Merge pull request #505 from cxd4/jjjjjjjjjjjk

[PJGlide64] imul16: no need for inline asm here

Source/Glide64/FixedPoint.asm.cpp

@@ -41,26 +41,6 @@ typedef signed __int64          int64_t;
 #include <stdint.h>
 #endif
 
-#ifdef _M_IX86
-// (x * y) >> 16
-extern "C" int __declspec(naked) imul16(int x, int y)
-{
-	_asm {
-		push ebp
-		mov ebp,esp
-		mov   eax, [x]
-		mov   edx, [y]
-		imul  edx        
-		shrd  eax,edx,16
-		leave
-		ret
-	}
-}
-
-#else
-DebugBreak();
-#endif
-
 int imul14(int x, int y)
 {
     int64_t result;
@@ -71,6 +51,16 @@ int imul14(int x, int y)
     return (int)(result);
 }
 
+int imul16(int x, int y)
+{
+    int64_t result;
+    const int64_t m = (int64_t)(x);
+    const int64_t n = (int64_t)(y);
+
+    result = (m * n) >> 16;
+    return (int)(result);
+}
+
 int idiv16(int x, int y)
 {
     int64_t result;