[llvm] r236031 - transform fadd chains to increase parallelism

[Owen Anderson]

> On Apr 29, 2015, at 8:32 PM, Sanjay Patel <spatel at rotateright.com> wrote:
> 
> I'm not seeing how in-order vs. OOO is a factor?

The transformation increases register pressure in order to expose ILP.  On an in-order machine, that is a purely negative tradeoff, since there’s no advantage to exposing ILP.

—Owen
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