Thursday, November 10, 2011

BitReverse again

Just to satisfy the high performance fanatics: Below you find the most efficient reverser algorithm I could write so far.Unfortunately getting this code into SQL Server is not as simple as it might look. ODS (the extended stored procedure API) seems to have more overhead than the CLR and CLR interop also generates more overhead than you can save. If anybody has good ideas on how I can get this efficiently in, please give me a ping.

BitReverse PROC
PUSH r13

XOR rax, rax
MOV r13, rcx
MOV rcx, 63
SHR r13,1
RCL rax,1
LOOP JumpLabel
POP r13


BitReverse ENDP