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Single asm instruction

Hi,
AFAIK, embedded assembly code (__asm) can not be optimized by the
compiler.
I heard through the grapevine that you can embed a single assembly
instruction,
using a "__" prefix, and in this case the compiler CAN optimize. The
code.
Is this correct ?
What's the exact syntax ?
Where is this documented ?
 
TIA
 
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