Slot delay
A model for Air Traffic Flow Management (ATFM) slot allocation is proposed. • At the first level model minimizes propagated delay by utilizing schedule buffers. Understanding stalls and branch delay slots. In a delayed branch, the hardware always executes (does not cancel) the delay slot instructions after the branch. Definition of delay slot in the ROSESLILLY.INFO dictionary. Meaning of delay slot. What does delay slot mean? Information and translations of delay slot in the most.
Air traffic flow management
This inevitably requires that newer hardware implementations contain extra hardware to ensure that the architectural behavior is followed despite no longer being relevant. For instance time-critical flights carrying human organs for organ transplantation. This is what the design 1 does by stalling for two cycles which is equivalent to fetching two no-ops that are not part of the actual program. The example gives the percentage of branches and the percentages of branches that are taken and not taken. Load delays were seen on very early RISC processor designs. For the not taken path, one no-op is executed, wasting one cycle.
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Delay slot
The instruction following the branch is executed before the branch takes effect. The position immediately following any branch or call instruction is called the "delay slot", and the instruction in that position is the "delay instruction".
Some useful instruction that should be executed whether you branch or not. Some instruction that does useful work only when you branch or when you don't branch , but doesn't do any harm if executed in the other case.
When all else fails, a NOP instruction. Anything that sets the CC that the branch decision depends on. The branch instruction makes the decision on whether to branch or not right away but it doesn't actually do the branch until after the delay instruction. Only the branch is delayed, not the decision. What happens if you do this is not even defined! The result is unpredictable!

This is really two instructions, not one, and only half of it will be in the delay slot. The assembler will warn you about this. Increment the counter ba Loop! Back to the Loop again nop! The delay slot should not be done that way. Increment the counter delay slot Example 2: Loop until they are equal nop!
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Details
Design 1 An obvious way to handle the delayed availability of the address of the instruction after the branch is simply to wait. This is what the design 1 does by stalling for two cycles which is equivalent to fetching two no-ops that are not part of the actual program.

This means that for both taken and not taken paths two cycles will wasted, just as if two no-op instructions had been inserted by the compiler. Here are diagrams of the pipeline ST is a stall, NO is a no-op, XX is a canceled instruction, UU is a useless instruction, I1, I2, and I3 are the three instructions before the branch [in the original program order before filling any delay slots], BI is the branch instruction, I5, I6, and I7 are the fall-through instructions after the branch, I21, I22, and I23 are the instructions at the start of the taken path; IF is the instruction fetch stage, DE is decode, BR is branch resolve, S1 is the stage after BR: This is predicting all branches as not taken.
If the branch is taken, then the two instructions fetched after the branch are canceled effectively turned into no-ops. This is the design 2: In a delayed branch, the hardware always executes does not cancel the delay slot instructions after the branch two instructions in the example. By always executing the delay slot instructions, the pipeline simplified. The compiler's job is to try to fill these delay slots with useful instructions.

Instructions taken from before the branch in the program without delayed branches will be useful regardless of which path is taken but dependencies can prevent the compiler from scheduling any such instructions after the branch. The compiler can fill a delay slot with an instruction from the taken or not taken path, but such an instruction cannot be one that overwrites state used by the other path or after the paths join since delay slot instructions are not canceled unlike with prediction.
If both paths join--as is common for if-then-else constructs--, then delay slots could potentially be filled from the join point; but such instructions are usually dependent on instructions from at least one of the paths before the join, which dependency would prevent them from being used in delay slots.
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