Changes between Version 2 and Version 3 of IDISA_Horizontal


Ignore:
Timestamp:
May 6, 2011, 7:05:06 PM (8 years ago)
Author:
cameron
Comment:

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  • IDISA_Horizontal

    v2 v3  
    2323|| `packl` || pack low || r,,i,, = c,,2i+1,, ||
    2424|| `packh` || pack high || r,,i,, = c,,2i,, ||
    25 || `packus` || pack with signed saturation || r,,i,, = ss(c,,2i+1,,) ||
    26 || `packss` || pack with unsigned saturation || r,,i,, = us(c,,2i+1,,) ||
     25|| `packus` || pack with unsigned saturation || r,,i,, = us,,N,,(concat(c,,2i,,, c,,2i+1,,)||
     26|| `packss` || pack with signed saturation || r,,i,, = ss,,N,,(concat(c,,2i,,, c,,2i+1,,) ||
     27
     28where the N-bit unsigned and signed saturation functions are defined as follows.
     29 - us,,N,,(x) = x, if u(x) < 2^N^
     30 - us,,N,,(x) = 2^N^-1, if u(x) >= 2^N^
     31 - ss,,N,,(x) = x, if -2^N-1^ <= s(x) < 2^N-1^
     32 - ss,,N,,(x) = 2^N-1^-1, if s(x) >= 2^N-1^
     33 - ss,,N,,(x) = -2^N-1^, if s(x) < 2^N-1^
    2734
    2835In these definitions, fields are numbered left-to-right in so-called *big-endian*