Support (probably) Intel Compiler in bits.h.
GitOrigin-RevId: 2be57d01753df41cc20b200c562129e7769b3a8e
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@ -25,6 +25,7 @@ inline int32 count_bits32(uint32 x);
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inline int32 count_bits64(uint64 x);
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inline int32 count_bits64(uint64 x);
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#if TD_MSVC
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#if TD_MSVC
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inline int32 count_leading_zeroes32(uint32 x) {
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inline int32 count_leading_zeroes32(uint32 x) {
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unsigned long res = 0;
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unsigned long res = 0;
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if (_BitScanReverse(&res, x)) {
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if (_BitScanReverse(&res, x)) {
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@ -92,7 +93,75 @@ inline int32 count_bits64(uint64 x) {
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return count_bits32(static_cast<uint32>(x >> 32)) + count_bits32(static_cast<uint32>(x));
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return count_bits32(static_cast<uint32>(x >> 32)) + count_bits32(static_cast<uint32>(x));
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#endif
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#endif
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}
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}
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#elif TD_INTEL
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inline int32 count_leading_zeroes32(uint32 x) {
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unsigned __int32 res = 0;
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if (_BitScanReverse(&__int32, x)) {
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return 31 - res;
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}
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return 32;
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}
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inline int32 count_leading_zeroes64(uint64 x) {
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#if defined(_M_X64) || defined(__x86_64__)
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unsigned __int32 res = 0;
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if (_BitScanReverse64(&res, x)) {
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return 63 - res;
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}
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return 64;
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#else
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#else
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if ((x >> 32) == 0) {
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return count_leading_zeroes32(static_cast<uint32>(x)) + 32;
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} else {
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return count_leading_zeroes32(static_cast<uint32>(x >> 32));
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}
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#endif
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}
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inline int32 count_trailing_zeroes32(uint32 x) {
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unsigned __int32 res = 0;
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if (_BitScanForward(&res, x)) {
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return res;
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}
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return 32;
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}
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inline int32 count_trailing_zeroes64(uint64 x) {
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#if defined(_M_X64) || defined(__x86_64__)
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unsigned __int32 res = 0;
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if (_BitScanForward64(&res, x)) {
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return res;
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}
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return 64;
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#else
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if (static_cast<uint32>(x) == 0) {
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return count_trailing_zeroes32(static_cast<uint32>(x >> 32)) + 32;
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} else {
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return count_trailing_zeroes32(static_cast<uint32>(x));
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}
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#endif
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}
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inline uint32 bswap32(uint32 x) {
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return _bswap(static_cast<int>(x));
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}
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inline uint64 bswap64(uint64 x) {
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return _bswap64(static_cast<__int64>(x));
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}
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inline int32 count_bits32(uint32 x) {
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return _popcnt32(static_cast<int>(x));
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}
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inline int32 count_bits64(uint64 x) {
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return _popcnt64(static_cast<__int64>(x));
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}
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#else
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inline int32 count_leading_zeroes32(uint32 x) {
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inline int32 count_leading_zeroes32(uint32 x) {
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if (x == 0) {
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if (x == 0) {
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return 32;
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return 32;
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@ -136,6 +205,7 @@ inline int32 count_bits32(uint32 x) {
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inline int32 count_bits64(uint64 x) {
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inline int32 count_bits64(uint64 x) {
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return __builtin_popcountll(x);
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return __builtin_popcountll(x);
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}
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}
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#endif
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#endif
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//TODO: optimize
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//TODO: optimize
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