[llvm-commits] [llvm] r46727 - /llvm/trunk/include/llvm/IntrinsicsX86.td

[Dale Johannesen]

On Feb 5, 2008, at 2:19 PM, Chris Lattner wrote:

> On Feb 5, 2008, at 11:41 AM, Evan Cheng wrote:
>> With or without...
>
> Right, I agree.  The f.e. should do this unconditionally,
>
> -Chris

OK, maybe so.  The trouble is people use those builtins that are  
linked to a
particular instruction, and expect to get that instruction and nothing  
else.
But I don't have much sympathy for those people:)

>> On Feb 5, 2008, at 11:39 AM, Chris Lattner wrote:
>>> On Feb 5, 2008, at 11:37 AM, Evan Cheng wrote:
>>>
>>>>> That means you have to know whether you've got SSE4.1 in the FE.
>>>>> This is not an insuperable obstacle, but I think it's better to
>>>>> leave
>>>>> target
>>>>> dependencies in the BE when possible.
>>>>
>>>> Even with SSE4.1, it's a good idea to lower them to extract element
>>>> instructions. X86ISelLoweringhas all the information necessary to
>>>> determine what instructions to they should be selected to.
>>>
>>> Do you mean 'even without SSE4.1'?
>>>
>>> -Chris
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