[flang-commits] [flang] [flang][OpenMP] Allocate `allocatable` init temps on the stack for GPUs (PR #164761)

[Kelvin Li via flang-commits]

kkwli wrote:

If the allocatable variable is mapped, reallocation by assignment is not allowed 

"If a list item of a map clause is an allocatable variable or is the subobject of an allocatable variable, the original list item must not be allocated, deallocated or reshaped while the corresponding list item has allocated storage."

"If the allocation status of a mapped variable or a list item that appears in a has_device_addr clause that has the ALLOCATABLE attribute is unallocated on entry to a target region, the allocation status of the corresponding variable in the device data environment must be unallocated upon exiting the region."

"If the allocation status of a mapped variable or a list item that appears in a has_device_addr clause that has the ALLOCATABLE attribute is allocated on entry to a target region, the allocation status and shape of the corresponding variable in the device data environment may not be changed, either explicitly or implicitly, in the region after entry to it."


https://github.com/llvm/llvm-project/pull/164761