[PATCH] CodeGen target hook for emitting intrinsic or libcall for pow*

[Eli Bendersky]

On Wed, Jul 10, 2013 at 11:26 AM, John McCall <rjmccall at apple.com> wrote:

> On Jul 10, 2013, at 11:18 AM, Eli Bendersky <eliben at google.com> wrote:
>
> On Wed, Jul 10, 2013 at 3:03 AM, John McCall <rjmccall at apple.com> wrote:
>
>> On Jun 27, 2013, at 3:57 PM, Eli Bendersky <eliben at google.com> wrote:
>> > Without fmath-errno, Clang currently generates calls to @llvm.pow.*
>> intrinsics when it sees pow*(). This may not be suitable for all targets
>> (for example PNaCl), so the attached patch adds a target hook that CodeGen
>> queries. The target can state its preference for having or not having the
>> intrinsic generated. Non-PNaCl behavior remains unchanged; PNaCl-specific
>> test added.
>>
>> Isn't a more straightforward and less invasive approach to just invoke
>> the compiler with -fno-builtin=pow or something along those lines?
>>
>
> We don't control the flags users supply to Clang though.
>
>
> Then handle it in the driver.
>

Would that not be more intrusive, then? Or perhaps I'm misunderstanding
what you're proposing.

Eli
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