address review: skip initialization of digit[0]

skirpichev · skirpichev · commit f6ab450aeb39 · 2026-04-01T13:48:10.000+03:00
diff --git a/Include/internal/pycore_long.h b/Include/internal/pycore_long.h
@@ -285,19 +285,12 @@ _PyLong_SameSign(const PyLongObject *a, const PyLongObject *b)
     return (a->long_value.lv_tag & SIGN_MASK) == (b->long_value.lv_tag & SIGN_MASK);
 }
 
-/* Initialize a freshly-allocated int.
- *
- * Fast operations for single digit integers (including zero)
- * assume that there is always at least one digit present.
- * The digit has to be initialized explicitly to avoid
- * use-of-uninitialized-value.
- */
+/* Initialize a freshly-allocated int. */
 static inline void
 _PyLong_InitTag(PyLongObject *op)
 {
     assert(PyLong_Check(op));
     op->long_value.lv_tag = 1; /* non-immortal zero */
-    op->long_value.ob_digit[0] = 0;
 }
 
 #define TAG_FROM_SIGN_AND_SIZE(sign, size) \

Original file line number	Diff line number	Diff line change
`@@ -285,19 +285,12 @@ _PyLong_SameSign(const PyLongObject a, const PyLongObject b)`
`285`	`285`	`return (a->long_value.lv_tag & SIGN_MASK) == (b->long_value.lv_tag & SIGN_MASK);`
`286`	`286`	`}`
`287`	`287`
`288`		`-/* Initialize a freshly-allocated int.`
`289`		`- *`
`290`		`- * Fast operations for single digit integers (including zero)`
`291`		`- * assume that there is always at least one digit present.`
`292`		`- * The digit has to be initialized explicitly to avoid`
`293`		`- * use-of-uninitialized-value.`
`294`		`- */`
	`288`	`+/* Initialize a freshly-allocated int. */`
`295`	`289`	`static inline void`
`296`	`290`	`_PyLong_InitTag(PyLongObject *op)`
`297`	`291`	`{`
`298`	`292`	`assert(PyLong_Check(op));`
`299`	`293`	`op->long_value.lv_tag = 1; /* non-immortal zero */`
`300`		`- op->long_value.ob_digit[0] = 0;`
`301`	`294`	`}`
`302`	`295`
`303`	`296`	`#define TAG_FROM_SIGN_AND_SIZE(sign, size) \`