[llvm-commits] updated nounwind for basic blocks patch

[Nick Lewycky]

Chris Lattner wrote:
> On Mar 16, 2008, at 11:11 AM, Nick Lewycky wrote:
> 
>> This patch adds nounwind to basic blocks.
>>
>> The major change from the previous patch is the removal of any  
>> attempt at tri-state behaviour between nounwind and unwinds to. We  
>> now permit basic blocks to be defined with both:
>>
>>  bb42: nounwind unwinds to %cleanup42
>>
>> the reason being that a block may be marked 'nounwind' by a pass  
>> that needs to preserve the CFG and therefore can't remove the  
>> 'unwinds to' edge.
> 
> There is no patch for LangRef.html, lets start there.

I'm actually waiting until the exact behaviour of 'unwinds to' is 
settled so we can update the LangRef in one atomic move.

It's clear what the syntax for it ought to be, but I don't want to add 
it to LangRef until it's clear what is and is not valid code.

Nick