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Support (probably) Intel Compiler in bits.h.

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GitOrigin-RevId: 2be57d01753df41cc20b200c562129e7769b3a8e
This commit is contained in:
levlam 2018-12-20 03:30:44 +03:00
parent e2d1a71d3b
commit 5a56da186f
1 changed files with 70 additions and 0 deletions
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70
tdutils/td/utils/bits.h
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@ -25,6 +25,7 @@ inline int32 count_bits32(uint32 x);
inline int32 count_bits64(uint64 x);
#if TD_MSVC
inline int32 count_leading_zeroes32(uint32 x) {
unsigned long res = 0;
if (_BitScanReverse(&res, x)) {
@ -92,7 +93,75 @@ inline int32 count_bits64(uint64 x) {
return count_bits32(static_cast<uint32>(x >> 32)) + count_bits32(static_cast<uint32>(x));
#endif
}
#elif TD_INTEL
inline int32 count_leading_zeroes32(uint32 x) {
unsigned __int32 res = 0;
if (_BitScanReverse(&__int32, x)) {
return 31 - res;
}
return 32;
}
inline int32 count_leading_zeroes64(uint64 x) {
#if defined(_M_X64) || defined(__x86_64__)
unsigned __int32 res = 0;
if (_BitScanReverse64(&res, x)) {
return 63 - res;
}
return 64;
#else
if ((x >> 32) == 0) {
return count_leading_zeroes32(static_cast<uint32>(x)) + 32;
} else {
return count_leading_zeroes32(static_cast<uint32>(x >> 32));
}
#endif
}
inline int32 count_trailing_zeroes32(uint32 x) {
unsigned __int32 res = 0;
if (_BitScanForward(&res, x)) {
return res;
}
return 32;
}
inline int32 count_trailing_zeroes64(uint64 x) {
#if defined(_M_X64) || defined(__x86_64__)
unsigned __int32 res = 0;
if (_BitScanForward64(&res, x)) {
return res;
}
return 64;
#else
if (static_cast<uint32>(x) == 0) {
return count_trailing_zeroes32(static_cast<uint32>(x >> 32)) + 32;
} else {
return count_trailing_zeroes32(static_cast<uint32>(x));
}
#endif
}
inline uint32 bswap32(uint32 x) {
return _bswap(static_cast<int>(x));
}
inline uint64 bswap64(uint64 x) {
return _bswap64(static_cast<__int64>(x));
}
inline int32 count_bits32(uint32 x) {
return _popcnt32(static_cast<int>(x));
}
inline int32 count_bits64(uint64 x) {
return _popcnt64(static_cast<__int64>(x));
}
#else
inline int32 count_leading_zeroes32(uint32 x) {
if (x == 0) {
return 32;
@ -136,6 +205,7 @@ inline int32 count_bits32(uint32 x) {
inline int32 count_bits64(uint64 x) {
return __builtin_popcountll(x);
}
#endif
//TODO: optimize