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| author | Tobias Burnus <tobias@codesourcery.com> | 2023-10-12 21:00:58 +0200 |
|---|---|---|
| committer | Tobias Burnus <tobias@codesourcery.com> | 2023-10-12 21:00:58 +0200 |
| commit | 8bd11fa4ffcf8bceb6511a9d6918c90a34b705b5 (patch) | |
| tree | 1373c17bf865ded33cd46b23659cdeaa593727e8 /libgomp/libgomp.texi | |
| parent | f150717bd928df13642d31f010573a329b34689c (diff) | |
| download | gcc-8bd11fa4ffcf8bceb6511a9d6918c90a34b705b5.zip gcc-8bd11fa4ffcf8bceb6511a9d6918c90a34b705b5.tar.gz gcc-8bd11fa4ffcf8bceb6511a9d6918c90a34b705b5.tar.bz2 | |
libgomp.texi: Clarify OMP_TARGET_OFFLOAD=mandatory
In OpenMP 5.0/5.1, the semantic of OMP_TARGET_OFFLOAD=mandatory was
insufficiently specified; 5.2 clarified this with extensions/clarifications
(omp_initial_device, omp_invalid_device, "conforming device number").
GCC's implementation matches OpenMP 5.2.
libgomp/ChangeLog:
* libgomp.texi (OMP_DEFAULT_DEVICE): Update spec ref; add @ref to
OMP_TARGET_OFFLOAD.
(OMP_TARGET_OFFLOAD): Update spec ref; add @ref to OMP_DEFAULT_DEVICE;
clarify MANDATORY behavior.
Diffstat (limited to 'libgomp/libgomp.texi')
| -rw-r--r-- | libgomp/libgomp.texi | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/libgomp/libgomp.texi b/libgomp/libgomp.texi index ba8e901..6a77700 100644 --- a/libgomp/libgomp.texi +++ b/libgomp/libgomp.texi @@ -2831,9 +2831,10 @@ device number 0 will be used. @item @emph{See also}: @ref{omp_get_default_device}, @ref{omp_set_default_device}, +@ref{OMP_TARGET_OFFLOAD} @item @emph{Reference}: -@uref{https://www.openmp.org, OpenMP specification v4.5}, Section 4.13 +@uref{https://www.openmp.org, OpenMP specification v5.2}, Section 21.2.7 @end table @@ -3133,15 +3134,25 @@ variable can be set to one of three values - @code{MANDATORY}, @code{DISABLED} or @code{DEFAULT}. If set to @code{MANDATORY}, the program will terminate with an error if -the offload device is not present or is not supported. If set to -@code{DISABLED}, then offloading is disabled and all code will run on the -host. If set to @code{DEFAULT}, the program will try offloading to the +any device construct or device memory routine uses a device that is unavailable +or not supported by the implementation, or uses a non-conforming device number. +If set to @code{DISABLED}, then offloading is disabled and all code will run on +the host. If set to @code{DEFAULT}, the program will try offloading to the device first, then fall back to running code on the host if it cannot. If undefined, then the program will behave as if @code{DEFAULT} was set. +Note: Even with @code{MANDATORY}, there will be no run-time termination when +the device number in a @code{device} clause or argument to a device memory +routine is for host, which includes using the device number in the +@var{default-device-var} ICV. However, the initial value of +the @var{default-device-var} ICV is affected by @code{MANDATORY}. + +@item @emph{See also}: +@ref{OMP_DEFAULT_DEVICE} + @item @emph{Reference}: -@uref{https://www.openmp.org, OpenMP specification v5.0}, Section 6.17 +@uref{https://www.openmp.org, OpenMP specification v5.2}, Section 21.2.8 @end table |