Analog Devices ADSP-2106x SHARC User Manual page 678

Errata and Corrections
In this case, the delayed branch instruction ; is executed
R0=R0+R1
but the instruction is not executed. Also, the control
R1=R1+R2
jumps to instead of , with the delayed branch instruction
my foo
being the execution of .
foo
The exception is for JUMP, which can be done for mutually-exclu-
sive conditions for both (EQ, NE). If the first EQ condition works,
then the NE conditional jump has no meaning; it is as good as a
NOP. Code for these exceptions is shown below:
if eq jump label1 (db);
if ne jump label2 (db);
nop;
nop;
• Pushes or Pops of the PC stack
Push of the PC stack in the delayed branch is followed by a . If
pop
a value is pushed in the delayed branch of call, it is popped first in
the called subroutine, which is followed by return to subroutine
RTS.
For example:
20119 call foo (db);
2011A push PCSTK;
2011B nop;
2011C foo;
: second push due to
PCSTK 2011B PCSTK
: first push due to call
2011C
This demonstrates that when the user pushes the during a
PCSTK
delayed slot, the PC stack pointer is pushed onto the .
PCSTK
H-2
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