Fix for x86 zlib issue

This commit is contained in:
KimLS
2019-06-30 18:28:11 -07:00
parent e086f53b97
commit f50d502f3d
11 changed files with 3275 additions and 2 deletions
+25
View File
@@ -0,0 +1,25 @@
#ifndef X86_CTZL_H
#define X86_CTZL_H
#include <intrin.h>
#ifdef X86_CPUID
# include "x86.h"
#endif
#if defined(_MSC_VER) && !defined(__clang__)
/* This is not a general purpose replacement for __builtin_ctzl. The function expects that value is != 0
* Because of that assumption trailing_zero is not initialized and the return value of _BitScanForward is not checked
*/
static __forceinline unsigned long __builtin_ctzl(unsigned long value)
{
#ifdef X86_CPUID
if (x86_cpu_has_tzcnt)
return _tzcnt_u32(value);
#endif
unsigned long trailing_zero;
_BitScanForward(&trailing_zero, value);
return trailing_zero;
}
#endif
#endif