Add AArch64 SVE2 Vector Length Agnostic builders #317
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The first 2 commits of this are #311. Please review only the last commit here. @maxim-kuvyrkov please confirm that this is exactly what was requested. |
asb
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Nov 20, 2024
DavidSpickett
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I've also confirmed that at least right now, these configurations are green. They will be silent to begin with anyway, so that we can work out any capacity issues. |
maxim-kuvyrkov
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Nov 21, 2024
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This looks good to me overall. just one minor nit inline. |
omjavaid
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Nov 29, 2024
These generate code that uses the SVE2 extension, as opposed to our existing builders that only use SVE. Therefore they will run on our Graviton 4 workers only, which are Neoverse v2 cores with SVE and SVE2. The optimisation guide: https://github.com/aws/aws-graviton-getting-started/blob/main/c-c++.md Suggests -mcpu=neoverse-v2 for best performance, but here I'm using it just so we get the SVE2 feature enabled. If we used the balanced -mcpu=neoverse-512tvb, we wouldn't get SVE2 without fiddly extra flags. ``` $ ~/clang+llvm-18.1.8-aarch64-linux-gnu/bin/clang /tmp/test.c -o /dev/null -mcpu=neoverse-v2 -### <...> "-target-feature" "+sve" "-target-feature" "+sve2-bitperm" "-target-feature" "+sve2" <...> ``` I have not added vector length settings as these builders will generate scalable ("length agnostic" - LA) code. Otherwise, the builders have identical setups to the existing SVE VLA builders.
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CI failure is due to an unrelated change, merging. |
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These generate code that uses the SVE2 extension, as opposed to our existing builders that only use SVE. Therefore they will run on our Graviton 4 workers only, which are Neoverse v2 cores with SVE and SVE2.
The optimisation guide:
https://github.com/aws/aws-graviton-getting-started/blob/main/c-c++.md
Suggests -mcpu=neoverse-v2 for best performance, but here I'm using it just so we get the SVE2 feature enabled. If we used the balanced -mcpu=neoverse-512tvb, we wouldn't get SVE2 without fiddly extra flags.
I have not added vector length settings as these builders will generate scalable ("length agnostic" - LA) code.
Otherwise, the builders have identical setups to the existing SVE VLA builders.