From 3ec458ef4f0d355a6c02825fcea1089f233b4079 Mon Sep 17 00:00:00 2001
From: Gregory Hainaut <gregory.hainaut@gmail.com>
Date: Sat, 30 Jan 2016 16:30:18 +0100
Subject: [PATCH] FPU: sqrt(-0) == 0

It is marked as a special case in the doc (sqrt(-0) == -0)
but test on the PS2 show the contrary. Quite a mistery
---
 pcsx2/FPU.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/pcsx2/FPU.cpp b/pcsx2/FPU.cpp
index 86e96910af..dc823fd532 100644
--- a/pcsx2/FPU.cpp
+++ b/pcsx2/FPU.cpp
@@ -345,12 +345,13 @@ void RSQRT_S() {
 }
 
 void SQRT_S() {
-	if ( ( _FtValUl_ & 0xFF800000 ) == 0x80000000 ) { _FdValUl_ = 0x80000000; } // If Ft = -0
+	if ( ( _FtValUl_ & 0x7F800000 ) == 0 ) // If Ft = +/-0
+		_FdValUl_ = 0;// result is 0
 	else if ( _FtValUl_ & 0x80000000 ) { // If Ft is Negative
 		_ContVal_ |= FPUflagI | FPUflagSI;
 		_FdValf_ = sqrt( fabs( fpuDouble( _FtValUl_ ) ) );
-	}
-	else { _FdValf_ = sqrt( fpuDouble( _FtValUl_ ) ); } // If Ft is Positive
+	} else
+		_FdValf_ = sqrt( fpuDouble( _FtValUl_ ) ); // If Ft is Positive
 	clearFPUFlags( FPUflagD );
 }