Import SQLite 3.10.2.

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

Index: third_party/sqlite/src/ext/misc/ieee754.c
diff --git a/third_party/sqlite/src/ext/misc/ieee754.c b/third_party/sqlite/src/ext/misc/ieee754.c
index f1438938857723b53d32b2ce14ce31c62310efd9..20c5e6143347ca712183145a3ea7f23a4288fc72 100644
--- a/third_party/sqlite/src/ext/misc/ieee754.c
+++ b/third_party/sqlite/src/ext/misc/ieee754.c
@@ -94,16 +94,16 @@ static void ieee754func(
       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);
   }