[PATCH v2] Remove isinf uses that rely on signed return value

[Joseph Myers]

On Thu, 20 Aug 2015, Wilco Dijkstra wrote:

> I found a few more cases where isinf is used to get the signbit. Clean 
> these up to improve the readability and maintainability and allow 
> inlining. Generated code is virtually identical once isinf is inlined 
> using the GCC builtin.
> 
> OK for commit?

What exactly are the dependencies of this patch and their review state?

My understanding is that first we need to get in benchmarks for the 
classification macros.  Then, given such benchmarks checked in, the change 
to use the built-in functions can be considered on the basis of evidence 
from those benchmarks.  Then, with the built-in functions in use, we can 
consider patches like this based on such comparisons of code generated.

-- 
Joseph S. Myers
joseph@codesourcery.com