STINNER Victor <vstin...@redhat.com> added the comment:
> It seems to me that we don't need to have the PyObject structure containing a > Python float to be 16-byte aligned. If so, could we introduce a new obmalloc > API that returns memory with 8-byte alignment, for use by objects that know > they don't require 16-byte alignment? floatobject.c could use this API to > avoid the 33% overhead. PyMem_Malloc / PyObject_Malloc only have one parameter: "size". It knows nothing about the allocated structure. bpo-18835 discussed the idea of adding a new API which accept an alignment parameter. The issue was closed because of the lack of concrete usage. In the clang crash bpo-36618 (which decided us to fix this issue), C alignof() function was discussed: https://bugs.python.org/issue36618#msg340279 Copy of serge-sans-paille's comment: "@vstinner: once you have a portable version of alignof, you can deciding to *not* use the pool allocator if the required alignment is greater than 8B, or you could modify the pool allocator to take alignment information as an extra parameter?" ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue27987> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
