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--- a/Include/objimpl.h
+++ b/Include/objimpl.h
@@ -250,7 +250,7 @@
union _gc_head *gc_prev;
Py_ssize_t gc_refs;
} gc;
- double dummy; /* force worst-case alignment */
+ long double dummy; /* force worst-case alignment */
} PyGC_Head;
extern PyGC_Head *_PyGC_generation0;
--- a/Objects/obmalloc.c
+++ b/Objects/obmalloc.c
@@ -643,8 +643,8 @@
*
* You shouldn't change this unless you know what you are doing.
*/
-#define ALIGNMENT 8 /* must be 2^N */
-#define ALIGNMENT_SHIFT 3
+#define ALIGNMENT 16 /* must be 2^N */
+#define ALIGNMENT_SHIFT 4
/* Return the number of bytes in size class I, as a uint. */
#define INDEX2SIZE(I) (((uint)(I) + 1) << ALIGNMENT_SHIFT)
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