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reactivate software-based CRC32 on x64 platforms without SSE4.2

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This commit is contained in:
Dennis Luxen 2014-08-12 17:16:41 +02:00
parent ad5cd564ab
commit 82ce9dfc04
1 changed files with 4 additions and 7 deletions
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11
Algorithms/IteratorBasedCRC32.h
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@ -34,9 +34,11 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#if defined(__x86_64__) && !defined(__MINGW64__)
#include <cpuid.h>
#else
#endif
#include <boost/crc.hpp> // for boost::crc_32_type
#if defined(__MINGW64__)
inline void __get_cpuid(int param, unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx)
{
*ecx = 0;
@ -51,17 +53,12 @@ template <class ContainerT> class IteratorbasedCRC32
bool use_SSE42_CRC_function;
#if !defined(__x86_64__)
boost::crc_optimal<32, 0x1EDC6F41, 0x0, 0x0, true, true> CRC32_processor;
#endif
unsigned SoftwareBasedCRC32(char *str, unsigned len)
{
#if !defined(__x86_64__)
CRC32_processor.process_bytes(str, len);
return CRC32_processor.checksum();
#else
return 0;
#endif
}
// adapted from http://byteworm.com/2010/10/13/crc32/