From 9f38177e1b8b5fdf49cc2cdd6eb0ef45e51d057c Mon Sep 17 00:00:00 2001
From: Tom Deakin <tom.deakin@bristol.ac.uk>
Date: Mon, 17 May 2021 15:32:42 +0100
Subject: [PATCH] [SYCL 2020] Add check for FP64 support using device aspects.

This will resolve #98 in the future SYCL 2020 version.
---
 SYCLStream.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/SYCLStream.cpp b/SYCLStream.cpp
index b4fa514..9e23175 100644
--- a/SYCLStream.cpp
+++ b/SYCLStream.cpp
@@ -34,6 +34,15 @@ SYCLStream<T>::SYCLStream(const int ARRAY_SIZE, const int device_index)
   std::cout << "Using SYCL device " << getDeviceName(device_index) << std::endl;
   std::cout << "Driver: " << getDeviceDriver(device_index) << std::endl;
 
+  // Check device can support FP64 if needed
+  if (sizeof(T) == sizeof(double))
+  {
+    if (!dev.has(sycl::aspect::fp64))
+    {
+      throw std::runtime_error("Device does not support double precision, please use --float");
+    }
+  }
+
   queue = std::make_unique<sycl::queue>(dev, sycl::async_handler{[&](sycl::exception_list l)
   {
     bool error = false;