[llvm-commits] [llvm] r63090 - in /llvm/trunk: lib/Target/X86/X86InstrInfo.td test/CodeGen/X86/smul-with-overflow-2.ll

Bill Wendling wendling at apple.com
Mon Feb 2 13:31:42 PST 2009


On Feb 2, 2009, at 1:31 PM, Chris Lattner wrote:

> On Feb 2, 2009, at 1:24 PM, Eli Friedman wrote:
>
>> On Mon, Feb 2, 2009 at 2:07 AM, Török Edwin <edwintorok at gmail.com>  
>> wrote:
>>> What are the semantics of llvm.OP.with.overflow intrinsics that I  
>>> keep
>>> seeing lately?
>>
>> The first result is the same as a regular OP.  The second result is
>> whether there was an overflow while calculating the result; for
>> example, llvm.smul.with.overflow returns whether there was a signed
>> overflow in computing the product.
>>
>>> LangRef makes no mention of them.
>>
>> They're still a work in progress... I'm sure they'll get added  
>> eventually.
>
> actually, this is a pretty bad oversight.  Bill can you please add  
> these to LangRef?
>
Okay.

-bw



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