Cheers.
> 
> Tim.
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