Dedicated kernels for in-place dpt.divide and dpt.floor_divide (

#1431)

* Implements dedicated kernels for in-place division

Includes floor division and true division

* Adds tests for inplace division behavior

* Adds a `static_assert` check to TrueDivideInplaceTypeMapFactory

Checks that the result type is either the same as the third template parameter, or none

Adds a comment to TrueDivideInplaceOutputType

dpctl/tensor/_elementwise_funcs.py

@@ -590,6 +590,7 @@
     ti._divide_result_type,
     ti._divide,
     _divide_docstring_,
+    binary_inplace_fn=ti._divide_inplace,
     acceptance_fn=_acceptance_fn_divide,
 )
 
@@ -720,6 +721,7 @@
     ti._floor_divide_result_type,
     ti._floor_divide,
     _floor_divide_docstring_,
+    binary_inplace_fn=ti._floor_divide_inplace,
 )
 
 # B11: ==== GREATER       (x1, x2)

dpctl/tensor/libtensor/include/kernels/elementwise_functions/floor_divide.hpp

@@ -57,12 +57,7 @@ struct FloorDivideFunctor
 
     resT operator()(const argT1 &in1, const argT2 &in2) const
     {
-        if constexpr (std::is_same_v<argT1, bool> &&
-                      std::is_same_v<argT2, bool>) {
-            return (in2) ? static_cast<resT>(in1) : resT(0);
-        }
-        else if constexpr (std::is_integral_v<argT1> ||
-                           std::is_integral_v<argT2>) {
+        if constexpr (std::is_integral_v<argT1> || std::is_integral_v<argT2>) {
             if (in2 == argT2(0)) {
                 return resT(0);
             }
@@ -87,16 +82,7 @@ struct FloorDivideFunctor
     operator()(const sycl::vec<argT1, vec_sz> &in1,
                const sycl::vec<argT2, vec_sz> &in2) const
     {
-        if constexpr (std::is_same_v<argT1, bool> &&
-                      std::is_same_v<argT2, bool>) {
-            sycl::vec<resT, vec_sz> res;
-#pragma unroll
-            for (int i = 0; i < vec_sz; ++i) {
-                res[i] = (in2[i]) ? static_cast<resT>(in1[i]) : resT(0);
-            }
-            return res;
-        }
-        else if constexpr (std::is_integral_v<resT>) {
+        if constexpr (std::is_integral_v<resT>) {
             sycl::vec<resT, vec_sz> res;
 #pragma unroll
             for (int i = 0; i < vec_sz; ++i) {
@@ -165,7 +151,6 @@ template <typename T1, typename T2> struct FloorDivideOutputType
 {
     using value_type = typename std::disjunction< // disjunction is C++17
                                                   // feature, supported by DPC++
-        td_ns::BinaryTypeMapResultEntry<T1, bool, T2, bool, std::int8_t>,
         td_ns::BinaryTypeMapResultEntry<T1,
                                         std::uint8_t,
                                         T2,
@@ -315,6 +300,183 @@ struct FloorDivideStridedFactory
     }
 };
 
+template <typename argT, typename resT> struct FloorDivideInplaceFunctor
+{
+    using supports_sg_loadstore = std::true_type;
+    using supports_vec = std::true_type;
+
+    void operator()(resT &in1, const argT &in2) const
+    {
+        if constexpr (std::is_integral_v<resT>) {
+            if (in2 == argT(0)) {
+                in1 = 0;
+                return;
+            }
+            if constexpr (std::is_signed_v<resT>) {
+                auto tmp = in1;
+                in1 /= in2;
+                auto mod = tmp % in2;
+                auto corr = (mod != 0 && l_xor(mod < 0, in2 < 0));
+                in1 -= corr;
+            }
+            else {
+                in1 /= in2;
+            }
+        }
+        else {
+            in1 /= in2;
+            if (in1 == resT(0)) {
+                return;
+            }
+            in1 = std::floor(in1);
+        }
+    }
+
+    template <int vec_sz>
+    void operator()(sycl::vec<resT, vec_sz> &in1,
+                    const sycl::vec<argT, vec_sz> &in2) const
+    {
+        if constexpr (std::is_integral_v<resT>) {
+#pragma unroll
+            for (int i = 0; i < vec_sz; ++i) {
+                if (in2[i] == argT(0)) {
+                    in1[i] = 0;
+                }
+                else {
+                    if constexpr (std::is_signed_v<resT>) {
+                        auto tmp = in1[i];
+                        in1[i] /= in2[i];
+                        auto mod = tmp % in2[i];
+                        auto corr = (mod != 0 && l_xor(mod < 0, in2[i] < 0));
+                        in1[i] -= corr;
+                    }
+                    else {
+                        in1[i] /= in2[i];
+                    }
+                }
+            }
+        }
+        else {
+            in1 /= in2;
+#pragma unroll
+            for (int i = 0; i < vec_sz; ++i) {
+                if (in2[i] != argT(0)) {
+                    in1[i] = std::floor(in1[i]);
+                }
+            }
+        }
+    }
+
+private:
+    bool l_xor(bool b1, bool b2) const
+    {
+        return (b1 != b2);
+    }
+};
+
+template <typename argT,
+          typename resT,
+          unsigned int vec_sz = 4,
+          unsigned int n_vecs = 2>
+using FloorDivideInplaceContigFunctor =
+    elementwise_common::BinaryInplaceContigFunctor<
+        argT,
+        resT,
+        FloorDivideInplaceFunctor<argT, resT>,
+        vec_sz,
+        n_vecs>;
+
+template <typename argT, typename resT, typename IndexerT>
+using FloorDivideInplaceStridedFunctor =
+    elementwise_common::BinaryInplaceStridedFunctor<
+        argT,
+        resT,
+        IndexerT,
+        FloorDivideInplaceFunctor<argT, resT>>;
+
+template <typename argT,
+          typename resT,
+          unsigned int vec_sz,
+          unsigned int n_vecs>
+class floor_divide_inplace_contig_kernel;
+
+template <typename argTy, typename resTy>
+sycl::event
+floor_divide_inplace_contig_impl(sycl::queue &exec_q,
+                                 size_t nelems,
+                                 const char *arg_p,
+                                 py::ssize_t arg_offset,
+                                 char *res_p,
+                                 py::ssize_t res_offset,
+                                 const std::vector<sycl::event> &depends = {})
+{
+    return elementwise_common::binary_inplace_contig_impl<
+        argTy, resTy, FloorDivideInplaceContigFunctor,
+        floor_divide_inplace_contig_kernel>(exec_q, nelems, arg_p, arg_offset,
+                                            res_p, res_offset, depends);
+}
+
+template <typename fnT, typename T1, typename T2>
+struct FloorDivideInplaceContigFactory
+{
+    fnT get()
+    {
+        if constexpr (std::is_same_v<
+                          typename FloorDivideOutputType<T1, T2>::value_type,
+                          void>)
+        {
+            fnT fn = nullptr;
+            return fn;
+        }
+        else {
+            fnT fn = floor_divide_inplace_contig_impl<T1, T2>;
+            return fn;
+        }
+    }
+};
+
+template <typename resT, typename argT, typename IndexerT>
+class floor_divide_inplace_strided_kernel;
+
+template <typename argTy, typename resTy>
+sycl::event floor_divide_inplace_strided_impl(
+    sycl::queue &exec_q,
+    size_t nelems,
+    int nd,
+    const py::ssize_t *shape_and_strides,
+    const char *arg_p,
+    py::ssize_t arg_offset,
+    char *res_p,
+    py::ssize_t res_offset,
+    const std::vector<sycl::event> &depends,
+    const std::vector<sycl::event> &additional_depends)
+{
+    return elementwise_common::binary_inplace_strided_impl<
+        argTy, resTy, FloorDivideInplaceStridedFunctor,
+        floor_divide_inplace_strided_kernel>(
+        exec_q, nelems, nd, shape_and_strides, arg_p, arg_offset, res_p,
+        res_offset, depends, additional_depends);
+}
+
+template <typename fnT, typename T1, typename T2>
+struct FloorDivideInplaceStridedFactory
+{
+    fnT get()
+    {
+        if constexpr (std::is_same_v<
+                          typename FloorDivideOutputType<T1, T2>::value_type,
+                          void>)
+        {
+            fnT fn = nullptr;
+            return fn;
+        }
+        else {
+            fnT fn = floor_divide_inplace_strided_impl<T1, T2>;
+            return fn;
+        }
+    }
+};
+
 } // namespace floor_divide
 } // namespace kernels
 } // namespace tensor