Antoine Pitrou
Fri Dec 14 10:41:41 CET 2012Previous message:
[Python-Dev] cpython: Using 'long double' to force this structure to be worst case aligned is no
Next message:
[Python-Dev] 回复： where is the python "import" implemented
Messages sorted by:
———
Le Fri, 14 Dec 2012 01:14:04 -0800, "Gregory P. Smith" <
> a écrit : > Yes, see the followup. My comments before were all misinterpreting > size_t. >> Same result on x86_64 linux. On a 64-bit platform the 24 byte > structure now occupies 24 bytes instead of being padded to 32. > Nice. On a 32-bit platform it should remain 16 bytes. But you are losing the 16-byte alignment that the union was precisely designed to enforce. > The PyGC_Head union structure is NOT part of the ABI laid out in >
http://www.python.org/dev/peps/pep-0384/
and is accurately excluded > from the .h file when Py_LIMITED_API is defined so changing this in > 3.4 should not be a problem. Not an ABI problem in 3.4 indeed (except that it might break platforms with strict alignment requirements). It should be noted that the GC head isn't part of standard atomic types (int, float, str...), so the memory gain will not be very noticeable IMO. Regards Antoine.
———
Previous message:
[Python-Dev] cpython: Using 'long double' to force this structure to be worst case aligned is no
Next message:
[Python-Dev] 回复： where is the python "import" implemented
Messages sorted by:
———