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Copy pathPEXT_PDEP_Emu.cpp
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PEXT_PDEP_Emu.cpp
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#include "stdafx.h"
#include "PEXT_PDEP_Emu.h"
//Credit: Zach Wegner
//Based on https://github.com/zwegner/zp7 project with unrolling and sparse case handling
#if defined (__AVX2__)
using namespace std;
unsigned int pext32_emu(unsigned int v, unsigned int m) {
unsigned int ret = 0, pc = __popcnt(m);
switch (pc) {
case 0:
ret = 0;
break;
case 1:
ret = (v & m) != 0;
break;
case 2: {
unsigned int msb = _bextr_u32(v, (31 - _lzcnt_u32(m)), 1);
unsigned int lsb = _bextr_u32(v, _tzcnt_u32(m), 1);
ret = (msb << 1) | lsb;
}
break;
case 3: {
const unsigned int lz = 31 - _lzcnt_u32(m);
const unsigned int tz = _tzcnt_u32(m);
unsigned int msb = _bextr_u32(v, lz, 1);
unsigned int lsb = _bextr_u32(v, tz, 1);
m = _blsr_u32(m);
unsigned int csb = _bextr_u32(v, _tzcnt_u32(m), 1);
ret = (msb << 2) | (csb << 1) | lsb;
}
break;
case 4: {
const unsigned int lz = 31 - _lzcnt_u32(m);
const unsigned int tz = _tzcnt_u32(m);
unsigned int msb1 = _bextr_u32(v, lz, 1);
unsigned int lsb1 = _bextr_u32(v, tz, 1);
m &= ~((1 << lz) | (1 << tz));
unsigned int msb0 = _bextr_u32(v, 31 - _lzcnt_u32(m), 1);
unsigned int lsb0 = _bextr_u32(v, _tzcnt_u32(m), 1);
ret = (msb1 << 3) | (msb0 << 2) | (lsb0 << 1) | lsb1;
break;
}
//case 5:
//case 6: {
// unsigned int lsb = 0, msb = 0;
// do {
// const unsigned int lz = 31 - _lzcnt_u32(m);
// const unsigned int tz = _tzcnt_u32(m);
// lsb = _rotr(lsb | _bextr_u32(v, tz, 0x1), 1);
// msb = ((msb << 1) | _bextr_u32(v, lz, 0x1));
// m &= ~((1 << lz) | (1 << tz));
// } while (m);
// ret = _rotl((lsb << (pc & 1)) | msb, (pc >> 1));
// } break;
default: {
__m128i mm = _mm_cvtsi32_si128(~m);
__m128i mtwo = _mm_set1_epi64x((~0ULL) - 1);
__m128i clmul = _mm_clmulepi64_si128(mm, mtwo, 0);
unsigned int bit0 = _mm_cvtsi128_si32(clmul);
unsigned int a = v & m;
a = (~bit0 & a) | ((bit0 & a) >> 1);
mm = _mm_and_si128(mm, clmul);
clmul = _mm_clmulepi64_si128(mm, mtwo, 0);
unsigned int bit1 = _mm_cvtsi128_si32(clmul);
a = (~bit1 & a) | ((bit1 & a) >> 2);
mm = _mm_and_si128(mm, clmul);
clmul = _mm_clmulepi64_si128(mm, mtwo, 0);
unsigned int bit2 = _mm_cvtsi128_si32(clmul);
a = (~bit2 & a) | ((bit2 & a) >> 4);
mm = _mm_and_si128(mm, clmul);
clmul = _mm_clmulepi64_si128(mm, mtwo, 0);
unsigned int bit3 = _mm_cvtsi128_si32(clmul);
a = (~bit3 & a) | ((bit3 & a) >> 8);
mm = _mm_and_si128(mm, clmul);
clmul = _mm_sub_epi64(_mm_setzero_si128(), mm);
unsigned int bit4 = _mm_cvtsi128_si32(clmul);
bit4 += bit4;
ret = (unsigned int)((~bit4 & a) | ((bit4 & a) >> 16));
break;
}
}
return ret;
};
unsigned int pdep32_emu(unsigned int v, unsigned int m) {
unsigned int ret = 0, pc = __popcnt(m);
switch (pc) {
case 0:
ret = 0;
break;
case 1:
ret = (v & 1) << _tzcnt_u32(m);
break;
case 2:
ret = (((v << (32 - pc)) & 0x80000000) >> _lzcnt_u32(m)) | ((v & 1) << _tzcnt_u32(m));
break;
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
case 10:
case 11:
case 12:
case 13: {
unsigned int lsb = 0, msb = 0;
unsigned int v1 = v << (32 - pc);
for (unsigned int i = 0; i < pc / 2 ; i++) {
const unsigned int tz = _tzcnt_u32(m);
const unsigned int lz = _lzcnt_u32(m);
m &= ~((0x80000000 >> lz) | (1 << tz));
msb = (v1 & 0x80000000) >> lz;
lsb = (v & 1) << tz;
ret |= (msb | lsb);
v >>= 1;
v1 <<= 1;
}
ret |= ((pc & 1) & v) << _tzcnt_u32(m);
break;
}
default: {
__m128i mtwo = _mm_set1_epi64x((~0ULL) - 1);
__m128i mm = _mm_cvtsi32_si128(~m);
__m128i bit0 = _mm_clmulepi64_si128(mm, mtwo, 0);
mm = _mm_and_si128(mm, bit0);
__m128i bit1 = _mm_clmulepi64_si128(mm, mtwo, 0);
mm = _mm_and_si128(mm, bit1);
__m128i bit2 = _mm_clmulepi64_si128(mm, mtwo, 0);
mm = _mm_and_si128(mm, bit2);
__m128i bit3 = _mm_clmulepi64_si128(mm, mtwo, 0);
mm = _mm_and_si128(mm, bit3);
__m128i bit4 = _mm_sub_epi64(_mm_setzero_si128(), mm);
bit4 = _mm_add_epi64(bit4, bit4);
__m128i a = _mm_cvtsi32_si128(_bzhi_u32(v, pc));
bit4 = _mm_srli_epi64(bit4, 16);
a = _mm_add_epi64(_mm_andnot_si128(bit4, a),_mm_slli_epi64(_mm_and_si128(bit4, a), 16));
bit3 = _mm_srli_epi64(bit3, 8);
a = _mm_add_epi64(_mm_andnot_si128(bit3, a),_mm_slli_epi64(_mm_and_si128(bit3, a), 8));
bit2 = _mm_srli_epi64(bit2, 4);
a = _mm_add_epi64(_mm_andnot_si128(bit2, a),_mm_slli_epi64(_mm_and_si128(bit2, a), 4));
bit1 = _mm_srli_epi64(bit1, 2);
a = _mm_add_epi64(_mm_andnot_si128(bit1, a),_mm_slli_epi64(_mm_and_si128(bit1, a), 2));
bit0 = _mm_srli_epi64(bit0, 1);
a = _mm_add_epi64(_mm_andnot_si128(bit0, a),_mm_slli_epi64(_mm_and_si128(bit0, a), 1));
ret = _mm_cvtsi128_si32(a);
}
break;
}
return ret;
};
#if defined (_M_X64)
unsigned __int64 pext64_emu(unsigned __int64 v, unsigned __int64 m) {
unsigned __int64 ret = 0;
unsigned int pc = (unsigned int)__popcnt64(m);
switch (pc) {
case 0:
ret = 0;
break;
case 1:
ret = (v & m) != 0;
break;
case 2: {
unsigned __int64 msb = _bextr_u64(v, (unsigned int)(63 - _lzcnt_u64(m)), 1);
unsigned __int64 lsb = _bextr_u64(v, (unsigned int)_tzcnt_u64(m), 1);
ret = (msb << 1) | lsb;
}
break;
case 3: {
unsigned __int64 msb = _bextr_u64(v, (unsigned int)(63 - _lzcnt_u64(m)), 1);
unsigned __int64 lsb = _bextr_u64(v, (unsigned int)_tzcnt_u64(m), 1);
m = _blsr_u64(m);
unsigned __int64 csb = _bextr_u64(v, (unsigned int)_tzcnt_u64(m), 1);
ret = (msb << 2) | (csb << 1) | lsb;
}
break;
case 4: {
const unsigned int lz1 = (unsigned int)(63 - _lzcnt_u64(m));
const unsigned int tz1 = (unsigned int)_tzcnt_u64(m);
m &= ~((1ULL << lz1) | (1ULL << tz1));
unsigned __int64 msb1 = _bextr_u64(v, lz1, 1);
unsigned __int64 lsb1 = _bextr_u64(v, tz1, 1);
ret = (msb1 << 3) | lsb1;
unsigned __int64 msb0 = _bextr_u64(v, (unsigned int)(63 - _lzcnt_u64(m)), 1);
unsigned __int64 lsb0 = _bextr_u64(v, (unsigned int)_tzcnt_u64(m), 1);
ret |= (msb0 << 2) | (lsb0 << 1);
break;
}
case 5: {
const unsigned int lz1 = (unsigned int)(63 - _lzcnt_u64(m));
const unsigned int tz1 = (unsigned int)_tzcnt_u64(m);
m &= ~((1ULL << lz1) | (1ULL << tz1));
unsigned __int64 msb1 = _bextr_u64(v, lz1, 1);
unsigned __int64 lsb1 = _bextr_u64(v, tz1, 1);
const unsigned int lz0 = (unsigned int)(63 - _lzcnt_u64(m));
const unsigned int tz0 = (unsigned int)_tzcnt_u64(m);
m &= ~((1ULL << lz0) | (1ULL << tz0));
ret = (msb1 << 4) | lsb1;
unsigned __int64 msb0 = _bextr_u64(v, lz0, 1);
unsigned __int64 lsb0 = _bextr_u64(v, tz0, 1);
ret |= (msb0 << 3) | (lsb0 << 1);
unsigned __int64 csb = _bextr_u64(v, (unsigned int)_tzcnt_u64(m), 1);
ret |= csb << 2;
break;
}
case 6: {
const unsigned int lz2 = (unsigned int)(63 - _lzcnt_u64(m));
const unsigned int tz2 = (unsigned int)_tzcnt_u64(m);
unsigned __int64 msb2 = _bextr_u64(v, lz2, 1);
unsigned __int64 lsb2 = _bextr_u64(v, tz2, 1);
m &= ~((1ULL << lz2) | (1ULL << tz2));
const unsigned int lz1 = (unsigned int)(63 - _lzcnt_u64(m));
const unsigned int tz1 = (unsigned int)_tzcnt_u64(m);
ret = (msb2 << 5) | lsb2;
unsigned __int64 msb1 = _bextr_u64(v, lz1, 1);
unsigned __int64 lsb1 = _bextr_u64(v, tz1, 1);
m &= ~((1ULL << lz1) | (1ULL << tz1));
ret |= (msb1 << 4) | (lsb1 << 1);
unsigned __int64 msb0 = _bextr_u64(v, (unsigned int)(63 - _lzcnt_u64(m)), 1);
unsigned __int64 lsb0 = _bextr_u64(v, (unsigned int)_tzcnt_u64(m), 1);
ret |= (msb0 << 3) | (lsb0 << 2);
break;
}
case 7: {
const unsigned int lz2 = (unsigned int)(63 - _lzcnt_u64(m));
const unsigned int tz2 = (unsigned int)_tzcnt_u64(m);
unsigned __int64 msb2 = _bextr_u64(v, lz2, 1);
unsigned __int64 lsb2 = _bextr_u64(v, tz2, 1);
m &= ~((1ULL << lz2) | (1ULL << tz2));
const unsigned int lz1 = (unsigned int)(63 - _lzcnt_u64(m));
const unsigned int tz1 = (unsigned int)_tzcnt_u64(m);
ret = (msb2 << 6) | lsb2;
unsigned __int64 msb1 = _bextr_u64(v, lz1, 1);
unsigned __int64 lsb1 = _bextr_u64(v, tz1, 1);
m &= ~((1ULL << lz1) | (1ULL << tz1));
const unsigned int lz0 = (unsigned int)(63 - _lzcnt_u64(m));
const unsigned int tz0 = (unsigned int)_tzcnt_u64(m);
ret |= (msb1 << 5) | (lsb1 << 1);
unsigned __int64 msb0 = _bextr_u64(v, lz0, 1);
unsigned __int64 lsb0 = _bextr_u64(v, tz0, 1);
m &= ~((1ULL << lz0) | (1ULL << tz0));
ret |= (msb0 << 4) | (lsb0 << 2);
unsigned __int64 csb = _bextr_u64(v, (unsigned int)_tzcnt_u64(m), 1);
ret |= csb << 3;
break;
}
//case 5:
//case 6: {
// unsigned __int64 lsb = 0, msb = 0;
// do {
// const unsigned int lz = (unsigned int)(63 - _lzcnt_u64(m));
// const unsigned int tz = (unsigned int)_tzcnt_u64(m);
// lsb = _rotr64(lsb | _bextr_u64(v, tz, 0x1), 1);
// msb = ((msb << 1) | _bextr_u64(v, lz, 0x1));
// m &= ~((1ULL << lz) | (1ULL << tz));
// } while (m);
// ret = _rotl64((lsb << (pc & 1)) | msb, (pc >> 1));
// } break;
default: {
__m128i mm = _mm_cvtsi64_si128(~m);
__m128i mtwo = _mm_set1_epi64x((~0ULL) - 1);
__m128i clmul = _mm_clmulepi64_si128(mm, mtwo, 0);
unsigned __int64 bit0 = _mm_cvtsi128_si64(clmul);
unsigned __int64 a = v & m;
a = (~bit0 & a) | ((bit0 & a) >> 1);
mm = _mm_and_si128(mm, clmul);
clmul = _mm_clmulepi64_si128(mm, mtwo, 0);
unsigned __int64 bit1 = _mm_cvtsi128_si64(clmul);
a = (~bit1 & a) | ((bit1 & a) >> 2);
mm = _mm_and_si128(mm, clmul);
clmul = _mm_clmulepi64_si128(mm, mtwo, 0);
unsigned __int64 bit2 = _mm_cvtsi128_si64(clmul);
a = (~bit2 & a) | ((bit2 & a) >> 4);
mm = _mm_and_si128(mm, clmul);
clmul = _mm_clmulepi64_si128(mm, mtwo, 0);
unsigned __int64 bit3 = _mm_cvtsi128_si64(clmul);
a = (~bit3 & a) | ((bit3 & a) >> 8);
mm = _mm_and_si128(mm, clmul);
clmul = _mm_clmulepi64_si128(mm, mtwo, 0);
unsigned __int64 bit4 = _mm_cvtsi128_si64(clmul);
a = (~bit4 & a) | ((bit4 & a) >> 16);
mm = _mm_and_si128(mm, clmul);
clmul = _mm_sub_epi64(_mm_setzero_si128(), mm);
unsigned __int64 bit5 = _mm_cvtsi128_si64(clmul);
bit5 += bit5;
ret = (~bit5 & a) | ((bit5 & a) >> 32);
} break;
}
return ret;
};
unsigned __int64 pdep64_emu(unsigned __int64 v, unsigned __int64 m) {
unsigned int pc =(unsigned int)__popcnt64(m);
unsigned __int64 ret = 0;
switch (pc) {
case 0:
ret = 0;
break;
case 1:
ret = (v & 1) << _tzcnt_u64(m);
break;
case 2:
ret = (((v << (64 - pc)) & 0x8000000000000000) >> _lzcnt_u64(m)) | ((v & 1) << _tzcnt_u64(m));
break;
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
case 10:
case 11:
case 12:
case 13:
case 14:
case 15: {
unsigned __int64 lsb = 0, msb = 0;
unsigned __int64 v1 = v << (64 - pc);
for (unsigned int i = 0; i < pc / 2; i++) {
const unsigned __int64 tz = _tzcnt_u64(m);
const unsigned __int64 lz = _lzcnt_u64(m);
m &= ~((0x8000000000000000 >> lz) | (1ULL << tz));
msb = (v1 & 0x8000000000000000) >> lz;
lsb = (v & 1) << tz;
ret |= (msb | lsb);
v >>= 1;
v1 <<= 1;
}
ret |= ((pc & 1) & v) << _tzcnt_u64(m);
} break;
default: {
__m128i mtwo = _mm_set1_epi64x((~0ULL) - 1);
__m128i mm = _mm_cvtsi64_si128(~m);
__m128i bit0 = _mm_clmulepi64_si128(mm, mtwo, 0);
mm = _mm_and_si128(mm, bit0);
__m128i bit1 = _mm_clmulepi64_si128(mm, mtwo, 0);
mm = _mm_and_si128(mm, bit1);
__m128i bit2 = _mm_clmulepi64_si128(mm, mtwo, 0);
mm = _mm_and_si128(mm, bit2);
__m128i bit3 = _mm_clmulepi64_si128(mm, mtwo, 0);
mm = _mm_and_si128(mm, bit3);
__m128i bit4 = _mm_clmulepi64_si128(mm, mtwo, 0);
mm = _mm_and_si128(mm, bit4);
__m128i bit5 = _mm_sub_epi64(_mm_setzero_si128(), mm);
bit5 = _mm_add_epi64(bit5, bit5);
__m128i a = _mm_cvtsi64_si128(_bzhi_u64(v, pc));
bit5 = _mm_srli_epi64(bit5, 32);
a = _mm_add_epi64(_mm_andnot_si128(bit5, a),_mm_slli_epi64(_mm_and_si128(bit5, a), 32));
bit4 = _mm_srli_epi64(bit4, 16);
a = _mm_add_epi64(_mm_andnot_si128(bit4, a),_mm_slli_epi64(_mm_and_si128(bit4, a), 16));
bit3 = _mm_srli_epi64(bit3, 8);
a = _mm_add_epi64(_mm_andnot_si128(bit3, a),_mm_slli_epi64(_mm_and_si128(bit3, a), 8));
bit2 = _mm_srli_epi64(bit2, 4);
a = _mm_add_epi64(_mm_andnot_si128(bit2, a),_mm_slli_epi64(_mm_and_si128(bit2, a), 4));
bit1 = _mm_srli_epi64(bit1, 2);
a = _mm_add_epi64(_mm_andnot_si128(bit1, a),_mm_slli_epi64(_mm_and_si128(bit1, a), 2));
bit0 = _mm_srli_epi64(bit0, 1);
a = _mm_add_epi64(_mm_andnot_si128(bit0, a),_mm_slli_epi64(_mm_and_si128(bit0, a), 1));
ret = _mm_cvtsi128_si64(a);
}
break;
}
return ret;
};
#endif
void PEXT_PDEP_Emu_Test() {
cout << "-----------------------------------" << endl;
for (int b = 0; b <= 32; b++) {
unsigned int x = (((1UL) << b) + ((1UL << 31) >> b)) | (1UL << 16);
unsigned int y = _bzhi_u32(~0, b);
printf("%03d x:0x%08x orig:0x%08x emu:0x%08x | y:0x%08x orig:0x%08x emu:0x%08x\r\n", b, x, _pext_u32(~0, x), pext32_emu(~0, x), y, _pext_u32(~0, y), pext32_emu(~0, y));
assert(_pext_u32(~0, x) == pext32_emu(~0, x));
assert(_pext_u32(~0, y) == pext32_emu(~0, y));
}
cout << "-----------------------------------" << endl;
for (int b = 0; b <= 32; b++) {
unsigned int x = (((1UL) << b) + ((1UL << 31) >> b)) | (1UL << 16);
unsigned int y = _bzhi_u32(~0, b);
printf("%03d x:0x%08x orig:0x%08x emu:0x%08x | y:0x%08x orig:0x%08x emu:0x%08x\r\n", b, x, _pdep_u32(~0, x), pdep32_emu(~0, x), y, _pdep_u32(~0, y), pdep32_emu(~0, y));
assert(_pdep_u32(~0, x) == pdep32_emu(~0, x));
assert(_pdep_u32(~0, y) == pdep32_emu(~0, y));
}
#if defined (_M_X64)
cout << "-----------------------------------" << endl;
for (int b = 0; b <= 64; b++) {
unsigned __int64 x = (((1ULL) << b) + ((1ULL << 63) >> b)) | (1ULL << 32) | (1ULL << 32) | (1ULL << 16) | (1ULL << 48);
unsigned __int64 y = _bzhi_u64(~0, b);
printf("%03d x:0x%016I64x orig:0x%016I64x emu:0x%016I64x | x:0x%016I64x orig:0x%016I64x emu:0x%016I64x\r\n", b, x, _pext_u64(~0, x), pext64_emu(~0, x), y, _pext_u64(~0, y), pext64_emu(~0, y));
assert(_pext_u64(~0, x) == pext64_emu(~0, x));
assert(_pext_u64(~0, y) == pext64_emu(~0, y));
}
cout << "-----------------------------------" << endl;
for (int b = 0; b <= 64; b++) {
unsigned __int64 x = (((1ULL) << b) + ((1ULL << 63) >> b)) | (1ULL << 32) | (1ULL << 16) | (1ULL << 48);
unsigned __int64 y = _bzhi_u64(~0, b);
printf("%03d x:0x%016I64x orig:0x%016I64x emu:0x%016I64x | x:0x%016I64x orig:0x%016I64x emu:0x%016I64x\r\n", b, x, _pdep_u64(~0, x), pdep64_emu(~0, x), y, _pdep_u64(~0, y), pdep64_emu(~0, y));
assert(_pdep_u64(~0, x) == pdep64_emu(~0, x));
assert(_pdep_u64(~0, y) == pdep64_emu(~0, y));
}
#endif
}
#endif