I know tweaking ISA extensions can change code performance significantly. Vivado allows this to some extent. This assumes the compiler picks up on the extensions and makes the correct adjustments. Again the processor fits the program. There has been many flame wars which miss this point. DSP scales all the way into CISC.
Overall the RISC-V ISA has strengths specific to a control processor. The Cortex-M33 is likely slightly doped to a DSP role but may tie the RISC-V in control workloads. Hazard3 beats Cortex-M0+ in certain cases. Are we looking at a power difference between RISC-V and Cortex-M? Will the SDK actually support AMP software design? The big appeal to AMP is compilers, memory management and networking. It is a simpler but mostly manual workflow. This works great on control but I am not sure about DSP. Delegating certain types of control to lower OSI layers by design is common.
SMP on the other hand allows single cycle performance cores with multi-cycle performance cores. OS manages UMA domains, networking, page file, etc. Programmer selects role and lets OS manage it using specific management/allocation policy. This should play nice with higher OSI layers. However this can lead to more complexity. Proper SMP can always demote to AMP, but AMP may not always be capable of being promoted to SMP.
Overall the RISC-V ISA has strengths specific to a control processor. The Cortex-M33 is likely slightly doped to a DSP role but may tie the RISC-V in control workloads. Hazard3 beats Cortex-M0+ in certain cases. Are we looking at a power difference between RISC-V and Cortex-M? Will the SDK actually support AMP software design? The big appeal to AMP is compilers, memory management and networking. It is a simpler but mostly manual workflow. This works great on control but I am not sure about DSP. Delegating certain types of control to lower OSI layers by design is common.
SMP on the other hand allows single cycle performance cores with multi-cycle performance cores. OS manages UMA domains, networking, page file, etc. Programmer selects role and lets OS manage it using specific management/allocation policy. This should play nice with higher OSI layers. However this can lead to more complexity. Proper SMP can always demote to AMP, but AMP may not always be capable of being promoted to SMP.
Statistics: Posted by dthacher — Tue Aug 20, 2024 3:59 pm