[Soft-Float] - Fixes Itof/Ftoi accuracy.

[Soft-Float] - Fixes Itof accuracy.

The PS2 FP Unit behave differently if exponent is less than 158, we emulate this now.

Also, forbid denormals in Ftoi.

Expect some AI improvements, if any.

pcsx2/PS2Float.cpp

@@ -468,18 +468,17 @@ PS2Float PS2Float::Itof(s32 complement, s32 f1)
 
 	s32 resExponent;
 
+	bool negative = f1 < 0;
+
 	if (f1 == -2147483648)
 	{
-		// special case
-		resExponent = 158 - complement;
-
-		if (resExponent >= 0)
-			return PS2Float(true, (u8)resExponent, 0);
-
-		return PS2Float(0);
+		if (complement <= 0)
+			// special case
+			return PS2Float(0xcf000000);
+		else
+			f1 = 2147483647;
 	}
 
-	bool negative = f1 < 0;
 	s32 u = std::abs(f1);
 
 	s32 shifts;
@@ -500,7 +499,9 @@ PS2Float PS2Float::Itof(s32 complement, s32 f1)
 
 	resExponent = BIAS + MANTISSA_BITS - shifts - complement;
 
-	if (resExponent >= 0)
+	if (resExponent >= 158)
+		return negative ? PS2Float(0xcf000000) : PS2Float(0x4f000000);
+	else if (resExponent >= 0)
 		return PS2Float(negative, (u8)resExponent, (u32)u);
 
 	return PS2Float(0);
@@ -520,7 +521,7 @@ s32 PS2Float::Ftoi(s32 complement, u32 f1)
 		f1 |= 0x800000;
 		if (complement < 158)
 		{
-			if (complement >= 126)
+			if (complement > 126)
 			{
 				f1 = (f1 << 7) >> (31 - ((u8)complement - 126));
 				if ((s32)a < 0)