https://bugs.kde.org/show_bug.cgi?id=197915
p...@bezitopo.org changed:
What |Removed |Added
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CC| |p...@bezitopo.org
--- Comment #34 from p...@bezitopo.org ---
I just ran into this while debugging Bezitopo. I wrote the isTooCurly method
and found that it takes about 100 times as long when compiled by gcc as when
compiled by clang. So I ran it in Valgrind (callgrind) to see what's different.
It produced bizarre output. I debugged the code in Valgrind and found that the
line
precision=nextafterl(bigpart,2*bigpart)-bigpart;
in spiral.cpp produced 0 when bigpart is about 1e80. Dumping the variables
internal to the cornu function showed numbers like 3.33236731613775325228e+4605
(garbage), but it appears unable to compute a number bigger than about 5e307.
Versions:
valgrind-3.15.0
Linux puma 5.3.0-7625-generic #27~1576774560~19.10~f432cd8-Ubuntu SMP Thu Dec
19 20:35:37 UTC x86_64 x86_64 x86_64 GNU/Linux
gcc (Ubuntu 9.2.1-9ubuntu2) 9.2.1 20191008
clang version 9.0.0-2 (tags/RELEASE_900/final)
Eoan Ermine.
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