Workaround for Intel CPU OpenCL 2025.3 (#5137)

platforms/opencl/src/OpenCLFFT3D.cpp

@@ -59,6 +59,8 @@ OpenCLFFT3D::OpenCLFFT3D(OpenCLContext& context, int xsize, int ysize, int zsize
     if (platformVendor.size() >= 5 && platformVendor.substr(0, 5) == "Intel") {
         // Intel's OpenCL uses low accuracy trig functions, so tell VkFFT to use lookup tables instead.
         config.useLUT = 1;
+        // Version 2025.3 of Intel's OpenCL generates incorrect results when Y and Z sizes are 33 or 39; this is a workaround.
+        config.fixMinRaderPrimeMult = 11;
     }
     VkFFTResult result = initializeVkFFT(&app, config);
     if (result != VKFFT_SUCCESS)

platforms/opencl/tests/TestOpenCLFFT.cpp

@@ -122,6 +122,9 @@ int main(int argc, char* argv[]) {
             testTransform<mm_double2>(true, 25, 28, 25);
             testTransform<mm_double2>(true, 25, 25, 28);
             testTransform<mm_double2>(true, 21, 25, 27);
+            testTransform<mm_double2>(true, 32, 33, 33);
+            testTransform<mm_double2>(true, 32, 33, 39);
+            testTransform<mm_double2>(true, 32, 39, 39);
         }
         else {
             testTransform<mm_float2>(false, 28, 25, 30);
@@ -129,6 +132,9 @@ int main(int argc, char* argv[]) {
             testTransform<mm_float2>(true, 25, 28, 25);
             testTransform<mm_float2>(true, 25, 25, 28);
             testTransform<mm_float2>(true, 21, 25, 27);
+            testTransform<mm_float2>(true, 32, 33, 33);
+            testTransform<mm_float2>(true, 32, 33, 39);
+            testTransform<mm_float2>(true, 32, 39, 39);
         }
     }
     catch(const exception& e) {