Message 292243 - Python tracker

Message292243

Author	vstinner
Recipients	benjamin.peterson, dim, eric.smith, mark.dickinson, serhiy.storchaka, vstinner
Date	2017-04-24.22:55:44
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1493074544.6.0.219377083246.issue30124@psf.upfronthosting.co.za>
In-reply-to

Content
> As an experiment, and to show what would be needed (at minimum), I have attempted to make Python/dtoa.c completely aliasing-safe here: > https://github.com/DimitryAndric/cpython/commit/29c3f6f5cd771fce5630f127b9e7054593e3160c Would it be technically possible to completely get ride of the union? For example, it would allow to replace: set_dval(rv, get_dval(rv) + sulp(rv, bc)); with: rv += sulp(rv, bc); Is it possible to replace Big0 and Big1 with Big double? etc.

Content

> As an experiment, and to show what would be needed (at minimum), I have attempted to make Python/dtoa.c completely aliasing-safe here:
> https://github.com/DimitryAndric/cpython/commit/29c3f6f5cd771fce5630f127b9e7054593e3160c

Would it be technically possible to completely get ride of the union? For example, it would allow to replace:

   set_dval(rv, get_dval(rv) + sulp(rv, bc));
with:
   rv += sulp(rv, bc);

Is it possible to replace Big0 and Big1 with Big double?

etc.

History
Date	User	Action	Args
2017-04-24 22:55:44	vstinner	set	recipients: + vstinner, mark.dickinson, eric.smith, benjamin.peterson, serhiy.storchaka, dim
2017-04-24 22:55:44	vstinner	set	messageid: <1493074544.6.0.219377083246.issue30124@psf.upfronthosting.co.za>
2017-04-24 22:55:44	vstinner	link	issue30124 messages
2017-04-24 22:55:44	vstinner	create