# Fastmath error?

**URL:** <https://discourse.julialang.org/t/fastmath-error/64750>\
**Category:** New to Julia\
**Tags:** fast-math\
**Created:** [July 16, 2021, 1:41pm UTC](https://discourse.julialang.org/t/fastmath-error/64750 "2021-07-16T13:41:24Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![nilshg](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nilshg/32/2283_2.png) [@nilshg](https://discourse.julialang.org/u/nilshg)\
**Post date:** [July 16, 2021, 1:54pm UTC](https://discourse.julialang.org/t/fastmath-error/64750/2 "2021-07-16T13:54:50Z")

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There was this discussion just now: [What's going on with exp() and --math-mode=fast? - #24 by Elrod](https://discourse.julialang.org/t/whats-going-on-with-exp-and-math-mode-fast/64619/24)

I think the general gist is `--math-mode=fast` is broken, don’t use it.

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_[View the full topic](https://discourse.julialang.org/t/fastmath-error/64750)._