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Fix simd-op-check for top-of-tree LLVM #6529

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merged 2 commits into from
Jan 3, 2022
Merged

Fix simd-op-check for top-of-tree LLVM #6529

merged 2 commits into from
Jan 3, 2022

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steven-johnson
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@steven-johnson steven-johnson requested a review from abadams January 3, 2022 19:15
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abadams commented Jan 3, 2022

Hrm, that seems like a regression in llvm. Even if it's still a single instruction, it occupies an register with the constant. I'll take a closer look.

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Hrm, that seems like a regression in llvm. Even if it's still a single instruction, it occupies an register with the constant. I'll take a closer look.

See https://reviews.llvm.org/D116166

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abadams commented Jan 3, 2022

Ah, I was just looking for that, thanks. I guess twice the throughput is worth the extra register used nearly all of the time. Maybe add that link as a comment in the PR to explain why it's doing that?

@steven-johnson steven-johnson merged commit 2651402 into master Jan 3, 2022
@steven-johnson steven-johnson deleted the srj/tot branch January 3, 2022 20:45
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2 participants