Re: Efficiency of in-order vs. OoO

scott@slp53.sl.home (Scott Lurndal) writes:

There is a significant demand for performance monitoring.   Note
that in addition to to standard performance monitoring registers,
AArch64 also (optionally) supports statistical profiling and
out-of-band instruction tracing (ETF).   The demand from users
is such that all those features are present in most designs.

Interesting.  I would have expected that the likes of me are few and
far between, and easy to ignore for a big company like ARM, Intel or AMD.

My theory was that the CPU manufacturers put performance monitoring
counters in CPUs in order to understand the performance of real-world
programs themselves, and how they should tweak the successor core to
relieve it of bottlenecks.

- anton
--
'Anyone trying for "industrial quality" ISA should avoid undefined behavior.'
  Mitch Alsup, <c17fcd89-f024-40e7-a594-88a85ac10d20o@googlegroups.com>