Not all You can every write in c/c++. Sometime You need a call for a library function. I think, that can be one and I think, not only TlsAlloc use a zero_bit_scan.
It must be first zero_bit in the first 'bytecount' DWORD from the bitmap addr.
Dietrich
On Thu, 10 Feb 2005 18:59:21 +0100, Dietrich Teickner wrote:
I have a suggestion for a faster implementation of the zero_bit_scan in RtlFindClearBits [NTDLL.@] (rlbitmap.c) for e.g. TlsAlloc() The main is the usage of the instruction 'bsf eax, eax'
This I have implemented in the new experimental odinxp-tree for finding the first zero_bit in the first 'bytecount' bytes of the bitmap addr.
Does this actually make a noticeable difference? Rewriting stuff in assembly for theoretical performance improvements isn't so great, as far fewer people can read/write assembly than C.
thanks -mike
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Dietrich Teickner