x64/x86 dynarecs: fast-math fcmp/eq implementation

Fixes Shin Nihon Pro Wrestling - Toukon Retsuden 4
Fixes Project Justice (Issue #38)

core/hw/sh4/sh4_core.h

@@ -131,12 +131,15 @@ static INLINE f32 fixNaN(f32 f)
 {
 #ifdef STRICT_MODE
 	u32& hex = *(u32 *)&f;
+#ifdef __FAST_MATH__
+	// fast-math
+	if ((hex & 0x7fffffff) > 0x7f800000)
+		hex = 0x7fbfffff;
+#else
 	// no fast-math
 	if (f != f)
 		hex = 0x7fbfffff;
-//	// fast-math
-//	if ((hex & 0x7fffffff) > 0x7f800000)
-//		hex = 0x7fbfffff;
+#endif
 #endif
 	return f;
 }
@@ -144,12 +147,16 @@ static INLINE f32 fixNaN(f32 f)
 static INLINE f64 fixNaN64(f64 f)
 {
 #ifdef STRICT_MODE
-	// no fast-math
 	u64& hex = *(u64 *)&f;
+#ifdef __FAST_MATH__
+	// fast-math
+	if ((hex & 0x7fffffffffffffffll) > 0x7ff0000000000000ll)
+		hex = 0x7ff7ffffffffffffll;
+#else
+	// no fast-math
 	if (f != f)
 		hex = 0x7ff7ffffffffffffll;
-	// fast-math
-//	return (*(u64 *)&f & 0x7fffffffffffffffll) <= 0x7f80000000000000ll ? f : 0x7ff7ffffffffffffll;
+#endif
 #endif
 	return f;
 }

core/rec-x64/rec_x64.cpp

@@ -335,6 +335,12 @@ public:
 			}
 			break;
 
+			case shop_jcond:
+			case shop_jdyn:
+			case shop_mov32:
+				genBaseOpcode(op);
+				break;
+
 #ifndef CANONICAL_TEST
 			case shop_sync_sr:
 				GenCall(UpdateSR);

core/rec-x64/xbyak_base.h

@@ -566,11 +566,13 @@ protected:
 			}
 			else
 			{
-				//special case
-				//We want to take in account the 'unordered' case on the fpu
-				lahf();
-				test(ah, 0x44);
-				setnp(al);
+#ifdef __FAST_MATH__
+				sete(al);
+#else
+				mov(edx, 0);
+				setnp(al);	// Parity means unordered (NaN), ZF is set too
+				cmovne(eax, edx);
+#endif
 			}
 			movzx(mapRegister(op.rd), al);
 			break;

core/rec-x86/x86_ops.cpp

@@ -349,6 +349,12 @@ void X86Compiler::genOpcode(RuntimeBlockInfo* block, bool optimise, shil_opcode&
 		}
 		break;
 
+	case shop_jcond:
+	case shop_jdyn:
+	case shop_mov32:
+		genBaseOpcode(op);
+		break;
+
 #ifndef CANONICAL_TEST
 	case shop_sync_sr:
 		genCallCdecl(UpdateSR);