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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/97338] New: [nvptx] Convergence checking Date: Thu, 08 Oct 2020 16:14:18 +0000 [thread overview] Message-ID: <bug-97338-4@http.gcc.gnu.org/bugzilla/> (raw) 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; } ...
next reply other threads:[~2020-10-08 16:14 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-10-08 16:14 vries at gcc dot gnu.org [this message] 2022-02-23 11:45 ` [Bug target/97338] " vries at gcc dot gnu.org
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