[RFC][4.4] PR rtl-optimization/3507 appalling optimization with sub/cmp

[Joseph S. Myers]

On Wed, 28 Nov 2007, Rask Ingemann Lambertsen wrote:

>    I'll be submitting approximately the patch below when trunk reopens for
> stage1. At the moment I'm looking for comments. For example, I'm expecting
> someone to say a few words about floating point issues, but feel free to

I'm not clear what you want said about floating-point issues (something 
for a comment in the code about why it must be integer-only?), but for 
example inf == inf but inf - inf == NaN.

-- 
Joseph S. Myers
joseph@codesourcery.com