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[flang][cuda] Support corner case of data transfer #132451

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merged 1 commit into from
Mar 21, 2025
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[flang][cuda] Support corner case of data transfer #132451

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18 changes: 16 additions & 2 deletions flang-rt/lib/cuda/memory.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@

#include "flang/Runtime/CUDA/memory.h"
#include "flang-rt/runtime/assign-impl.h"
#include "flang-rt/runtime/descriptor.h"
#include "flang-rt/runtime/terminator.h"
#include "flang/Runtime/CUDA/common.h"
#include "flang/Runtime/CUDA/descriptor.h"
Expand Down Expand Up @@ -98,8 +99,21 @@ void RTDECL(CUFDataTransferDescDesc)(Descriptor *dstDesc, Descriptor *srcDesc,
} else {
terminator.Crash("host to host copy not supported");
}
Fortran::runtime::Assign(
*dstDesc, *srcDesc, terminator, MaybeReallocate, memmoveFct);
if ((srcDesc->rank() > 0) && (dstDesc->Elements() < srcDesc->Elements())) {
// Special case when rhs is bigger than lhs and both are contiguous arrays.
// In this case we do a simple ptr to ptr transfer with the size of lhs.
// This is be allowed in the reference compiler and it avoids error
// triggered in the Assign runtime function used for the main case below.
if (!srcDesc->IsContiguous() || !dstDesc->IsContiguous())
terminator.Crash("Unsupported data transfer: mismatching element counts "
"with non-contiguous arrays");
RTNAME(CUFDataTransferPtrPtr)(dstDesc->raw().base_addr,
srcDesc->raw().base_addr, dstDesc->Elements() * dstDesc->ElementBytes(),
mode, sourceFile, sourceLine);
} else {
Fortran::runtime::Assign(
*dstDesc, *srcDesc, terminator, MaybeReallocate, memmoveFct);
}
}

void RTDECL(CUFDataTransferCstDesc)(Descriptor *dstDesc, Descriptor *srcDesc,
Expand Down