[Apache TVM Discuss] [Questions] DEPT FLAGs and dependency queue

[YuZeng via Apache TVM Discuss <no...@discuss.tvm.ai>]

Hi,

I am trying understand the hardware design of VTA, can anyone help me with the two questions?

1. I saw in the encodings of all instructions, there is a 4-bit field called "DEPT FLAG". I guess it is used to represent the dependency relationship between load/store and compute instructions. But there is no information for how to use the 4-bit FLAG. What be assigned to the FLAG if there are dependency between a LOAD and the following compute instruction?

2. I know there are dependency queues the modules to synchronize load/store and compute operations. What is the corresponding chisel code for the dependency queue in the source code? I did not find them. Thanks!





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[Apache TVM Discuss] [Questions] Question about the DEPT FLAGs in instruction encoding

[YuZeng via Apache TVM Discuss <no...@discuss.tvm.ai>]

I have figured out myself, and I guess this information might be useful for others:

From the generated RTL from chisel, the 4-bit DEPT FLAG actually corresponds to: 

bit3~bit0: push_next, push_prev, pop_next, pop_prev.

So from the instruction encoding we can explicitly specify the dependency between instructions.





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