A83: Rotation instructions

A83: Rotation instructions

• To: assembly-83@lists.ticalc.org
• Subject: A83: Rotation instructions
• From: "Anders Jensen" <a_h_jensen@hotmail.com>
• Date: Fri, 07 Aug 1998 15:27:31 PDT
• Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
• Reply-To: assembly-83@lists.ticalc.org

Here is diagrams of all the shifting/rotation instructions. 
Understanding them should be simple, the instructions simply moves the 
bits in the arrows direction. Bit 0 is the least significant, bit 7 the 
most.

RLC: (Rotate Left Carry)

       ->-->-->-->-->-->-->-
      /                     \
  C<-7<-6<-5<-4<-3<-2<-1<-0<-

RL: (Rotate Left)
  ->-->-->-->-->-->-->-->-
 /                         \
 C<-7<-6<-5<-4<-3<-2<-1<-0<-  

RRC: (Rotate Right Carry)
  -<--<--<--<--<--<--<--
 /                      \
 ->7->6->5->4->3->2->1->0->C

RR: (Rotate Right)
  -<--<--<--<--<--<--<--
 /                      \
 ->7->6->5->4->3->2->1->0->C

SLA: (Shift Left Arithmetic)
 C<-7<-6<-5<-4<-3<-2<-1<-0 (bit 0 gets value 0)

SRA: (Shift Right Arithmetic)
7->6->5->4->3->2->1->0->C (bit 7 stays UNCHANGED)

SRL: (Shift Right Logic)
7->6->5->4->3->2->1->0->C (bit 7 gets value 0)

Hope you can use it.

Anders


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• Re: A83: Rotation instructions
• From: Linus Akesson <lairfight@softhome.net>

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