Update const_PI

Allow a patched best rounded value or the original value from the MS BASIC

tools/generate_constants.cc

@@ -52,6 +52,8 @@ std::vector<ConstEntry> GLOBAL_constants =
 
 	ConstEntry(   "HALF_PI", M_PI / 2.0           ),
 	ConstEntry(        "PI", M_PI                 ),
+	ConstEntry(     "PI_MS", 3.1415926529         ),      // This is the value of PI used in the Microsoft BASIC. It is only the third closest approximation
+
 	ConstEntry( "DOUBLE_PI", M_PI * 2.0           ),
 	ConstEntry(     "SQR_2", std::sqrt(2.0)       ),
 	ConstEntry( "INV_SQR_2", 1.0 / std::sqrt(2.0) ),

tools/similarity.c

@@ -20,9 +20,10 @@ int matches[MAX_SIZE];
 
 int phase_mask[MAX_SIZE+MAX_SIZE];
 
-#define NUM_CHUNKS 13
+#define NUM_CHUNKS 14
 // Pairs of start, end memory addresses of known exact similarity with the open source Microsoft BASIC
 unsigned short microsoft_basic_chunks[NUM_CHUNKS * 2] = {
+    0xAEA8, 0xAEAC,
     0xB248, 0xB24C,
     0xB391, 0xB39D,
     0xB3A2, 0xB3A5,