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Add caveat to __builtin_readcyclecounter documentation.

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The ARM cycle-counter can be restricted by the operating system; it's
worth warning potential users of this issue.

llvm-svn: 182604
This commit is contained in:
Tim Northover 2013-05-23 19:14:12 +00:00
parent bc93308489
commit bfe2e5f778
1 changed files with 3 additions and 1 deletions
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4
clang/docs/LanguageExtensions.rst
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@ -1410,7 +1410,9 @@ should only be used for timing small intervals. When not supported by the
target, the return value is always zero. This builtin takes no arguments and
produces an unsigned long long result.
Query for this feature with ``__has_builtin(__builtin_readcyclecounter)``.
Query for this feature with ``__has_builtin(__builtin_readcyclecounter)``. Note
that even if present, its use may depend on run-time privilege or other OS
controlled state.
.. _langext-__builtin_shufflevector: