Reviewers: ulan, jochen, rmcilroy,
Description:
A64: Fix and improve atomic operations.
* The 'compare and swap' operations should enforce memory ordering even when
the exchange does not occur.
* The exclusive monitor does not need to be cleared by CLREX if a LDRX was
not followed by a matching STREX.
* Use LDAR and STLR where possible.
* Use the 'Q' constraint where possible. This Aarch64 constraint indicates
"a memory address which uses a single base register with no offset". It
allows
us to remove 'memory' from the clobber list.
* Use the 'I' and 'J' constraints to hint for constants valid for immediate
values.
* Avoid code duplication.
Please review this at https://codereview.chromium.org/220793002/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files (+53, -102 lines):
M src/atomicops_internals_arm64_gcc.h
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