https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116331
Bug ID: 116331
Summary: Math function non-determinism due to excessive
precision and constant folding
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116331
--- Comment #3 from Carl Dehlin ---
Thanks Andrew for your quick response and confirmation of what is going on.
After reading through all the excessive precision stuff I was so sure this
related to it! Very interesting to see that floating poin
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116331
--- Comment #4 from Carl Dehlin ---
Found answer or 3) here:
https://sourceware.org/glibc/manual/latest/html_mono/libc.html#Known-Maximum-Errors-in-Math-Functions
.
For x86_64 cos is accurate up to 1 ulp from the correctly rounded value. As I
un
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116331
--- Comment #6 from Carl Dehlin ---
Thanks Jakub for your explanation.
Indeed, the following program runs fine and confirms what you just said.
Inspecting the assembly shows can both std::cos and __builtin_cos are
substituted to a library call w
