Import SQLite 3.10.2.

third_party/sqlite/src/ext/misc/ieee754.c

 /*
 ** 2013-04-17
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
@@ skipping 76 matching lines @@
       m = -m;
       if( m<0 ) return;
     }else if( m==0 && e>1000 && e<1000 ){
       sqlite3_result_double(context, 0.0);
       return;
     }
     while( (m>>32)&0xffe00000 ){
       m >>= 1;
       e++;
     }
-    while( ((m>>32)&0xfff00000)==0 ){
+    while( m!=0 && ((m>>32)&0xfff00000)==0 ){
       m <<= 1;
       e--;
     }
     e += 1075;
     if( e<0 ) e = m = 0;
-    if( e>0x7ff ) m = 0;
+    if( e>0x7ff ) e = 0x7ff;
     a = m & ((((sqlite3_int64)1)<<52)-1);
     a |= e<<52;
-    if( isNeg ) a |= ((sqlite3_int64)1)<<63;
+    if( isNeg ) a |= ((sqlite3_uint64)1)<<63;
     memcpy(&r, &a, sizeof(r));
     sqlite3_result_double(context, r);
   }
 }
 
 
 #ifdef _WIN32
 __declspec(dllexport)
 #endif
 int sqlite3_ieee_init(
   sqlite3 *db, 
   char **pzErrMsg, 
   const sqlite3_api_routines *pApi
 ){
   int rc = SQLITE_OK;
   SQLITE_EXTENSION_INIT2(pApi);
   (void)pzErrMsg;  /* Unused parameter */
   rc = sqlite3_create_function(db, "ieee754", 1, SQLITE_UTF8, 0,
                                ieee754func, 0, 0);
   if( rc==SQLITE_OK ){
     rc = sqlite3_create_function(db, "ieee754", 2, SQLITE_UTF8, 0,
                                  ieee754func, 0, 0);
   }
   return rc;
 }