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Re: [RFC][4.4] PR rtl-optimization/3507 appalling optimization with sub/cmp
On Wed, 28 Nov 2007, Joseph S. Myers wrote:
> 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.
Correction: inf == inf is true, while inf - inf has the value NaN (not 0)
but "inf - inf == NaN" is false because NaN != NaN.
Joseph S. Myers