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The problem was that the x86 assembly based atomic CAS (compare and swap) implementation could copy the wrong value to the ebx register, where the cmpxchg8b expects to see part of the "comparand" value. Since the original value in the ebx register is saved in the stack (that is, the push instruction causes the stack pointer to change), a wrong offset could be used if the compiler decides to put the source of the comparand value in the stack. The solution is to copy the comparand value directly from memory. Since the comparand value is 64-bits wide, it is copied in two steps over to the ebx and ecx registers. |
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| .. | ||
| gcc_builtins.h | ||
| generic-msvc.h | ||
| nolock.h | ||
| rwlock.h | ||
| solaris.h | ||
| x86-gcc.h | ||