From ec5572aa69d5749cba3ad0a5e1b76109851634b7 Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Sat, 26 May 2018 17:08:08 +0200
Subject: [PATCH] [dxbc] Scan for discard and derivative instructions

---
 src/dxbc/dxbc_analysis.cpp | 12 +++++++++++-
 src/dxbc/dxbc_analysis.h   |  3 +++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/dxbc/dxbc_analysis.cpp b/src/dxbc/dxbc_analysis.cpp
index c9c98017..a230da97 100644
--- a/src/dxbc/dxbc_analysis.cpp
+++ b/src/dxbc/dxbc_analysis.cpp
@@ -34,7 +34,17 @@ namespace dxvk {
           m_analysis->uavInfos[registerId].accessAtomicOp = true;
         }
       } break;
-        
+      
+      case DxbcInstClass::TextureSample:
+      case DxbcInstClass::VectorDeriv: {
+        m_analysis->usesDerivatives = true;
+      } break;
+      
+      case DxbcInstClass::ControlFlow: {
+        if (ins.op == DxbcOpcode::Discard)
+          m_analysis->usesKill = true;
+      } break;
+      
       case DxbcInstClass::TypedUavLoad: {
         const uint32_t registerId = ins.src[1].idx[0].offset;
         m_analysis->uavInfos[registerId].accessTypedLoad = true;
diff --git a/src/dxbc/dxbc_analysis.h b/src/dxbc/dxbc_analysis.h
index d51ede59..5059ae84 100644
--- a/src/dxbc/dxbc_analysis.h
+++ b/src/dxbc/dxbc_analysis.h
@@ -37,6 +37,9 @@ namespace dxvk {
     
     DxbcClipCullInfo clipCullIn;
     DxbcClipCullInfo clipCullOut;
+    
+    bool usesDerivatives  = false;
+    bool usesKill         = false;
   };
   
   /**