Add debug logging to failing set_fwd_strides call

conda-recipe/run_test.bat

@@ -37,5 +37,5 @@ if %errorlevel% neq 0 exit 1
 "%PYTHON%" -m dpctl -f
 if %errorlevel% neq 0 exit 1
 
-"%PYTHON%" -m pytest -ra --pyargs dpnp
+"%PYTHON%" -m pytest -s -ra --pyargs dpnp
 if %errorlevel% neq 0 exit 1

dpnp/backend/extensions/fft/common.hpp

@@ -28,12 +28,32 @@
 
 #pragma once
 
+#include <iostream>
 #include <stdexcept>
+#include <type_traits>
+#include <typeinfo>
+
+// cxxabi.h is only available on GCC/Clang, not on MSVC
+#ifdef __GNUC__
+#include <cxxabi.h>
+#endif
 
 #include <oneapi/mkl.hpp>
 #include <pybind11/pybind11.h>
 #include <sycl/sycl.hpp>
 
+// Compile-time tracing: Show which API version is being used
+#ifdef INTEL_MKL_VERSION
+#pragma message("INTEL_MKL_VERSION is defined: " __DATE__)
+#if INTEL_MKL_VERSION >= 20250000
+#pragma message("Using NEW MKL API (>= 2025.0): vector-based interface")
+#else
+#pragma message("Using OLD MKL API (< 2025.0): pointer-based interface")
+#endif
+#else
+#pragma message("WARNING: INTEL_MKL_VERSION is not defined!")
+#endif
+
 namespace dpnp::extensions::fft
 {
 namespace mkl_dft = oneapi::mkl::dft;
@@ -130,9 +150,36 @@ class DescriptorWrapper
             throw py::value_error(
                 "Strides length does not match descriptor's dimension");
         }
+
+        // Runtime tracing: log type information
+        std::cerr << "[TRACE] set_fwd_strides:" << std::endl;
+        std::cerr << "  - INTEL_MKL_VERSION: " << INTEL_MKL_VERSION
+                  << std::endl;
+#ifdef __GNUC__
+        // Demangle type name on GCC/Clang
+        int status;
+        char *demangled =
+            abi::__cxa_demangle(typeid(valT).name(), nullptr, nullptr, &status);
+        std::cerr << "  - valT type: "
+                  << (status == 0 ? demangled : typeid(valT).name())
+                  << std::endl;
+        if (demangled)
+            free(demangled);
+#else
+        // On MSVC, just print mangled name
+        std::cerr << "  - valT type: " << typeid(valT).name() << std::endl;
+#endif
+        std::cerr << "  - valT::value_type == std::int64_t: "
+                  << std::is_same_v<typename valT::value_type,
+                                    std::int64_t> << std::endl;
+
 #if INTEL_MKL_VERSION >= 20250000
+        std::cerr << "  - API: NEW (passing vector object)" << std::endl;
+        std::cerr.flush(); // Force output to be visible in pytest
         descr_.set_value(mkl_dft::config_param::FWD_STRIDES, strides);
 #else
+        std::cerr << "  - API: OLD (passing data pointer)" << std::endl;
+        std::cerr.flush(); // Force output to be visible in pytest
         descr_.set_value(mkl_dft::config_param::FWD_STRIDES, strides.data());
 #endif // INTEL_MKL_VERSION
     }
@@ -162,9 +209,37 @@ class DescriptorWrapper
             throw py::value_error(
                 "Strides length does not match descriptor's dimension");
         }
+
+        // Runtime tracing: log type information
+        std::cerr << "[TRACE] set_bwd_strides:" << std::endl;
+        std::cerr << "  - INTEL_MKL_VERSION: " << INTEL_MKL_VERSION
+                  << std::endl;
+#ifdef __GNUC__
+        // Demangle type name on GCC/Clang
+        int status;
+        char *demangled =
+            abi::__cxa_demangle(typeid(valT).name(), nullptr, nullptr, &status);
+        std::cerr << "  - valT type: "
+                  << (status == 0 ? demangled : typeid(valT).name())
+                  << std::endl;
+        if (demangled)
+            free(demangled);
+#else
+        // On MSVC, just print mangled name
+        std::cerr << "  - valT type: " << typeid(valT).name() << std::endl;
+#endif
+        std::cerr
+            << "  - valT::value_type == std::int64_t: "
+            << std::is_same<typename valT::value_type, std::int64_t>::value
+            << std::endl;
+
 #if INTEL_MKL_VERSION >= 20250000
+        std::cerr << "  - API: NEW (passing vector object)" << std::endl;
+        std::cerr.flush(); // Force output to be visible in pytest
         descr_.set_value(mkl_dft::config_param::BWD_STRIDES, strides);
 #else
+        std::cerr << "  - API: OLD (passing data pointer)" << std::endl;
+        std::cerr.flush(); // Force output to be visible in pytest
         descr_.set_value(mkl_dft::config_param::BWD_STRIDES, strides.data());
 #endif // INTEL_MKL_VERSION
     }