Encoding:

Format:

SHF.df 

SHF.B wd,ws,i8

SHF.H wd,ws,i8

SHF.W wd,ws,i8

Purpose:

Immediate Set Shuffle Elements

Immediate control value-based 4 element set copy

Description:

wd[i] = shuffle_set(ws, i, i8)

The set shuffle instruction works on 4-element sets in df data format. All sets are shuf fled in the same w ay: the element i82i+1..2i in ws is copied over the element i in wd, where i is 0, 1, 2, 3.

The operands and results are values in byte data format.

Restrictions:

No data-dependent exceptions are possible.

Operation:

SHF.B
   for i in 0 .. WRLEN/8-1
      j = i % 4
      k = i - j + i82j+1..2j
      WR[wd]8i+7..8i = WR[ws]8k+7..8k
   endfor
SHF.H
   for i in 0 .. WRLEN/16-1
      j = i % 4
      k = i - j + i82j+1..2j
      WR[wd]16i+15..16i = WR[ws]16k+15..16k
   endfor
SHF.W
   for i in 0 .. WRLEN/32-1
      j = i % 4
      k = i - j + i82j+1..2j
      WR[wd]32i+31..32i = WR[ws]32k+31..32k
   endfor

Exceptions:

Reserved Instruction Exception, MSA Disabled Exception.