aten/src/ATen/ScalarOps.cpp

#define TORCH_ASSERT_ONLY_METHOD_OPERATORS
#include <ATen/Dispatch.h>
#include <ATen/EmptyTensor.h>
#include <ATen/ScalarOps.h>

namespace at {
namespace {
template <typename scalar_t>
inline void fill_inplace(Tensor& self, const Scalar& value_scalar) {
  auto value = value_scalar.to<scalar_t>();
  scalar_t* dptr = static_cast<scalar_t*>(self.data_ptr());
  *dptr = value;
}
}

namespace detail {
Tensor& scalar_fill(Tensor& self, const Scalar& value) {
  AT_DISPATCH_ALL_TYPES_AND_COMPLEX_AND4(
      kComplexHalf, kHalf, kBool, kBFloat16, self.scalar_type(), "fill_out", [&]() {
        fill_inplace<scalar_t>(self, value);
      });
  return self;
}

Tensor scalar_tensor_static(const Scalar& s, c10::optional<ScalarType> dtype_opt, c10::optional<Device> device_opt) {
  at::tracer::impl::NoTracerDispatchMode tracer_guard;
  at::AutoDispatchBelowAutograd mode;
  Tensor result = at::detail::empty_cpu(
      {}, dtype_opt, c10::nullopt, device_opt, c10::nullopt, c10::nullopt);
  scalar_fill(result, s);
  return result;
}
} // namespace detail
} // namespace at