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From: Paul <nospam@needed.invalid>
Newsgroups: comp.lang.c
Subject: Re: DECIMAL POINT IS COMMA
Date: Mon, 16 Sep 2024 15:15:09 -0400
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On Mon, 9/16/2024 6:56 AM, Bonita Montero wrote:
> Am 16.09.2024 um 08:43 schrieb Lawrence D'Oliveiro:
> 
>> This posting was completely baffling to me, until I realized ...
> 
> I'm from Europe and I can handle both types of decimal points.
> 

I'm from "somewhere" and 1000 is 1000 here. Punctuation
is for Excel spreadsheets :-)

*******

The hardware has a declaration, so in principle you don't
even have to measure anything.

   "Since the family 10h (Barcelona/Phenom), AMD chips feature a constant TSC,
    which can be driven either by the HyperTransport speed or the highest P state.
    A CPUID bit (Fn8000_0007:EDX_8) advertises this;
    Intel-CPUs also report their invariant TSC on that bit."

In Linux, there is "constant_tsc" in the CPU feature list.
Both my machines have it (an Intel machine ten years old,
an AMD machine two years old). Your machine would list it
in /proc/cpuinfo.

So you didn't write that code for your 7950X, since you
could just check the CPU feature bit instead for the
property of "constant_tsc", AKA invariant TSC. Your CPU
is not "synchronized" -- the hardware just does not vary
across the face of the CPU. It's like an entirely different
feature in a sense.

The way Wiki puts this:

   "The specific processor configuration determines the behavior.
    Constant TSC behavior ensures that the duration of each clock tick
    is uniform and makes it possible to use the TSC as a wall-clock timer
    even if the processor core changes frequency. This is the
    architectural behavior for all later Intel processors."

   Paul