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[MCA] Add an experimental MicroOpQueue stage.
Audit RequiredrL357248

Description

[MCA] Add an experimental MicroOpQueue stage.

This patch adds an experimental stage named MicroOpQueueStage.
MicroOpQueueStage can be used to simulate a hardware micro-op queue (basically,
a decoupling queue between 'decode' and 'dispatch'). Users can specify a queue
size, as well as a optional MaxIPC (which - in the absence of a "Decoders" stage

  • can be used to simulate a different throughput from the decoders).

This stage is added to the default pipeline between the EntryStage and the
DispatchStage only if PipelineOption::MicroOpQueue is different than zero. By
default, llvm-mca sets PipelineOption::MicroOpQueue to the value of hidden flag
-micro-op-queue-size.

Throughput from the decoder can be simulated via another hidden flag named
-decoder-throughput. That flag allows us to quickly experiment with different
frontend throughputs. For targets that declare a loop buffer, flag
-decoder-throughput allows users to do multiple runs, each time simulating a
different throughput from the decoders.

This stage can/will be extended in future. For example, we could add a "buffer
full" event to notify bottlenecks caused by backpressure. flag
-decoder-throughput would probably go away if in future we delegate to another
stage (DecoderStage?) the simulation of a (potentially variable) throughput from
the decoders. For now, flag -decoder-throughput is "good enough" to run some
simple experiments.

Differential Revision: https://reviews.llvm.org/D59928

Details

Auditors
grosbach
Committed
adibiagioMar 29 2019, 5:15 AM
Differential Revision
D59928: [MCA] Add an experimental MicroOpQueue stage.
Parents
rL357247: AMDGPU: Make sram-ecc off by default for Vega20
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