[LLVMdev] c char translated to i8 signext

Ryan M. Lefever lefever at crhc.uiuc.edu
Wed Apr 30 11:22:24 PDT 2008

Thanks for your response.  When I attempt to get the parameter attribute 
lists for the function and its call sites, the list is NULL.  Is there 
someone else I should be looking to get the parameter attributes?

Chris Lattner wrote:
> On Wed, 30 Apr 2008, Ryan M. Lefever wrote:
>> I have a c function that takes a char as a parameter.  When it is
>> compiled to bytecode, it gets translated to i8 signext.  Why is signext
>> getting added to the type?  It doesn't get added if the parameter is an
>> int.  Is there a way to alter the parameter in the c code so that it
>> simply gets translated to an i8, or is there a way in LLVM to modify the
>> parameter's type?
> This is an ABI requirement for your target.  You can remove it from the 
> llvm ir by removing the parameter attribute from the function and calls to 
> it.
> -Chris

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