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  1. JDK
  2. JDK-8245137

aarch64 ICache flush depends on enabling gnu extensions

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    • Enhancement
    • Resolution: Fixed
    • P4
    • 15
    • openjdk8u292, 11, 15
    • hotspot
    • b24
    • aarch64

    Description

      For aarch64, ICache::invalidate_word/range contain calls to the undeclared function __clear_cache. This works when using -std=gnu++<whatever>, but not when using -std=c++<whatever>.

      This works today because we are using -std=gnu++98. However, when providing C++14 support (JDK-8208089) the plan is to use -std=c++14 and not enable gnu extensions. That call to __clear_cache is the only place that currently requires gnu extensions. It would be undesirable to enable gnu extensions in shared code just to allow this one use platform-specific code.

      This can be solved by using __builtin___clear_cache instead of calling __clear_cache directly.

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              kbarrett Kim Barrett
              kbarrett Kim Barrett
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                Updated:
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