/SYNCHRONOUS_EXCEPTIONS (Alpha only) D=/NOSYNCHRONOUS_EXCEPTIONS

 /[NO]SYNCHRONOUS_EXCEPTIONS

 Controls whether an exception is associated with the instruction
 that caused it.  Specifying /SYNCHRONOUS_EXCEPTIONS slows program
 execution, so only use it when debugging a specific problem, such
 as locating the source of an exception.

 The default, /NOSYNCHRONOUS_EXCEPTIONS, is used where exceptions
 can be reported imprecisely one or more instructions after the
 instruction that caused the exception.

 Specifying /IEEE_MODE=FAST (the default) provides imprecise
 exception reporting (same as /NOSYNCHRONOUS_EXCEPTIONS).
 Specifying other /IEEE_MODE keywords provides precise exception
 reporting (same as /SYNCHRONOUS_EXCEPTIONS).