From acc0b0f3138b0ea4d573db5152927026c29bd61d Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Sun, 5 Dec 2021 09:25:05 -0300
Subject: Fix FLO.SH shader instruction with a input of 0 (#2876)

* Fix FLO.SH shader instruction with a input of 0

* Shader cache version bump
---
 Ryujinx.Graphics.Shader/Instructions/InstEmitBitfield.cs | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

(limited to 'Ryujinx.Graphics.Shader/Instructions')

diff --git a/Ryujinx.Graphics.Shader/Instructions/InstEmitBitfield.cs b/Ryujinx.Graphics.Shader/Instructions/InstEmitBitfield.cs
index 7a141bbc..71925269 100644
--- a/Ryujinx.Graphics.Shader/Instructions/InstEmitBitfield.cs
+++ b/Ryujinx.Graphics.Shader/Instructions/InstEmitBitfield.cs
@@ -166,13 +166,17 @@ namespace Ryujinx.Graphics.Shader.Instructions
         {
             Operand srcB = context.BitwiseNot(src, invert);
 
-            Operand res = isSigned
-                ? context.FindFirstSetS32(srcB)
-                : context.FindFirstSetU32(srcB);
+            Operand res;
 
             if (sh)
             {
-                res = context.BitwiseExclusiveOr(res, Const(31));
+                res = context.FindLSB(context.BitfieldReverse(srcB));
+            }
+            else
+            {
+                res = isSigned
+                    ? context.FindMSBS32(srcB)
+                    : context.FindMSBU32(srcB);
             }
 
             context.Copy(GetDest(rd), res);
-- 
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