https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
Jonathan Wakely changed:
What|Removed |Added
Resolution|--- |FIXED
Status|ASSIGNED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #26 from CVS Commits ---
The releases/gcc-10 branch has been updated by Jonathan Wakely
:
https://gcc.gnu.org/g:bbf9d358ae2104a09fc1b61e2b818928b6591831
commit r10-8448-gbbf9d358ae2104a09fc1b61e2b818928b6591831
Author: Jonathan Wake
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #25 from Avi Kivity ---
Requesting a backport to gcc 10. We're hitting this even when not called in a
loop.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
Jonathan Wakely changed:
What|Removed |Added
Status|NEW |ASSIGNED
Assignee|unassigned
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #24 from CVS Commits ---
The master branch has been updated by Jonathan Wakely :
https://gcc.gnu.org/g:a2d196e75cef95c2b70734ad02e94f9da0e769fe
commit r11-506-ga2d196e75cef95c2b70734ad02e94f9da0e769fe
Author: Jonathan Wakely
Date:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
Jonathan Wakely changed:
What|Removed |Added
Version|9.2.1 |10.1.0
Target Milestone|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #22 from Jonathan Wakely ---
(In reply to rguent...@suse.de from comment #20)
> Doh. OK, guess I'd set up the twister in all cases and make it
> programatically skip itself when rdrand/rdseed is available so we
> could easily fall b
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #21 from Jonathan Wakely ---
(In reply to rguent...@suse.de from comment #18)
> Note in virtualized environments support for RDRAND might be disabled
> while RDSEED is enabled(?) even if no such hardware configuration
> exists [by now
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #20 from rguenther at suse dot de ---
On Thu, 14 May 2020, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
>
> --- Comment #19 from Jonathan Wakely ---
> If you mean the mersenne twister in the s
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #19 from Jonathan Wakely ---
If you mean the mersenne twister in the std::random_device object, that's a
union member and doesn't exist when a proper source (/dev/random, rdrand,
rdseed etc) is available. So we'd need to add *another*
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #18 from rguenther at suse dot de ---
On Thu, 14 May 2020, hjl.tools at gmail dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
>
> --- Comment #15 from H.J. Lu ---
> (In reply to Jonathan Wakely from comment #13)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #17 from rguenther at suse dot de ---
On Thu, 14 May 2020, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
>
> --- Comment #14 from Jonathan Wakely ---
> (In reply to Jonathan Wakely from comment
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #16 from rguenther at suse dot de ---
On Thu, 14 May 2020, redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
>
> --- Comment #12 from Jonathan Wakely ---
> (In reply to wnereiz from comment #9)
> >
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #15 from H.J. Lu ---
(In reply to Jonathan Wakely from comment #13)
> We could do this easily enough (which could be simplified if RDRAND is
> guaranteed to be available when RDSEED is available):
>
All Intel processors with RDSEED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #14 from Jonathan Wakely ---
(In reply to Jonathan Wakely from comment #13)
> I'd rather not have to do everything shown at
> https://software.intel.com/content/www/us/en/develop/articles/intel-digital-
> random-number-generator-drng-
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #13 from Jonathan Wakely ---
We could do this easily enough (which could be simplified if RDRAND is
guaranteed to be available when RDSEED is available):
--- a/libstdc++-v3/src/c++11/random.cc
+++ b/libstdc++-v3/src/c++11/random.cc
@
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #12 from Jonathan Wakely ---
(In reply to wnereiz from comment #9)
> This issue seems not limit to a certain GCC version. I tried the code with
> gcc7, gcc9 and gcc10 on openSUSE Tumbleweed. All failed.
As Richard said, the code to u
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
Richard Biener changed:
What|Removed |Added
CC||hjl.tools at gmail dot com,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
Richard Biener changed:
What|Removed |Added
Ever confirmed|0 |1
Status|UNCONFIRMED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
wnereiz at kawashiro dot org changed:
What|Removed |Added
CC||wnereiz at kawashiro dot or
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #8 from Jonathan Wakely ---
Sorry, I read "Creating and using **a** `std::random_device` object fails when
used from multiple threads" to mean creating one object, and then apparently
didn't read the code properly to dispel my misunde
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
Carlos O'Ryan changed:
What|Removed |Added
Resolution|INVALID |---
Status|RESOLVED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
Jonathan Wakely changed:
What|Removed |Added
Resolution|--- |INVALID
Status|UNCONFIRMED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #4 from Carlos O'Ryan ---
(In reply to Andrew Pinski from comment #1)
> >The bug is *not* present on on Fedora:31 where the compiler reports:
>
> I doubt it is version based but rather based on what the CPU you are running
> on.
I
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #5 from Carlos O'Ryan ---
(In reply to Andrew Pinski from comment #2)
> (In reply to Andrew Pinski from comment #1)
> > >The bug is *not* present on on Fedora:31 where the compiler reports:
> >
> > I doubt it is version based but rat
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #3 from Andrew Pinski ---
https://software.intel.com/sites/default/files/managed/98/4a/DRNG_Software_Implementation_Guide_2.1.pdf
5.3.1 Retry Recommendations
...
If only one thread is calling RDSEED infrequently, it is very unlikely
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #1 from Andrew Pinski ---
>The bug is *not* present on on Fedora:31 where the compiler reports:
I doubt it is version based but rather based on what the CPU you are running
on.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94087
--- Comment #2 from Andrew Pinski ---
(In reply to Andrew Pinski from comment #1)
> >The bug is *not* present on on Fedora:31 where the compiler reports:
>
> I doubt it is version based but rather based on what the CPU you are running
> on.
I M
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