https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
--- Comment #11 from Khem Raj ---
yes thanks. I have done so https://jira.mongodb.org/browse/SERVER-65664
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
--- Comment #10 from Andrew Pinski ---
No. The issue is the two constants and cache line size are different. Basically
the whole code should not say cache line aligned but rather use them based on
what they mean.
Report the issue to the mongodb
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
--- Comment #9 from Khem Raj ---
how does something like this look ?
#include
#include
#include
#include
#ifdef __cpp_lib_hardware_interference_size
using std::hardware_constructive_interference_size;
using
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
--- Comment #8 from Khem Raj ---
So in this case if I change
static_assert(sizeof(decltype(_together)) <=
hardware_constructive_interference_size,
"cache line spill");
to
static_assert(sizeof(decltype(_together))
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
--- Comment #7 from Andrew Pinski ---
mongodb is using these two values incorrectly and even misunderstanding what
they mean.
hardware_constructive_interference_size means the Minimum offset between two
objects which will avoid false sharing.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
--- Comment #6 from Khem Raj ---
this is from mongodb.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
--- Comment #5 from Andrew Pinski ---
(In reply to Khem Raj from comment #4)
> I dont think its a bug per-se, I am looking for fixing it right way. Should
> I pass a non-default value via gcc cmdline or adjust the size expectations
> in code.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
--- Comment #4 from Khem Raj ---
I dont think its a bug per-se, I am looking for fixing it right way. Should I
pass a non-default value via gcc cmdline or adjust the size expectations in
code.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
Andrew Pinski changed:
What|Removed |Added
Status|UNCONFIRMED |RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
--- Comment #2 from Jonathan Wakely ---
(In reply to Khem Raj from comment #0)
> This testcase below fails to compile with gcc12 on aarch64 but works ok with
> gcc11
[...]
> #ifdef __cpp_lib_hardware_interference_size
> using
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105251
Andrew Pinski changed:
What|Removed |Added
Component|c++ |target
--- Comment #1 from Andrew
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