M-Labs/nac3
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cannot load kernel: symbol lookup error: rint #61

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opened 2021-10-10 17:45:52 +08:00 by sb10q · 4 comments
sb10q commented 2021-10-10 17:45:52 +08:00
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Current demo does not start (tested on RISC-V KC705):

artiq.coredevice.comm_kernel.LoadError: cannot load kernel: symbol lookup error: rint
Current demo does not start (tested on RISC-V KC705): ``` artiq.coredevice.comm_kernel.LoadError: cannot load kernel: symbol lookup error: rint ```
pca006132 commented 2021-10-10 18:32:21 +08:00
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It requires some libm symbols.

It requires some libm symbols.
sb10q commented 2021-10-10 20:39:24 +08:00
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OK, but why is it using rint()? We are only implementing round() into an integer, whereas rint() is double -> double. Isn't that inefficient? What is the legacy compiler doing?

OK, but why is it using ``rint()``? We are only implementing ``round()`` into an integer, whereas ``rint()`` is ``double -> double``. Isn't that inefficient? What is the legacy compiler doing?
sb10q commented 2021-10-10 20:58:21 +08:00
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Legacy compiler uses llvm.round.f64 (also double->double), NAC3 is using llvm.rint.f64.

Legacy compiler uses ``llvm.round.f64`` (also ``double->double``), NAC3 is using ``llvm.rint.f64``.
sb10q closed this issue 2021-10-11 08:19:05 +08:00
sb10q commented 2021-10-11 08:19:30 +08:00
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rint is not available in the rust libm crate used on Zynq.

rint is not available in the rust libm crate used on Zynq.
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Reference: M-Labs/nac3#61
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