count-leading-zeros: port to MSC; support types wider than 64 bits

[gnulib.git] / ChangeLog

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 2013-10-06  Paul Eggert  <eggert@cs.ucla.edu>
 
+       count-leading-zeros: port to MSC; support types wider than 64 bits
+       The ideas behind the MSC port are stolen from Emacs.
+       * lib/count-leading-zeros.h:
+       Don't include verify.h: it's no longer needed, as types wider than
+       64 bits are now supported.
+       (COUNT_LEADING_ZEROS): New arg MSC_BUILTIN, for better
+       performance with MSC.  All uses changed.  Do not assume that TYPE
+       has at most 64 bits.
+       (count_leading_zeros_32): Assume 0 < X < 2**32, for speed.
+       All uses changed.  Fold the subtraction from 31 into the table.
+
        count-one-bits: port to MSC; support types wider than 64 bits
        The ideas behind the MSC port are stolen from Emacs.
        * lib/count-one-bits.c (popcount_support) [_MSC_VER]: New variable.