Freescale Semiconductor StarCore SC140 - Manual (Page 692)

A-378 SC140 DSP Core Reference Manual
SAT.F
S
SAT.F
Saturate Fractional Data Register
SAT.F
(DALU)
Description
Status and Conditions that Affect Instruction
None.
Status and Conditions Changed by Instruction
Example
sat.f d2,d3
Operation Assembler Syntax
If Da > $007FFFFFFF then $007FFF0000
→ Dn
If Da < $FF80000000 then $FF80000000
→ Dn
Else Da & $FFFFFF0000
→ Dn
SAT.F Da,Dn
SAT.F Da,Dn
If the values of the extension bits [39:32] and bit 31 of the source register are all zeros or all ones (no
overflow), the source register is transferred to the destination register, and the LP is cleared. If the source
register indicates an overflow, the saturated value (positive or negative depending on bit 39) is transferred
to the HP of the destination register, sign-extended, and the LP is cleared. The saturated positive value is
$007FFF0000; the saturated negative value is $FF80000000. This operation is independent of the SM bit in
SR. It is intended for use after an instruction that is not affected by the saturation mode and before a
MOVES instruction.
Register Address Bit Name Description
Ln L Clears the Ln bit in the destination register.
EMR[2] DOVF Set if saturation occurs.
Register/Memory Address Before After
L2:D2 $1:$00 846D 0000
L3:D3 $0:$00 7FFF 0000
EMR $0000 0004