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* [Bug libstdc++/84949] -ffast-math bugged with respect to NaNs [not found] <bug-84949-4@http.gcc.gnu.org/bugzilla/> @ 2020-09-18 7:09 ` kretz at kde dot org 2021-09-21 6:41 ` rguenth at gcc dot gnu.org 2023-10-10 13:58 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 3+ messages in thread From: kretz at kde dot org @ 2020-09-18 7:09 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84949 --- Comment #8 from Matthias Kretz (Vir) <kretz at kde dot org> --- I've been doing a lot of research into the numeric_limits intent/meaning recently. I also implemented and used alternative interpretations of "has NaN" and "is IEC559". My conclusion: std::numeric_limits means "has NaN bitpattern" and "has IEC559 bit layout" not "has NaNs with NaN behavior" and "has IEC559 behavior". The former are still useful even if the latter don't hold. The C++ standard could be clearer on this matter though. Thus, it seems the status quo is working as intended. It's just that we're missing a standard interface to ask for behavior conformance. Any progress on this issue must go via WG21. Besides: my patch in #6 was not accepted (ABI concerns: specifically ABI breakage from using different -f... flags), so should this PR be closed? ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug libstdc++/84949] -ffast-math bugged with respect to NaNs [not found] <bug-84949-4@http.gcc.gnu.org/bugzilla/> 2020-09-18 7:09 ` [Bug libstdc++/84949] -ffast-math bugged with respect to NaNs kretz at kde dot org @ 2021-09-21 6:41 ` rguenth at gcc dot gnu.org 2023-10-10 13:58 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 3+ messages in thread From: rguenth at gcc dot gnu.org @ 2021-09-21 6:41 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84949 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |SUSPENDED --- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> --- I think this is a good bug to dup to since it contains good information, so lets suspend it. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug libstdc++/84949] -ffast-math bugged with respect to NaNs [not found] <bug-84949-4@http.gcc.gnu.org/bugzilla/> 2020-09-18 7:09 ` [Bug libstdc++/84949] -ffast-math bugged with respect to NaNs kretz at kde dot org 2021-09-21 6:41 ` rguenth at gcc dot gnu.org @ 2023-10-10 13:58 ` pinskia at gcc dot gnu.org 2 siblings, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-10-10 13:58 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84949 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |Zahira.Ammarguellat at intel dot c | |om --- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> --- *** Bug 111759 has been marked as a duplicate of this bug. *** ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-10-10 13:58 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2020-09-18 7:09 ` [Bug libstdc++/84949] -ffast-math bugged with respect to NaNs kretz at kde dot org
2021-09-21 6:41 ` rguenth at gcc dot gnu.org
2023-10-10 13:58 ` pinskia at gcc dot gnu.org
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