23 Nov
2018
23 Nov
'18
6:09 a.m.
Am 23.11.18 um 03:56 schrieb Hermann Meyer:
Am 22.11.18 um 23:44 schrieb Robin Gareus:
As a side note, in my side project GxPlugins.lv2 I still use -ffast-math
without problems.
On 11/22/2018 09:27 PM, Hermann Meyer wrote:
that happen during write, not during read. During read, nan's and
inf's will be replaced by standard values when detected, but it mean's
that original settings been lost.
The values been saved as 0.5 with a dot, the comma is used as
separator between the entry's.
(and no error with entry separation ever happen)
It could happen as well to values which may ain't been used/changed
during a session.
And it happen in a non-reproducible way. Very strange, and indeed only
when -ffinite-math-only
is turned on.
I've tried for weeks to find out what really happen, but could only
nail it to -ffinite-math-only.
-ffast-math, on the other hand changes the resulting sound, it's
minimal, but, notable.
The only flag from the -ffast-math macro we still use is -fno-math-errno.
regards
hermann
However, problems with NAN's and INF's when use -ffinite-math-only
occurs only when we save preset values to file, and only sometimes
then.
A shot in the dark..
Serializing a float in most parts of the world uses comma as decimal
separator. e.g. "0,5"
Reading this in the C-locale (dot as decimal separator) with c/c++
standard library functions returns 0. This may lead to a division by
zero later.
Cheers!
robin