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misc: add clz wrapper for builtin

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* spot/bricks/brick-bitlevel, spot/misc/Makefile.am,
spot/misc/bitset.hh, spot/misc/clz.cc,
spot/misc/clz.hh, spot/misc/fixpool.hh: here.
This commit is contained in:
Etienne Renault 2018-07-13 09:15:38 +00:00
parent 01cceef29a
commit 69457e957b
6 changed files with 158 additions and 8 deletions
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7
spot/bricks/brick-bitlevel
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@ -37,6 +37,7 @@
#include <atomic>
#include <cstring>
#include <spot/misc/clz.hh>
#ifndef BRICK_BITLEVEL_H
#define BRICK_BITLEVEL_H
@ -182,19 +183,19 @@ static inline unsigned MSB( T x ) {
template<>
inline unsigned MSB< unsigned int >( unsigned int x ) {
static const unsigned long bits = sizeof( unsigned int ) * 8 - 1;
return bits - __builtin_clz( x );
return bits - spot::clz( x );
}
template<>
inline unsigned MSB< unsigned long >( unsigned long x ) {
static const unsigned bits = sizeof( unsigned long ) * 8 - 1;
return bits - __builtin_clzl( x );
return bits - spot::clz( x );
}
template<>
inline unsigned MSB< unsigned long long >( unsigned long long x ) {
static const unsigned bits = sizeof( unsigned long long ) * 8 - 1;
return bits - __builtin_clzll( x );
return bits - spot::clz( x );
}
// gets only Most Significant Bit