Xcode arm64 Vs arm64e

Xcode 10.1 mention Support for arm64e (Preview). Anyone have any idea about arm64e. Any difference between arm64 and arm64e.

https://developer.apple.com/documentation/xcode_release_notes/xcode_10_1_beta_2_release_notes?language=objc

I searched arm64e, but couldn't find any proper explanation.

The arm64e architecture is used on the A12 chipset, which is added in the latest 2018 iPhone models (XS/XS Max/XR). The code compiles to ARMv8.3, which brings support for new features. Namely:

• Pointer authentication
• Nested virtualization
• Advanced SIMD complex number support
• Improved Javascript data type conversion support
• A change to the memory consistency model
• ID mechanism support for larger system-visible caches

The A12 features an Apple-designed 64-bit ARMv8.3-A six-core CPU

https://en.wikipedia.org/wiki/Apple_A12

Read more about the architecture here as well:

https://community.arm.com/processors/b/blog/posts/armv8-a-architecture-2016-additions