Xilinx MicroBlaze Reference Manual page 170

Chapter 5: MicroBlaze Instruction Set Architecture
bge
Branch if Greater or Equal
bge
bged
1 0 0 1 1 1 D 0 1 0 1
0 6
Description
Branch if rA is greater or equal to 0, to the instruction located in the offset value of rB. The target of
the branch will be the instruction at address PC + rB.
The mnemonic bged will set the D bit. The D bit determines whether there is a branch delay slot or
not. If the D bit is set, it means that there is a delay slot and the instruction following the branch (that
is, in the branch delay slot) is allowed to complete execution before executing the target instruction.
If the D bit is not set, it means that there is no delay slot, so the instruction to be executed after the
branch is the target instruction.
Pseudocode
Registers Altered
•
Latency
•
•
•
Note
A delay slot must not be used by the following: imm, branch, or break instructions. Interrupts and
external hardware breaks are deferred until after the delay slot branch has been completed.
170
Send Feedback
rA, rB
rA, rB
rA
1
1
If rA >= 0 then
←
PC PC + rB
else
←
PC PC + 4
if D = 1 then
allow following instruction to complete execution
PC
1 cycle (if branch is not taken)
2 cycles (if branch is taken and the D bit is set)
3 cycles (if branch is taken and the D bit is not set)
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Branch if Greater or Equal
Branch if Greater or Equal with Delay
rB 0 0 0 0 0 0 0 0 0 0 0
1 2
6 1
MicroBlaze Processor Reference Guide
3
1
UG081 (v14.7)