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* [Bug target/97338] New: [nvptx] Convergence checking
@ 2020-10-08 16:14 vries at gcc dot gnu.org
2022-02-23 11:45 ` [Bug target/97338] " vries at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: vries at gcc dot gnu.org @ 2020-10-08 16:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97338
Bug ID: 97338
Summary: [nvptx] Convergence checking
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
With ptx, we have insns that need to be executed in convergent mode, that is,
all threads in the warp active.
We can unfortunately not enforce this, but we could check it, which could help
pinpoint problems.
A ptx insn:
...
vote.ballot.b32 %rbla, 1;
...
gives us the regmask of active threads, so we could check:
...
{
.reg .u32 %rwarp_active_mask;
vote.ballot.b32 %rwarp_active_mask, 1;
.reg .pred %pconvergent;
setp.eq.u32 %pconvergent,%rwarp_active_mask,-1;
@ ! %pconvergent trap;
}
...
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug target/97338] [nvptx] Convergence checking
2020-10-08 16:14 [Bug target/97338] New: [nvptx] Convergence checking vries at gcc dot gnu.org
@ 2022-02-23 11:45 ` vries at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: vries at gcc dot gnu.org @ 2022-02-23 11:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97338
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Target Milestone|--- |12.0
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
openacc:
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=f32f74c2e8cef5fe37af6d4e8d7e8f6b4c8ae9a8
openmp:
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=8e5c34ab45f34aadea65c5ba33ec685264b6ec66
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-10-08 16:14 [Bug target/97338] New: [nvptx] Convergence checking vries at gcc dot gnu.org
2022-02-23 11:45 ` [Bug target/97338] " vries at gcc dot gnu.org
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