tree 3a342d225d86f102bb65366de94a6e3a9b9d2780
parent ee1a6968525cb9fcd1f3c8e03e0c8d655070a1e4
author utatane.tea@gmail.com <utatane.tea@gmail.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1524873674 +0000
committer utatane.tea@gmail.com <utatane.tea@gmail.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1524873674 +0000

[JSC][ARM64][Linux] Add collectCPUFeatures using auxiliary vector
https://bugs.webkit.org/show_bug.cgi?id=185055

Reviewed by JF Bastien.

This patch is paving the way to emitting jscvt instruction if possible.
To do that, we need to determine jscvt instruction is supported in the
given CPU.

We add a function collectCPUFeatures, which is responsible to collect
CPU features if necessary. In Linux, we can use auxiliary vector to get
the information without parsing /proc/cpuinfo.

Currently, nobody calls this function. It is later called when we emit
jscvt instruction. To make it possible, we also need to add disassembler
support too.

* assembler/AbstractMacroAssembler.h:
* assembler/MacroAssemblerARM64.cpp:
(JSC::MacroAssemblerARM64::collectCPUFeatures):
* assembler/MacroAssemblerARM64.h:
* assembler/MacroAssemblerX86Common.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@231118 268f45cc-cd09-0410-ab3c-d52691b4dbfc