A new kind of weak (in)consistency model
From
Thomas Koenig@3:633/10 to
All on Sun Aug 16 12:10:14 2026
This is one is interesting, and even weaker than the Alpha,
On LoongArch, you if you read from the same address twice,
you cannot be sure without synchronization that you get
the reads ordered correctly,
So, if on the the writer side, you have (where x is in memory)
x = 1;
x = 2;
and on the reader side
a = x;
b = x;
you can have a=2 and b=1 as a result.
They don't even have this in their English documentation, but
it caused a bug in gfortran recently, gcc.gnu.org/PR118935 .
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