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make use of count population intrinsincs on MSVC/gcc/clang

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Signed-off-by: Nuno Lopes <a-nlopes@microsoft.com>
This commit is contained in:
Nuno Lopes 2014-09-19 15:51:08 +01:00
parent bb56885147
commit d36cecc2f3
1 changed files with 9 additions and 7 deletions
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16
src/util/util.h
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@ -95,7 +95,12 @@ unsigned uint64_log2(uint64 v);
COMPILE_TIME_ASSERT(sizeof(unsigned) == 4);
// Return the number of 1 bits in v.
inline unsigned get_num_1bits(unsigned v) {
static inline unsigned get_num_1bits(unsigned v) {
#ifdef _MSC_VER
return __popcnt(v);
#elif defined(__GNUC__)
return __builtin_popcount(v);
#else
#ifdef Z3DEBUG
unsigned c;
unsigned v1 = v;
@ -108,15 +113,16 @@ inline unsigned get_num_1bits(unsigned v) {
unsigned r = (((v + (v >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24;
SASSERT(c == r);
return r;
#endif
}
// Remark: on gcc, the operators << and >> do not produce zero when the second argument >= 64.
// So, I'm using the following two definitions to fix the problem
inline uint64 shift_right(uint64 x, uint64 y) {
static inline uint64 shift_right(uint64 x, uint64 y) {
return y < 64ull ? (x >> y) : 0ull;
}
inline uint64 shift_left(uint64 x, uint64 y) {
static inline uint64 shift_left(uint64 x, uint64 y) {
return y < 64ull ? (x << y) : 0ull;
}
@ -255,10 +261,6 @@ inline std::ostream & operator<<(std::ostream & out, std::pair<T1, T2> const & p
return out;
}
#ifndef _WINDOWS
#define __forceinline inline
#endif
template<typename IT>
bool has_duplicates(const IT & begin, const IT & end) {
for (IT it1 = begin; it1 != end; ++it1) {