[PATCH] Fix pow simplification when fabs and sqrt are unavailable

[Kuperstein, Michael M]

Whoops, previous patch is bad.
Attached is a hopefully saner one.

(Also adds a missing check for pow(2.0, x) -> exp2(x) *correctly*, that's unrelated to the ldexp issue.)

From: Kuperstein, Michael M
Sent: Thursday, August 15, 2013 16:10
To: llvm-commits at cs.uiuc.edu
Subject: [PATCH] Fix pow simplification when fabs and sqrt are unavailable

Hi,

This adds a missing TLI check for the pow(x, 0.5) -> fabs(sqrt(x)) simplification.

There's a similar problem with exp2, but I don't see a LibFunc::ldexp I can check for.
Anyone has any idea if it's missing on purpose, or just an omission?

Michael
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