New libc malloc patch
dfr at nlsystems.com
Mon Dec 12 02:17:44 PST 2005
On Monday 12 December 2005 03:16, Johan Bucht wrote:
> Isn't 8 byte alignment expected by some applications?
> How do you know if a allocation is huge if you don't have a tag?
> Something more to read up on i guess. =)
Actually, I'm glad you pointed that out. My own applications use SSE2
primitives a lot and those guys need to be allocated on 16-byte
boundaries. I currently use phkmalloc which has the nice property that
small allocations are aligned to the next greater power-of-2 boundary
which is (for me) always at least 16.
Since you are targetting modern architectures with this allocator, could
you please set the minimum alignment on all i386 and amd64 processors
to 16. For what its worth, when gcc is using SSE instructions, it
assumes this for all memory, stack or malloc.
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