On 7/25/09 7:11 AM, Neil Hodgson wrote:
Martin v. Löwis:
I propose to add another (regular) double into the union.
Adding a regular double as a second dummy gives the same sizes and
alignments with Mingw or MSVC as the original definition with MSVC:
Great (checked that, too)
This makes pretty much sense, also given that this waste
happens under Windows, already.
In regard to alignment penalties, a simple copy loop for doubles
runs about 20% slower when misaligned on an my AMD processor. Other
x86 processors can be much worse. As much as 2 to 3.25 times according
to
I am still unhappy with this waste of memory, just because the
GC header has to be rounded up, regardlwss wether that is needed
or not.
We should keep Martin's hint in mind, that Python 4 could place
the gc header at the end of structures, instead.
cheers - chris
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