Fix a bug in IndexKernel data overflow (#39891)

paddle/fluid/operators/index_impl.cu.h

@@ -31,24 +31,24 @@ namespace operators {
 
 namespace kps = phi::kps;
 template <typename T, typename Functor, int VecSize>
-__global__ void VectorizedIndexKernel(T *out, int numel, int main_offset,
+__global__ void VectorizedIndexKernel(T *out, size_t numel, size_t main_offset,
                                       Functor func) {
-  int data_offset = BLOCK_ID_X * BLOCK_NUM_X * VecSize;
-  int stride = BLOCK_NUM_X * GRID_NUM_X * VecSize;
-  int args[VecSize];
+  size_t data_offset = BLOCK_ID_X * BLOCK_NUM_X * VecSize;
+  size_t stride = BLOCK_NUM_X * GRID_NUM_X * VecSize;
+  size_t args[VecSize];
   T result[VecSize];
   for (; data_offset < main_offset; data_offset += stride) {
-    kps::InitWithDataIndex<int, VecSize, 1, 1>(&args[0], data_offset);
-    kps::ElementwiseUnary<int, T, VecSize, 1, 1, Functor>(&result[0], &args[0],
-                                                          func);
+    kps::InitWithDataIndex<size_t, VecSize, 1, 1>(&args[0], data_offset);
+    kps::ElementwiseUnary<size_t, T, VecSize, 1, 1, Functor>(&result[0],
+                                                             &args[0], func);
     kps::WriteData<T, VecSize, 1, 1, false>(out + data_offset, &result[0],
                                             BLOCK_NUM_X * VecSize);
   }
-  int num = numel - data_offset;
+  size_t num = numel - data_offset;
   if (num > 0) {
-    kps::InitWithDataIndex<int, VecSize, 1, 1>(&args[0], data_offset);
-    kps::ElementwiseUnary<int, T, VecSize, 1, 1, Functor>(&result[0], &args[0],
-                                                          func);
+    kps::InitWithDataIndex<size_t, VecSize, 1, 1>(&args[0], data_offset);
+    kps::ElementwiseUnary<size_t, T, VecSize, 1, 1, Functor>(&result[0],
+                                                             &args[0], func);
     kps::WriteData<T, VecSize, 1, 1, true>(out + data_offset, &result[0], num);
   }
 }
@@ -58,7 +58,7 @@ void IndexKernel(const KPDevice &dev_ctx, Tensor *out, Functor func) {
   int numel = out->numel();
   T *out_data = out->mutable_data<T>(dev_ctx.GetPlace());
   if (numel <= 0) return;
-  int vec_size = paddle::platform::GetVectorizedSize((out->data<T>()));
+  int vec_size = paddle::platform::GetVectorizedSize(out_data);
 #ifdef PADDLE_WITH_XPU_KP
   int block = 64;
   int grid = 8;
@@ -70,8 +70,7 @@ void IndexKernel(const KPDevice &dev_ctx, Tensor *out, Functor func) {
   int block = config.thread_per_block.x;
   auto stream = dev_ctx.stream();
 #endif
-
-  int main_offset = (numel / (vec_size * block)) * vec_size * block;
+  size_t main_offset = (numel / (vec_size * block)) * vec_size * block;
   switch (vec_size) {
     case 4:
       VectorizedIndexKernel<T, Functor, 4><<<grid, block, 0, stream>>>(