57 lines
2.0 KiB
Diff
57 lines
2.0 KiB
Diff
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BloCxx Bug #2799341:
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https://sourceforge.net/tracker/?func=detail&aid=2799341&group_id=176030&atid=875611
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BloCxx SVN Repository:
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https://blocxx.svn.sourceforge.net/svnroot/blocxx/
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Index: trunk/src/blocxx/MemoryBarrier.hpp
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===================================================================
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--- trunk/src/blocxx/MemoryBarrier.hpp (Revision 226)
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+++ trunk/src/blocxx/MemoryBarrier.hpp (Revision 411)
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@@ -51,30 +51,35 @@
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*/
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inline void readWriteMemoryBarrier()
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{
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- #if defined(__alpha)
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+#if defined(__GNUC__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1))
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+ // The GCC compiler-provided synchronization routine is better for
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+ // optimization than any inline assembly we can provide.
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+ __sync_synchronize();
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+
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+#elif defined(__alpha)
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// DEC/COMPAQ/HP Alpha
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__asm__ __volatile__("mb");
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- #elif defined(__HP_aCC) && defined(BLOCXX_ARCH_IA64)
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+#elif defined(__HP_aCC) && defined(BLOCXX_ARCH_IA64)
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// Itanium (useable with aCC as the compiler).
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_Asm_mf();
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- #elif defined(BLOCXX_ARCH_IA64)
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+#elif defined(BLOCXX_ARCH_IA64)
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// Intel Itanium
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__asm__ __volatile__("mf");
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- #elif defined(BLOCXX_ARCH_PPC) || defined(BLOCXX_ARCH_PPC64)
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+#elif defined(BLOCXX_ARCH_PPC) || defined(BLOCXX_ARCH_PPC64)
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// PPC/PPC64
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__asm__ __volatile__ ("sync" : : : "memory");
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- #elif defined(BLOCXX_ARCH_S390) || defined(BLOCXX_ARCH_S390X)
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+#elif defined(BLOCXX_ARCH_S390) || defined(BLOCXX_ARCH_S390X)
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// s390/s390x
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__asm__ __volatile__ ( "bcr 15,0" : : : "memory" );
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- #elif defined(BLOCXX_ARCH_X86_64) || defined(BLOCXX_ARCH_X86) || defined(BLOCXX_ARCH_HPPA20) || defined(BLOCXX_ARCH_SPARC)
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+#elif defined(BLOCXX_ARCH_X86_64) || defined(BLOCXX_ARCH_X86) || defined(BLOCXX_ARCH_HPPA20) || defined(BLOCXX_ARCH_SPARC)
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// Nothing required for these architectures.
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- #else // if defined(BLOCXX_ARCH_UNKNOWN)
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- #error "Unknown architecture. readWriteMemoryBarrier() must be updated"
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- #endif
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+#else // if defined(BLOCXX_ARCH_UNKNOWN)
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+#error "Unknown architecture. readWriteMemoryBarrier() must be updated"
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+#endif
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}
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} // end namespace BLOCXX_NAMESPACE
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