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Copyright 1991 David Jurgens |
SHLD/SHRD - Double Precision Shift (386+ only)
Usage: SHLD dest,src,count
SHRD dest,src,count
Modifies flags: CF PF SF ZF (OF,AF undefined)
SHLD shifts "dest" to the left "count" times and the bit positions
opened are filled with the most significant bits of "src". SHRD
shifts "dest" to the right "count" times and the bit positions
opened are filled with the least significant bits of the second
operand. Only the 5 lower bits of "count" are used.
Clocks Size
Operands 808x 286 386 486 Bytes
reg16,reg16,immed8 - - 3 2 4
reg32,reg32,immed8 - - 3 2 4
mem16,reg16,immed8 - - 7 3 6
mem32,reg32,immed8 - - 7 3 6
reg16,reg16,CL - - 3 3 3
reg32,reg32,CL - - 3 3 3
mem16,reg16,CL - - 7 4 5
mem32,reg32,CL - - 7 4 5
- see Instruction Timing
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shld |
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