wamrc SIMD compat check fails on fairly standard hardware

[lucianoiam]

Getting this on 2019 Intel Mac:

Error: SIMD compatibility check failed, try adding --cpu=<cpu> to specify a cpu or adding --disable-simd to disable SIMD

Appending --cpu=skylake fixes it.

Also ./wamrc --cpu=help does not really list the available CPUs.

[lum1n0us]

SIMD compatibility check failed means the local machine doesn't fully achieve WAMR requirements on SIMD, which is at least sse4.1. I am not sure which kind of CPU a 2019 Intel Mac is using but you are able to check it with $cat /proc/cpuinfo

[lucianoiam]

Hi, just checked and this computer's CPU is i7-8569U

According to Intel it supports SSE 4.1 and 4.2

https://www.intel.com/content/www/us/en/products/sku/191050/intel-core-i78569u-processor-8m-cache-up-to-4-70-ghz/specifications.html

[wenyongh]

@lucianoiam What is your complete command to run wamrc? In MacOS, the cpu name will be obtained when target/cpu/cpu-features aren't set, could you please help check whether the following code is executed? https://github.com/bytecodealliance/wasm-micro-runtime/blob/main/core/iwasm/compilation/aot_llvm.c#L1714

[lucianoiam]

The complete command is wamrc --target=x86_64 -o dsp/build/x86_64.aot

Line 1714 is not being called when using the line above, but removing --target causes 1714 to be called and also the issue goes away (ie, no need to append --cpu anymore).

So it seems --target and --cpu must be both present or absent?

[wenyongh]

Yes, no need to add --target if the target is same as host.