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[3.7] Revert "align PyGC_Head to alignof(long double) (GH-13335)" (GH-13569) 

This reverts commit ea2b76bdc5.
See the bug for discussion.

https://bugs.python.org/issue27987
This commit is contained in:
Gregory P. Smith 2019-05-25 10:05:01 -07:00 committed by GitHub
parent ea2b76bdc5
commit 2156fec1f7
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2 changed files with 1 additions and 7 deletions
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6
Include/objimpl.h
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@ -255,11 +255,7 @@ typedef union _gc_head {
union _gc_head *gc_prev; union _gc_head *gc_prev;
Py_ssize_t gc_refs; Py_ssize_t gc_refs;
} gc; } gc;
long double dummy; /* force worst-case alignment */ double dummy; /* force worst-case alignment */
// malloc returns memory block aligned for any built-in types and
// long double is the largest standard C type.
// On amd64 linux, long double requires 16 byte alignment.
// See bpo-27987 for more discussion.
} PyGC_Head; } PyGC_Head;
extern PyGC_Head *_PyGC_generation0; extern PyGC_Head *_PyGC_generation0;

2
Misc/NEWS.d/next/Core and Builtins/2019-05-15-18-28-43.bpo-27987.FaxuLy.rst
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@ -1,2 +0,0 @@
``PyGC_Head`` structure is aligned to ``long double``. This is needed to
GC-ed objects are aligned properly. Patch by Inada Naoki.