PyMem_MALLOC (was [Python-Dev] Snake farm) (original) (raw)

Tim Peters tim.one@comcast.net
Sat, 23 Nov 2002 23:20:42 -0500

[Guido]

... But I'd like to see this fixed in configure, not in pymalloc. (Tim seems to favor always ensuring that we never call malloc(0),

Or realloc(0).

but I can't see how that can be done without an extra test+jump. :-( )

Probably can't be, but this is ideal for a conditional-move instruction, and more architectures are growing that. In the meantime, Martin made this change, and I haven't measured a slowdown on my box (it is an extra test-&-branch under MSVC, but the branch is over just one instruction so doesn't (I believe) flush the pipeline).