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#include <winpr/crt.h>
#include <winpr/sysinfo.h>
#include <winpr/windows.h>
#include <winpr/intrin.h>
static BOOL g_LZCNT = FALSE;
static INLINE UINT32 lzcnt_s(UINT32 x)
{
if (!x)
return 32;
if (!g_LZCNT)
{
UINT32 y = 0;
int n = 32;
y = x >> 16;
if (y != 0)
{
n = n - 16;
x = y;
}
y = x >> 8;
if (y != 0)
{
n = n - 8;
x = y;
}
y = x >> 4;
if (y != 0)
{
n = n - 4;
x = y;
}
y = x >> 2;
if (y != 0)
{
n = n - 2;
x = y;
}
y = x >> 1;
if (y != 0)
return n - 2;
return n - x;
}
return __lzcnt(x);
}
static int test_lzcnt(void)
{
if (lzcnt_s(0x1) != 31)
{
fprintf(stderr, "__lzcnt(0x1) != 31: %" PRIu32 "\n", __lzcnt(0x1));
return -1;
}
if (lzcnt_s(0xFF) != 24)
{
fprintf(stderr, "__lzcnt(0xFF) != 24\n");
return -1;
}
if (lzcnt_s(0xFFFF) != 16)
{
fprintf(stderr, "__lzcnt(0xFFFF) != 16\n");
return -1;
}
if (lzcnt_s(0xFFFFFF) != 8)
{
fprintf(stderr, "__lzcnt(0xFFFFFF) != 8\n");
return -1;
}
if (lzcnt_s(0xFFFFFFFF) != 0)
{
fprintf(stderr, "__lzcnt(0xFFFFFFFF) != 0\n");
return -1;
}
return 0;
}
static int test_lzcnt16(void)
{
if (__lzcnt16(0x1) != 15)
{
fprintf(stderr, "__lzcnt16(0x1) != 15\n");
return -1;
}
if (__lzcnt16(0xFF) != 8)
{
fprintf(stderr, "__lzcnt16(0xFF) != 8\n");
return -1;
}
if (__lzcnt16(0xFFFF) != 0)
{
fprintf(stderr, "__lzcnt16(0xFFFF) != 0\n");
return -1;
}
return 0;
}
int TestIntrinsics(int argc, char* argv[])
{
WINPR_UNUSED(argc);
WINPR_UNUSED(argv);
g_LZCNT = IsProcessorFeaturePresentEx(PF_EX_LZCNT);
printf("LZCNT available: %" PRId32 "\n", g_LZCNT);
// test_lzcnt16();
return test_lzcnt();
}
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