From 0f4c44c9fb642fca7f41a0b6fc1b14bed989328b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pedro=20J=2E=20Est=C3=A9banez?= <pedrojrulez@gmail.com>
Date: Sat, 23 Jan 2021 05:53:10 +0100
Subject: [PATCH] Fix freeze-crash in lightmapper under MinGW-GCC

---
 thirdparty/embree/common/sys/intrinsics.h     | 16 +-------------
 thirdparty/embree/common/sys/mutex.h          | 22 ++-----------------
 thirdparty/embree/common/sys/platform.h       |  2 +-
 .../common/tasking/taskschedulerinternal.cpp  |  8 -------
 4 files changed, 4 insertions(+), 44 deletions(-)

diff --git a/thirdparty/embree/common/sys/intrinsics.h b/thirdparty/embree/common/sys/intrinsics.h
index 1e0fd25eabd..dc8e7145008 100644
--- a/thirdparty/embree/common/sys/intrinsics.h
+++ b/thirdparty/embree/common/sys/intrinsics.h
@@ -11,12 +11,6 @@
 
 #include <immintrin.h>
 
-// -- GODOT start --
-#if defined(__WIN32__) && defined(__MINGW32__)
-#include <unistd.h>
-#endif
-// -- GODOT end --
-
 #if defined(__BMI__) && defined(__GNUC__) && !defined(__INTEL_COMPILER)
   #if !defined(_tzcnt_u32)
     #define _tzcnt_u32 __tzcnt_u32
@@ -425,16 +419,8 @@ namespace embree
   
   __forceinline void pause_cpu(const size_t N = 8)
   {
-// -- GODOT start --
     for (size_t i=0; i<N; i++)
-#if !(defined(__WIN32__) && defined(__MINGW32__))
-// -- GODOT end --
-      _mm_pause();    
-// -- GODOT start --
-#else
-      __builtin_ia32_pause();
-#endif
-// -- GODOT end --
+      _mm_pause();
   }
   
   /* prefetches */
diff --git a/thirdparty/embree/common/sys/mutex.h b/thirdparty/embree/common/sys/mutex.h
index cbd9f95697d..e10ab19acf4 100644
--- a/thirdparty/embree/common/sys/mutex.h
+++ b/thirdparty/embree/common/sys/mutex.h
@@ -47,17 +47,8 @@ namespace embree
       {
         while (flag.load()) 
         {
-// -- GODOT start --
-#if !(defined (__WIN32__) && defined (__MINGW32__))
-// -- GODOT end --
-          _mm_pause(); 
           _mm_pause();
-// -- GODOT start --
-#else
-          __builtin_ia32_pause();
-          __builtin_ia32_pause();
-#endif
-// -- GODOT end --
+          _mm_pause();
         }
         
         bool expected = false;
@@ -83,17 +74,8 @@ namespace embree
     {
       while(flag.load())
       {
-// -- GODOT start --
-#if !(defined (__WIN32__) && defined(__MINGW32__))
-// -- GODOT end --
-        _mm_pause(); 
         _mm_pause();
-// -- GODOT start --
-#else
-        __builtin_ia32_pause();
-        __builtin_ia32_pause();
-#endif
-// -- GODOT end --
+        _mm_pause();
       }
     }
 
diff --git a/thirdparty/embree/common/sys/platform.h b/thirdparty/embree/common/sys/platform.h
index 08617452f48..61a622a6b49 100644
--- a/thirdparty/embree/common/sys/platform.h
+++ b/thirdparty/embree/common/sys/platform.h
@@ -91,7 +91,7 @@
 #define dll_import 
 #endif
 
-#ifdef __WIN32__
+#if defined(__WIN32__) && !defined(__MINGW32__)
 #if !defined(__noinline)
 #define __noinline             __declspec(noinline)
 #endif
diff --git a/thirdparty/embree/common/tasking/taskschedulerinternal.cpp b/thirdparty/embree/common/tasking/taskschedulerinternal.cpp
index 456baf87442..2152e92f446 100644
--- a/thirdparty/embree/common/tasking/taskschedulerinternal.cpp
+++ b/thirdparty/embree/common/tasking/taskschedulerinternal.cpp
@@ -361,15 +361,7 @@ namespace embree
           if ((loopIndex % LOOP_YIELD_THRESHOLD) == 0)
             yield();
           else
-// -- GODOT start --
-#if !defined(__MINGW32__)
-// -- GODOT end --
             _mm_pause();
-// -- GODOT start --
-#else
-            __builtin_ia32_pause();
-#endif
-// -- GODOT end --
 	  loopIndex++;
 #else
           yield();