Author: Tony Werten
Date: 00:03:03 04/10/03
Go up one level in this thread
On April 10, 2003 at 02:43:22, Uri Blass wrote: >On April 10, 2003 at 02:08:36, Tony Werten wrote: > >>On April 09, 2003 at 11:11:01, Uri Blass wrote: >> >>>Supppose file1 and file2 are numbers between 0 and 7. >>> >>>Am I correct to assume that in general it is better to not to use >>> >>>int A[8]; >>>If (file1<=file2) x+=A[file2-file1]; >> >>Most modern compilers will do better with: >> >>bonus=0; >>if (file1>file2) bonus=A[file2-file1]; >>x+=bonus; > > >Do you say that 3 lines are faster than one line?(I guess you mean file1<=file2 >and not file1<file2 as you wrote in your next message) It should have been file2>file1 > >In any case it is only an example >Practically I have a slightly different condition. > >if (file1+1<file2) >> >>The 2nd line basicly forces the compiler to use a CMOV. > >What does CMOV means? Conditional move, ie a move depending on the outcome of a equation but it's branchless. Its basic idea is like Robert said but then in hardware. Tony > >Uri
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