From 4ad78fdb808c671f7af7ccd98465a96497b66134 Mon Sep 17 00:00:00 2001
From: Ari Vuollet <ari.vuollet@kapsi.fi>
Date: Sun, 3 Sep 2023 17:56:18 +0300
Subject: [PATCH] Use SIMD-instructions in half-precision floats with AVX
 instruction set

---
 Source/Engine/Core/Math/Half.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/Source/Engine/Core/Math/Half.h b/Source/Engine/Core/Math/Half.h
index 634c31ab8..842ec2bde 100644
--- a/Source/Engine/Core/Math/Half.h
+++ b/Source/Engine/Core/Math/Half.h
@@ -6,13 +6,23 @@
 #include "Vector2.h"
 #include "Vector3.h"
 
+#if PLATFORM_SIMD_AVX
+// MSVC generates slower code without AVX
+#define USE_SSE_HALF_CONVERSION 1
+#else
+#define USE_SSE_HALF_CONVERSION 0
+#endif
+
+#if USE_SSE_HALF_CONVERSION
+#include <intrin.h>
+#include <emmintrin.h>
+#endif
+
 /// <summary>
 /// Half-precision 16 bit floating point number consisting of a sign bit, a 5 bit biased exponent, and a 10 bit mantissa
 /// </summary>
 typedef uint16 Half;
 
-#define USE_SSE_HALF_CONVERSION 0
-
 /// <summary>
 /// Utility for packing/unpacking floating point value from single precision (32 bit) to half precision (16 bit).
 /// </summary>