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Enable compressed pointers for arm64 #220

@swift-kim

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@swift-kim

https://medium.com/dartlang/dart-2-15-7e7a598e508a#0c15

The feature is currently only enabled for Android 64-bit by default.

engine/tools/gn

Lines 389 to 391 in a0668c0

# Enable pointer compression on 64-bit mobile targets.
if args.target_os in ['android'] and gn_args['target_cpu'] in ['x64' , 'arm64']:
gn_args['dart_use_compressed_pointers'] = True

We need to check if it can be enabled for Tizen arm64 targets.

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