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

Eli Bendersky eliben at google.com
Wed Jul 10 11:18:52 PDT 2013

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.

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