[cfe-dev] GCC extensions not implemented yet

[Mark Schimmel]

Fixed point arithmetic is basically integer arithmetic that saturates instead of wrapping zero.  I want to add saturating integer operations to the IR.  I could implement these by adding intrinsic functions rather than real opcodes, but I would really like to have vectorization support someday.

Note, the operations are defined by the technical report in section 4.1.6.

I have read http://clang.llvm.org/get_involved.html and will commit to it.  I do not know if there is "Evidence of a significant user community".  It is supported by gcc and ACE, but I have no insight beyond that.

-----Original Message-----
From: Hal Finkel [mailto:hfinkel at anl.gov] 
Sent: Tuesday, October 15, 2013 7:06 PM
To: Mark Schimmel
Cc: cfe-dev at cs.uiuc.edu
Subject: Re: [cfe-dev] GCC extensions not implemented yet

Mark,

Can you explain more about what you have in mind. I suppose that the semantic analysis portions are pretty well defined, but what would this mean in terms of code generation?

 -Hal

----- Original Message -----
> 
> 
> 
> 
> http://clang.llvm.org/docs/UsersManual.html says “ clang does not 
> support decimal floating point types ( _Decimal32 and friends) or 
> fixed-point types ( _Fract and friends); nobody has expressed interest 
> in these features yet, so it’s hard to say when they will be 
> implemented ”.
> 
> 
> 
> Synopsys is interested in the fixed point data types and is starting 
> to add extensions for it. Is this an extension the community would 
> want in the clang/llvm tree?
> 
> 
> 
> See section 4:
> http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1275.pdf