From 2c3a4fef266db30d9dbfaeb21fff86f7bd1f269e Mon Sep 17 00:00:00 2001
From: Tony Wasserka <4840017+neobrain@users.noreply.github.com>
Date: Tue, 12 Aug 2025 15:33:36 +0200
Subject: [PATCH] HostFeatures: Fix insufficient documentation to reproduce
 3DNow! bug

This ensures we don't forget about it if bug diagnosis leads nowhere.
---
 Source/Common/HostFeatures.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Source/Common/HostFeatures.cpp b/Source/Common/HostFeatures.cpp
index 1812a22ea..8384f6e34 100644
--- a/Source/Common/HostFeatures.cpp
+++ b/Source/Common/HostFeatures.cpp
@@ -499,8 +499,9 @@ FEXCore::HostFeatures FetchHostFeatures(FEX::CPUFeatures& Features, bool Support
   HostFeatures.SupportsAVX = true;
 
 #ifdef _WIN32
-  // Disable 3DNow! by default to better match the set of extensions exposed on modern CPUs
-  // Works around a bug breaking some uses of 3DNow in WOW64 FEX
+  // Disable 3DNow! by default to better match the set of extensions exposed on modern CPUs.
+  // This works around a bug that manifests in some games using native d3dx9 DLLs (most easily reproduced in WoW64 builds).
+  // For example, Fallout: New Vegas and some old EA games will run with a blackscreen.
   HostFeatures.Supports3DNow = false;
 #else
   HostFeatures.Supports3DNow = true;