[cfe-dev] CGBuiltin.cpp?

[Eric Christopher]

(Sorry for the delay, slipped off of my email radar)

Sure, happy to take a look at them.

-eric

On Mon, Feb 9, 2015 at 3:36 PM reed kotler <rkotler at mips.com> wrote:

>  You want me to submit the patches for these changes?
>
> It would be nice to clean up this module.
>
> There are probably dejagnu tests worth porting to llvm test suite for this
> too.
>
> My manager gave me approval to work on it.
>
>
> On 02/08/2015 11:02 AM, Eric Christopher wrote:
>
>
>
> On Sun Feb 08 2015 at 9:57:05 AM Reid Kleckner <rnk at google.com> wrote:
>
>> The question isn't about the Intel _mm_* intrinsics, it's about the C
>> math builtins we provide under __builtin_pow, etc. I think most of them are
>> mapped to their libc calls for convenience. Some have been added on an
>> ad-hoc basis as needed.
>>
>>
>  Right. Same general principle :)
>
>
>>  I believe that GCC lowers most calls to __builtin_sqrt and such to
>> instructions before library calls, so we can go ahead and map most of those
>> down to LLVM intrinsics without worrying about things like errno. It's
>> worth checking as you go, though, rather than blindly mapping everything to
>> LLVM intrinsics.
>>
>>
>  Agreed.
>
>  -eric
>
>
>>  On Sat, Feb 7, 2015 at 9:29 PM, Eric Christopher <echristo at gmail.com>
>> wrote:
>>
>>> The idea is that the builtins are wrapped by portable intrinsics (e.g.
>>> _mm_* on x86) and therefore those should be used as an interface in
>>> programming. If there's no suitable intrinsic then we'll expose the builtin.
>>>
>>>  -eric
>>>
>>> On Fri Feb 06 2015 at 6:34:35 PM reed kotler <rkotler at mips.com> wrote:
>>>
>>>> Why is that many of the gcc builtins are not mapped to the llvm ir
>>>> builtins, in cases
>>>> where there is a corresponding llvm ir builtin/intrinsic.
>>>>
>>>> For example, sin, cos, log, log2, exp, exp2.....??
>>>>
>>>> Of the normal math functions is seems that just pow and fabs are there.
>>>>
>>>> Reed
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>>>>
>>>
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>>
>
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