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

[Quentin Colombet]

Hi Eli,

Just a thought, wouldn’t be better to add a hook in TargetSelectionDAGInfo for pow, just like memset and memmove?
Indeed, I guess that pow intrinsics may have special handling in some optimizations and I am afraid we lose those benefits with the proposed patch.

What do you think?

Cheers,

-Quentin

On Jun 27, 2013, at 3:57 PM, Eli Bendersky <eliben at google.com> wrote:

> Hello,
> 
> 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.
> 
> Please take a look,
> 
> Eli
> 
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