https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113004
Bug ID: 113004
Summary: OpenMP 5 - structs are not mapped element-wise by
default
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: jules at gcc dot gnu.org
Target Milestone: ---
According to e.g. OpenMP 5.2, "5.8.2 Mapper Identifiers and mapper Modifiers":
"A structure type T has a predefined default mapper that is defined as if by a
declare mapper directive that specifies v in a map clause with the alloc
map-type and each structure element of v in a map clause with the tofrom
map-type."
At present, a variable of struct type will be mapped as as a single block (the
pre-OpenMP 5.0 legacy behaviour).
This works fine most of the time, but for example fails in the case where one
of the struct's members is a reference, demonstrated in the test case:
libgomp/testsuite/libgomp.c++/target-49.C
Once "declare mapper" support is committed, cases where a struct with an
implicit default mapper should invoke a struct with a *non*-default mapper,
will also probably be mishandled.
