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

[Eli Bendersky]

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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