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[mono][jit] Reenable branch optimizations when running with llvm.#97189

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vargaz merged 4 commits intodotnet:mainfrom
vargaz:llvm-branch2
Jan 29, 2024
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[mono][jit] Reenable branch optimizations when running with llvm.#97189
vargaz merged 4 commits intodotnet:mainfrom
vargaz:llvm-branch2

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@vargaz vargaz commented Jan 19, 2024

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vargaz commented Jan 19, 2024

/azp run runtime-extra-platforms

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vargaz commented Jan 21, 2024

/azp run runtime-ioslike

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vargaz commented Jan 23, 2024

/azp run runtime-wasm

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@vargaz vargaz marked this pull request as ready for review January 24, 2024 18:05
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vargaz commented Jan 25, 2024

/azp run runtime-ioslike

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vargaz commented Jan 25, 2024

/azp run runtime

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vargaz commented Jan 25, 2024

This PR will reduce both executable size and aot compiler memory usage by eliminating code early. Previously, we were only running branch optimizations in opt/llc, so if we had code like:
if (Vector.IsSupported)
the aot compiler couldn't figure out that was not needed, so it ended up generating a lot of extra vector generic instances.

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vargaz commented Jan 25, 2024

/azp runtime-extra-platforms

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vargaz commented Jan 25, 2024

/azp run runtime-extra-platforms

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vargaz added 2 commits January 25, 2024 18:34
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[mono][llvm] Fix the return type of OP_SSE2_PACKUS.
c927f3f 
This is supposed to return a 16xi8 so there is no need to cast it.
This only worked by accident because the phi handling code casted it
to the right type most of the time.
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Disable moving out of line bblocks to the end of code when using llvm.
813974b
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vargaz commented Jan 26, 2024

/azp run runtime-extra-platforms

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vargaz commented Jan 26, 2024

This saves around 120k on an aot hello world on wasm.

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vargaz commented Jan 26, 2024

Failures are probably unrelated, the llvm lanes are timing out.

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kg approved these changes Jan 29, 2024
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I assume the changes to lhs are to fix crashes you hit while doing this. Looks fine to me.

@vargaz vargaz merged commit 027a43b into dotnet:main Jan 29, 2024
@vargaz vargaz deleted the llvm-branch2 branch January 29, 2024 18:34
@vargaz vargaz mentioned this pull request Jan 31, 2024
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@kg kg kg approved these changes

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