## SHL = Shift Left

Hex | Mnemonic | Cycles
--- | --- | ---
CE 84 | SHL A | 12
CE 85 | SHL B | 12
CE 86 nn | SHL [N+#nn] | 20
CE 87 | SHL [HL] | 16

### Execute

    A       = Register A
    B       = Register B
    [N+#nn] = Memory: (I shl 16) or (N shl 8) or #nn
    [HL]    = Memory: (I shl 16) or HL

    ; SHL Ds
    ;
    ; Ds = Source/Destination

    Ds = Ds SHL 1

### Description

"8-Bits Destination" bits are shifted left by 1.

NOTE: This instruction can be used as an unsigned integer multiplication by 2.

### Conditions

Zero: Set when result is 0

Carry: Set when the old bit 7 was 1

Sign: Set when bit 7 of the result is 1

Overflow remain unchanged

### Examples

    ; A = 0x04 (4)
    SHL A
    ; A = 0x08 (8)
    ; F = (Zero=0):(Carry=0):(Sign=0)

    ; B = 0x45 (69)
    SHL B
    ; B = 0x8A (138)
    ; F = (Zero=0):(Carry=0):(Sign=1)

    ; B = 0x84 (138)
    SHL B
    ; B = 0x14 (20)
    ; F = (Zero=0):(Carry=1):(Sign=0)

    ; [HL] = 0x80 (128)
    SHL [HL]
    ; [HL] = 0x00 (0)
    ; F = (Zero=1):(Carry=1):(Sign=0)

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