From 59d4e8a36ab640fa765b4919d37bf2a0cc112af6 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Mon, 30 Sep 2019 00:19:47 +0200
Subject: [PATCH] [dxbc] Fix NaN handling in not-equal comparison

Ne and Dne are unordered in DXBC. Avoid FUnordNotEqual to
avoid potential issues with drivers and debugging tools.
---
 src/dxbc/dxbc_compiler.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/dxbc/dxbc_compiler.cpp b/src/dxbc/dxbc_compiler.cpp
index 18870906c..34397d342 100644
--- a/src/dxbc/dxbc_compiler.cpp
+++ b/src/dxbc/dxbc_compiler.cpp
@@ -1892,8 +1892,9 @@ namespace dxvk {
       
       case DxbcOpcode::Ne:
       case DxbcOpcode::DNe:
-        condition = m_module.opFOrdNotEqual(
-          conditionType, src.at(0).id, src.at(1).id);
+        // Avoid poorly supported FUnordNotEqual
+        condition = m_module.opLogicalNot(conditionType,
+          m_module.opFOrdEqual(conditionType, src.at(0).id, src.at(1).id));
         break;
       
       case DxbcOpcode::IEq: