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authorRickard Green <[email protected]>2015-01-05 11:04:34 +0100
committerRickard Green <[email protected]>2015-01-14 20:24:45 +0100
commit24fa075b5c0d54f2035a2ff510a82aa19187eda4 (patch)
tree2e26371bbcf360ae53f75c6bad1799aa375c1b72 /xcomp
parentce73c38b10d1dee5209b505ef054b108e747b522 (diff)
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Improve ethread atomics based on GCC builtins
* Use of __atomic builtins when available. * Improved configure test that checks for missing memory barrier in __sync_synchronize(). The old approach was to verify known working gcc versions and check gcc version at compile time. Besides not being very safe, the old approach often unnecessarily caused usage of the very expensive workaround. * Introduced (no overhead) workaround for missing clobber in __sync_synchronize() when using buggy LLVM implementation of __sync_synchronize(). * Implement native memory barriers for ARM processors supporting the DMB instruction. * Use of volatile store on Alpha as atomic set operation if no __atomic_store_n() is available (already used on x86/x86_64 Sparc V9, PowerPC, and MIPS). Fallback used when not using volatile store is typically very expensive. * Use volatile load on Alpha and ARM as atomic read operation if no __atomic_load_n() is available (already used on x86/x86_64 Sparc V9, PowerPC, and MIPS). Fallback when not using volatile load is typically very expensive.
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