[Pandas-dev] Setuptools detection of host cpuinfo and/or header file availablity

[Stephen Lin]

The compiler won't use the intrinsics on its own, unfortunately, since
it doesn't know about the alignment and buffer size guarantees.

I will be fixing this in llvm/clang soon enough :)

Stephen

On Fri, Apr 26, 2013 at 7:46 PM, yoval p. <yoval at gmx.com> wrote:
> Conventional wisdom says that these days trying to outdo
> optimizing compilers is a fool's errand.
> Do you have numbers showing that manually coding at the instruction
> level can do significantly better then the compiler?
>
> If so, you're probably a modern day
> [John_Henry](https://en.wikipedia.org/wiki/John_Henry_(folklore)), In
> which case try not to drop dead at the end of a long and agonizing
> python packaging nightmare, as we'd like to see more of your tricks in
> pandas in the future.
>
> Yoval
>
> On 04/27/2013 02:14 AM, Stephen Lin wrote:
>>> icc can automatically bloat the binary with parallel paths and choose at
>>> runtime like you describe IIRC.
>>
>> Also, yeah, I've heard that it does that, but I don't trust a compiler
>> to do this optimally :D how could it know where to place the check
>> optimally? You don't want to do redundant checks within tight loops
>> but you also don't want to create too many parallel code paths;
>> there's also ABI/linking issues if it duplicates entire functions...
>>
>> Stephen
>>
>
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