Issue #6713: Improve performance of str(n) and repr(n) for integers n
(up to 3.1 times faster in tests), by special-casing base 10 in
_PyLong_Format.
diff --git a/Include/longintrepr.h b/Include/longintrepr.h
index 7765172..3d71a35 100644
--- a/Include/longintrepr.h
+++ b/Include/longintrepr.h
@@ -50,12 +50,16 @@
typedef PY_UINT64_T twodigits;
typedef PY_INT64_T stwodigits; /* signed variant of twodigits */
#define PyLong_SHIFT 30
+#define _PyLong_DECIMAL_SHIFT 9 /* max(e such that 10**e fits in a digit) */
+#define _PyLong_DECIMAL_BASE ((digit)1000000000) /* 10 ** DECIMAL_SHIFT */
#elif PYLONG_BITS_IN_DIGIT == 15
typedef unsigned short digit;
typedef short sdigit; /* signed variant of digit */
typedef unsigned long twodigits;
typedef long stwodigits; /* signed variant of twodigits */
#define PyLong_SHIFT 15
+#define _PyLong_DECIMAL_SHIFT 4 /* max(e such that 10**e fits in a digit) */
+#define _PyLong_DECIMAL_BASE ((digit)10000) /* 10 ** DECIMAL_SHIFT */
#else
#error "PYLONG_BITS_IN_DIGIT should be 15 or 30"
#endif