From e98a5122d4fa831710775163888ab38a28403968 Mon Sep 17 00:00:00 2001
From: Giulio Eulisse <10544+ktf@users.noreply.github.com>
Date: Fri, 25 Sep 2026 10:32:37 +0200
Subject: [PATCH] GPUTracking: give Metal its own Float16_t at the conversion
 site

Rather than trying to adapt Ort::Float16_t to work on Metal, we
simply alias it to Metal native type, which is bit-to-bit equivalent to the CUDA half
implementation and differs from the software one only in the sign of NaN.
---
 .../TPCClusterFinder/GPUTPCNNClusterizerKernels.cxx   | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/GPU/GPUTracking/TPCClusterFinder/GPUTPCNNClusterizerKernels.cxx b/GPU/GPUTracking/TPCClusterFinder/GPUTPCNNClusterizerKernels.cxx
index 693ee4dd78e8d..902c04e6e92f3 100644
--- a/GPU/GPUTracking/TPCClusterFinder/GPUTPCNNClusterizerKernels.cxx
+++ b/GPU/GPUTracking/TPCClusterFinder/GPUTPCNNClusterizerKernels.cxx
@@ -25,7 +25,18 @@ using namespace o2::gpu::tpccf;
 #include "CfConsts.h"
 #include "CfUtils.h"
 #include "ClusterAccumulator.h"
+#ifdef __METAL__
+namespace o2::OrtDataType
+{
+struct Float16_t {
+  half v;
+  Float16_t() = default;
+  Float16_t(float f) : v(f) {}
+};
+} // namespace o2::OrtDataType
+#else
 #include "ML/3rdparty/GPUORTFloat16.h"
+#endif
 
 #if !defined(GPUCA_GPUCODE)
 #include "GPUHostDataTypes.h"