valgrind does this on i386:
#define ECB_MEMORY_FENCE __asm__ __volatile__ ("lock; orb
$0, -1(%%esp)" : : : "memory")
This code triggers a warning whenever it is executed under valgrind:
whatever is below the stack pointer is undefined memory by definition.
Not a good idea, as this causes legitimate warnings to get lost in the
noise. :-(
Please access a legitimate memory location instead.
--
-- Matthias Urlichs
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