Intel® DPC++ Compatibility Tool Developer Guide and Reference
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DPCT1083
Message
The size of <placeholder> in the migrated code may be different from the original code. Check that the allocated memory size in the migrated code is correct.
Detailed Help
Some types have a different size in the migrated code than in the original code, for example sycl::float3 compared to float3. Check if the allocated size of memory is correct in the migrated code.
In the example below, 3*sizeof(float) is used to represent the size of float3 in the original code. In the migrated code the size of sycl::float3 is different, so the allocated size needs adjustment.
For example, this original CUDA* code:
__global__ void kernel() {
extern __shared__ float3 shared_memory[];
...
}
void foo() {
size_t shared_size = 3 * sizeof(float);
kernel<<<1, 1, shared_size>>>();
}results in the following migrated SYCL* code:
void kernel(uint8_t *dpct_local) {
auto shared_memory = (sycl::float3 *)dpct_local;
...
}
void foo() {
/*
DPCT1083:0: The size of local memory in the migrated code may be different
from the original code. Check that the allocated memory size in the migrated
code is correct.
*/
size_t shared_size = 3 * sizeof(float);
dpct::get_in_order_queue().submit([&](sycl::handler &cgh) {
sycl::local_accessor<uint8_t, 1> dpct_local_acc_ct1(
sycl::range<1>(shared_size), cgh);
cgh.parallel_for(
sycl::nd_range<3>(sycl::range<3>(1, 1, 1), sycl::range<3>(1, 1, 1)),
[=](sycl::nd_item<3> item_ct1) {
kernel(dpct_local_acc_ct1.get_pointer());
});
});
}which is manually adjusted to:
void kernel(uint8_t *dpct_local) {
auto shared_memory = (sycl::float3 *)dpct_local;
...
}
void foo() {
size_t shared_size = 1 * sizeof(sycl::float3);
dpct::get_in_order_queue().submit([&](sycl::handler &cgh) {
sycl::local_accessor<uint8_t, 1> dpct_local_acc_ct1(
sycl::range<1>(shared_size), cgh);
cgh.parallel_for(
sycl::nd_range<3>(sycl::range<3>(1, 1, 1), sycl::range<3>(1, 1, 1)),
[=](sycl::nd_item<3> item_ct1) {
kernel(dpct_local_acc_ct1.get_pointer());
});
});
}Suggestions to Fix
Check the allocated size of memory and replace it with the correct size if necessary.