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(MMX): added PSubB, PSubW and PSubD methods.

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morkt 2016-02-09 09:56:51 +04:00
parent c559dbccee
commit 77af4a7f50
1 changed files with 31 additions and 0 deletions
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31
ArcFormats/ArcCommon.cs
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@ -495,6 +495,37 @@ namespace GameRes.Formats
return r | ((x & mask) + (y & mask)) & mask;
}
public static ulong PSubB (ulong x, ulong y)
{
ulong r = 0;
for (ulong mask = 0xFF; mask != 0; mask <<= 8)
{
r |= ((x & mask) - (y & mask)) & mask;
}
return r;
}
public static ulong PSubW (ulong x, ulong y)
{
ulong mask = 0xffff;
ulong r = ((x & mask) - (y & mask)) & mask;
mask <<= 16;
r |= ((x & mask) - (y & mask)) & mask;
mask <<= 16;
r |= ((x & mask) - (y & mask)) & mask;
mask <<= 16;
r |= ((x & mask) - (y & mask)) & mask;
return r;
}
public static ulong PSubD (ulong x, ulong y)
{
ulong mask = 0xffffffff;
ulong r = ((x & mask) - (y & mask)) & mask;
mask <<= 32;
return r | ((x & mask) - (y & mask)) & mask;
}
public static ulong PSllD (ulong x, int count)
{
count &= 0x1F;