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Teams: clarify behavior of split ops with strides <= 0 #519

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Aug 23, 2024
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Teams: clarify behavior of split ops with strides <= 0 #519

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4 changes: 4 additions & 0 deletions content/backmatter.tex
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Expand Up @@ -703,6 +703,10 @@ \section{Version 1.6}
additional arguments.
\ChangelogRef{subsec:shmem_pcontrol}
%
\item Clarified the behavior of \FUNC{shmem\_team\_split\_strided} when the
stride argument is 0 or negative.
\ChangelogRef{subsec:shmem_team_split_strided}
%
\end{itemize}

\section{Version 1.5}
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11 changes: 8 additions & 3 deletions content/shmem_team_split_strided.tex
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Expand Up @@ -50,10 +50,15 @@
i \in \mathbb{Z}_{size-1}
\end{equation*}
where $\mathbb{Z}$ is the set of natural numbers ($0, 1, \dots$), $N$ is the
number of \acp{PE} in the parent team and $size$ is a positive number indicating
the number of \acp{PE} in the new team. The index $i$ specifies the number of
the given PE in the new team. Thus, \acp{PE} in the new team remain in the same
number of \acp{PE} in the parent team, $size$ is a positive number indicating
the number of \acp{PE} in the new team, and $stride$ is an integer.
The index $i$ specifies the number of the given PE in the new team.
When $stride$ is greater than zero, PEs in the new team remain in the same
relative order as in the parent team.
When $stride$ is less than zero, PEs in the new team are in \textit{reverse}
relative order with respect to the parent team.
If a $stride$ value equal to 0 is passed to \FUNC{shmem\_team\_split\_strided},
then the $size$ argument passed must be 1, or the behavior is undefined.

This routine must be called by all \acp{PE} in the parent team.
All \acp{PE} must provide the same values for the \ac{PE} triplet.
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