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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
//
#include "fold.h"
using search::v16qi;
using search::v2di;
namespace vsm {
namespace {
constexpr v16qi G_0 = { '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1, '0'-1 };
constexpr v16qi G_9 = { '9', '9', '9', '9', '9', '9', '9', '9', '9', '9', '9', '9', '9', '9', '9', '9' };
constexpr v16qi G_a = { 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1, 'a'-1 };
constexpr v16qi G_z = { 'z', 'z', 'z', 'z', 'z', 'z', 'z', 'z', 'z', 'z', 'z', 'z', 'z', 'z', 'z', 'z' };
constexpr v16qi G_8bit = { (char)0xc4, (char)0xc4, (char)0xc4, (char)0xc4, (char)0xc4, (char)0xc4, (char)0xc4, (char)0xc4,
(char)0xc4, (char)0xc4, (char)0xc4, (char)0xc4, (char)0xc4, (char)0xc4, (char)0xc4, (char)0xc4 };
constexpr v2di G_lowCase = { 0x2020202020202020ULL, 0x2020202020202020ULL };
}
const unsigned char * sse2_foldaa(const unsigned char * toFoldOrg, size_t sz, unsigned char * foldedOrg)
{
const auto * toFold = reinterpret_cast<const v16qi *>(toFoldOrg);
v2di * folded = reinterpret_cast<v2di *>(foldedOrg);
size_t i=0;
for (size_t m=sz/16; i < m; i++)
{
int nonAscii = __builtin_ia32_pmovmskb128(toFold[i]);
if (nonAscii)
{
v16qi non8Mask = G_8bit > toFold[i];
int non8bit = __builtin_ia32_pmovmskb128(non8Mask);
if (non8bit)
{
break;
}
break;
}
v16qi _0 = toFold[i] > G_0;
v16qi _z = toFold[i] > G_z;
v2di _0_z = v2di(_0) ^ v2di(_z);
v2di toLow = _0_z & v2di(toFold[i]);
auto low = v16qi(toLow | G_lowCase);
_0 = low > G_0;
v16qi _9 = low > G_9;
v16qi _a = low > G_a;
_z = low > G_z;
v2di _0_9_m = v2di(_0) ^ v2di(_9);
v2di _a_z_m = v2di(_a) ^ v2di(_z);
v2di _0_9 = _0_9_m & v2di(low);
v2di _a_z = _a_z_m & v2di(low);
folded[i] = _0_9 | _a_z;
}
return toFoldOrg+i*16;
}
const unsigned char * sse2_foldua(const unsigned char * toFoldOrg, size_t sz, unsigned char * foldedOrg)
{
v2di * folded = reinterpret_cast<v2di *>(foldedOrg);
size_t i=0;
for (size_t m=sz/16; i < m; i++)
{
v16qi current = __builtin_ia32_lddqu(reinterpret_cast<const char *>(&toFoldOrg[i*16]));
int nonAscii = __builtin_ia32_pmovmskb128(current);
if (nonAscii)
{
v16qi non8Mask = G_8bit > current;
int non8bit = __builtin_ia32_pmovmskb128(non8Mask);
if (non8bit)
{
break;
}
break;
}
v16qi _0 = current > G_0;
v16qi _z = current > G_z;
v2di _0_z = v2di(_0) ^ v2di(_z);
v2di toLow = _0_z & v2di(current);
auto low = v16qi(toLow | G_lowCase);
_0 = low > G_0;
v16qi _9 = low > G_9;
v16qi _a = low > G_a;
_z = low > G_z;
v2di _0_9_m = v2di(_0) ^ v2di(_9);
v2di _a_z_m = v2di(_a) ^ v2di(_z);
v2di _0_9 = _0_9_m & v2di(low);
v2di _a_z = _a_z_m & v2di(low);
folded[i] = _0_9 | _a_z;
}
return toFoldOrg+i*16;
}
}
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