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Posted to discuss-archive@tvm.apache.org by Pratik Fegade via Apache TVM Discuss <no...@discuss.tvm.ai> on 2020/09/07 23:36:49 UTC

[Apache TVM Discuss] [Application] LLVM target triple for Graviton2 CPUs


I am using TVM on the AWS ARM machines and am wondering the correct target triple is for them (I have been using -mcpu=cortex-a76 -mattr=+neon). Specifically the Graviton CPUs use the 64-bit ARM Neoverse N1 cores. Thanks!





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[Apache TVM Discuss] [Application] LLVM target triple for Graviton2 CPUs

Posted by Giuseppe Rossini via Apache TVM Discuss <no...@discuss.tvm.ai>.


Hello @pratikfegade,

This is what I always use (which also enables the dot-product support. If you don't want it, just remove the `+dotprod`):

`"llvm -device=arm_cpu -mtriple=aarch64-linux-gnu -mattr=+neon,+v8.2a,+dotprod"` 

A good source for me was [this tutorial](https://tvm.apache.org/docs/tutorials/get_started/cross_compilation_and_rpc.html#declare-and-cross-compile-kernel-on-local-machine).

Hope this helps





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[Apache TVM Discuss] [Application] LLVM target triple for Graviton2 CPUs

Posted by "Cody H. Yu via Apache TVM Discuss" <no...@discuss.tvm.ai>.


This is the one we used on EC2 m6g:

`llvm -device=arm_cpu -mtriple=aarch64-linux-gnu -mattr=+v8.2a,+fullfp16,+fp-armv8,+dotprod,+crc,+crypto,+neon`





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[Apache TVM Discuss] [Application] LLVM target triple for Graviton2 CPUs

Posted by Junru Shao via Apache TVM Discuss <no...@discuss.tvm.ai>.


Hmmm it should just follow the LLVM’s convention





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[Apache TVM Discuss] [Application] LLVM target triple for Graviton2 CPUs

Posted by Ramana Radhakrishnan via Apache TVM Discuss <no...@discuss.tvm.ai>.


  -mcpu=neoverse-n1 should be fine depending on the version of llvm . I can't remember if you need anything in the -mattr to specifically allow for the dot product or fp16 . 

@giuseros has probably some experience here 

Ramana





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[Apache TVM Discuss] [Application] LLVM target triple for Graviton2 CPUs

Posted by Pratik Fegade via Apache TVM Discuss <no...@discuss.tvm.ai>.


Thanks all for the suggestions. I'll try these.





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