[Webkit-unassigned] [Bug 138499] Enable Cortex-A53-specific code paths by default if core is detected

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138499

Akos Kiss <akiss at inf.u-szeged.hu> changed:

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--- Comment #3 from Akos Kiss <akiss at inf.u-szeged.hu> ---
Created attachment 241176
  --> https://bugs.webkit.org/attachment.cgi?id=241176&action=review
Proposed patch, v2

The updated patch now checks for 0xd03 only in the CPU part line, as requested. Also, comments are added. 

Moreover, the patch executes the check multiple times, once for each available core, because the /proc/cpuinfo API is somewhat strange on ARM64 and the result depends on the core the query is executed on. This might conceal the presence of an A53 core in a heterogeneous setup.

Option and _INITIALVALUE are used to allow explicit setting of WTF_CPU_ARM64_CORTEXA53 from command line, independently from the result of the detection.

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