From fa185693d23d538d250104f276d26385e0e105cb Mon Sep 17 00:00:00 2001
From: Magnus Norddahl <dpjudas@users.noreply.github.com>
Date: Thu, 29 Nov 2018 00:17:40 +0100
Subject: [PATCH] - _mm_rcp_ps may be faster but its precision is too poor

---
 src/polyrenderer/drawers/screen_triangle.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/polyrenderer/drawers/screen_triangle.cpp b/src/polyrenderer/drawers/screen_triangle.cpp
index 1323da270..52b9cc1a2 100644
--- a/src/polyrenderer/drawers/screen_triangle.cpp
+++ b/src/polyrenderer/drawers/screen_triangle.cpp
@@ -528,7 +528,7 @@ void StepSpan(int y, int x0, int x1, const TriDrawTriangleArgs *args, PolyTriang
 
 	for (int x = x0; x < x1; x += 4)
 	{
-		__m128 rcp_posW = _mm_rcp_ps(mposW);
+		__m128 rcp_posW = _mm_div_ps(_mm_set1_ps(1.0f), mposW); // precision of _mm_rcp_ps(mposW) is terrible!
 
 		if (OptT::Flags & SWOPT_DynLights)
 		{