From 8ac39fa3310ba4a66992ccfce839195c31acf688 Mon Sep 17 00:00:00 2001
From: Cedric Nugteren <web@cedricnugteren.nl>
Date: Sat, 15 Sep 2018 16:53:09 +0200
Subject: Disabled Intel subgroup shuffling for double-precision

---
 src/utilities/compile.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/utilities')

diff --git a/src/utilities/compile.cpp b/src/utilities/compile.cpp
index 835f54b4..00cb90cb 100644
--- a/src/utilities/compile.cpp
+++ b/src/utilities/compile.cpp
@@ -59,7 +59,8 @@ std::shared_ptr<Program> CompileFromSource(
   }
 
   // For Intel GPUs with subgroup support, use subgroup shuffling.
-  if (device.IsGPU() && device.HasExtension(kKhronosIntelSubgroups)) {
+  if (device.IsGPU() && device.HasExtension(kKhronosIntelSubgroups) &&
+      (precision == Precision::kSingle || precision == Precision::kHalf)) {
     header_string += "#define USE_SUBGROUP_SHUFFLING 1\n";
     header_string += "#define SUBGROUP_SHUFFLING_INTEL 1\n";
   }
-- 
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