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