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# mathMode

An indication of whether the compiler can perform optimizations for floating-point arithmetic that may violate the IEEE 754 standard.

```
var mathMode: MTLMathMode { get set }
```

## Discussion

This property replaces the [`fastMathEnabled`](/documentation/Metal/MTLCompileOptions/fastMathEnabled) property.

If [`fastMathEnabled`](/documentation/Metal/MTLCompileOptions/fastMathEnabled) is `true`, the system sets [`mathMode`](/documentation/Metal/MTLCompileOptions/mathMode) to [`MTLMathMode.fast`](/documentation/Metal/MTLMathMode/fast) and [`mathFloatingPointFunctions`](/documentation/Metal/MTLCompileOptions/mathFloatingPointFunctions) to [`MTLMathFloatingPointFunctions.fast`](/documentation/Metal/MTLMathFloatingPointFunctions/fast).

If [`fastMathEnabled`](/documentation/Metal/MTLCompileOptions/fastMathEnabled) is `false`, the system sets [`mathMode`](/documentation/Metal/MTLCompileOptions/mathMode) to [`MTLMathMode.safe`](/documentation/Metal/MTLMathMode/safe) and [`mathFloatingPointFunctions`](/documentation/Metal/MTLCompileOptions/mathFloatingPointFunctions) to [`MTLMathFloatingPointFunctions.precise`](/documentation/Metal/MTLMathFloatingPointFunctions/precise).

Subsequent calls to [`mathMode`](/documentation/Metal/MTLCompileOptions/mathMode) or [`mathFloatingPointFunctions`](/documentation/Metal/MTLCompileOptions/mathFloatingPointFunctions) set the variables directly.

## Topics

### Supporting types

[`MTLMathMode`](/documentation/Metal/MTLMathMode)

An indication of whether the compiler can perform optimizations for floating-point arithmetic that may violate the IEEE 754 standard.


---

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