# How to tell VS Code to use the fast math option?

**URL:** https://discourse.julialang.org/t/how-to-tell-vs-code-to-use-the-fast-math-option/18257
**Category:** VS Code
**Tags:** fast-math
**Created:** [December 3, 2018, 5:49pm UTC](https://discourse.julialang.org/t/how-to-tell-vs-code-to-use-the-fast-math-option/18257 "2018-12-03T17:49:21Z")
**Posts on this page:** 1
**Showing post:** 9

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### Author: ![Juan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/juan/32/7657_2.png) [@Juan](https://discourse.julialang.org/u/Juan)
#### Post date: [December 4, 2018, 11:29am UTC](https://discourse.julialang.org/t/how-to-tell-vs-code-to-use-the-fast-math-option/18257/9 "2018-12-04T11:29:24Z")

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I have opened another thread to discuss when shouldn’t we use @simd:

> [@When shouldn't we use @simd?](https://discourse.julialang.org/t/when-shouldnt-we-use-simd/18276):
>
> Hello. @simd documentations say: Warning: Incorrect use of the @simd macro may cause unexpected results. \* You are asserting it is safe to execute iterations in arbitrary or overlapping order, with special consideration for reduction variables. \* Floating-point operations on reduction variables must be reordered, possibly causing different results than without @simd. \* The object iterated over should be a one-dimensional range. \* The loop must be an innermost loop \* The loop body must be …

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