Encoding:

Format:

ASUB_S.df 

ASUB_S.B wd,ws,wt

ASUB_S.H wd,ws,wt

ASUB_S.W wd,ws,wt

ASUB_S.D wd,ws,wt

Purpose:

Vector Absolute Values of Signed Subtract

Vector subtraction from vector of signed values taking the absolute value of the results.

Description:

wd[i] = absolute_value(signed(ws[i]) - signed(wt[i]))

The signed elements in v ector wt are subtracted from the signed elements in v ector ws. The absolute value of the signed result is written to vector wd.

The operands and results are values in integer data format df.

Restrictions:

No data-dependent exceptions are possible.

Operation:

ASUB_S.B:
   for i in 0 .. WRLEN/8-1
      WR[wd]8i+7..8i = asub_s(WR[ws]8i+7..8i, WR[wt]8i+7..8i, 8)
   endfor
ASUB_S.H:
   for i in 0 .. WRLEN/16-1
      WR[wd]16i+15..16i = asub_s(WR[ws]16i+15..16i, WR[wt]16i+15..16i, 16)
   endfor
ASUB_S.W:
   for i in 0 .. WRLEN/32-1
      WR[wd]32i+31..32i = asub_s(WR[ws]32i+31..32i, WR[wt]32i+31..32i, 32)
   endfor
ASUB_S.D:
   for i in 0 .. WRLEN/64-1
      WR[wd]64i+63..64i = asub_s(WR[ws]64i+63..64i, WR[wt]64i+63..64i, 64)
   endfor
function asub_s(ts, tt, n)
   t = (tsn-1 || ts) - (ttn-1 || tt)
   if tn = 0 then
      return tn-1..0
   else
      return (-t)n-1..0
endfunction asub_s

Exceptions:

Reserved Instruction Exception, MSA Disabled Exception.