From 3c3d939e8fc73e049de12b682319545935bc8def Mon Sep 17 00:00:00 2001
From: David Rohr <drohr@jwdt.org>
Date: Wed, 18 Jun 2025 22:35:59 +0200
Subject: [PATCH] Hide NaN code with -ffast-math

---
 Common/ML/include/ML/3rdparty/GPUORTFloat16.h | 2 ++
 GPU/Common/GPUCommonMath.h                    | 7 ++-----
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/Common/ML/include/ML/3rdparty/GPUORTFloat16.h b/Common/ML/include/ML/3rdparty/GPUORTFloat16.h
index 3bf2f465b2a35..75e146d872cd1 100644
--- a/Common/ML/include/ML/3rdparty/GPUORTFloat16.h
+++ b/Common/ML/include/ML/3rdparty/GPUORTFloat16.h
@@ -568,9 +568,11 @@ GPUdi() uint16_t BFloat16Impl<Derived>::ToUint16Impl(float v) noexcept
 template <class Derived>
 GPUdi() float BFloat16Impl<Derived>::ToFloatImpl() const noexcept
 {
+#ifndef __FAST_MATH__
   if (IsNaN()) {
     return o2::gpu::CAMath::QuietNaN();
   }
+#endif
   float result;
   char* const first = reinterpret_cast<char*>(&result);
   char* const second = first + sizeof(uint16_t);
diff --git a/GPU/Common/GPUCommonMath.h b/GPU/Common/GPUCommonMath.h
index b448a30107dad..372e067b14aff 100644
--- a/GPU/Common/GPUCommonMath.h
+++ b/GPU/Common/GPUCommonMath.h
@@ -99,12 +99,9 @@ class GPUCommonMath
   GPUhdi() static float Remainderf(float x, float y);
   GPUd() constexpr static bool Finite(float x);
   GPUd() constexpr static bool IsNaN(float x);
-#pragma GCC diagnostic push
-#if defined(__FAST_MATH__) && defined(__clang__)
-#pragma GCC diagnostic ignored "-Wnan-infinity-disabled"
-#endif
+#ifndef __FAST_MATH__
   GPUd() constexpr static float QuietNaN() { return GPUCA_CHOICE(std::numeric_limits<float>::quiet_NaN(), __builtin_nanf(""), nan(0u)); }
-#pragma GCC diagnostic pop
+#endif
   GPUd() constexpr static uint32_t Clz(uint32_t val);
   GPUd() constexpr static uint32_t Popcount(uint32_t val);