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Intel Speeds Up ISPC Via LLVM/Clang LTO

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  • ms178
    replied
    Originally posted by ssokolow View Post
    I'm always reminded of Matt Pharr's The story of ispc: origins (part 1), where he quoted Tim Foley's "auto-vectorization is not a programming model" when talking about reasons Larrabee failed.
    Yeah, his blog series is legendary for all the insights behind ISPC and the related hardware features. And it is quite sad to see that AVX-512 became relevant only these days on consumer platforms.

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  • User42
    replied
    Agreed. That's why an approach like openmp makes sense (if only openmp had not grown organically, after the fact and only for 2 languages).

    Languages ought to provide primitives to express parallelism and dependence. If vectorization can be inferred, good. But expressing dependencies explicitly is always better (if only for the compiler to yell at you if you break the contract instead of breaking the auto-vectorization randomly).
    Last edited by User42; 16 November 2023, 05:47 AM.

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  • ssokolow
    replied
    I'm always reminded of Matt Pharr's The story of ispc: origins (part 1), where he quoted Tim Foley's "auto-vectorization is not a programming model" when talking about reasons Larrabee failed.

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  • zamazan4ik
    replied
    Originally posted by ms178 View Post
    PGO is next, please?! See https://github.com/llvm/llvm-project/pull/71067 for the gains of the Windows release binary.
    Unfortunately, right now for some reasons ISPC dev team has no plans for PGO: https://github.com/ispc/ispc/issues/2687

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  • ms178
    replied
    PGO is next, please?! See https://github.com/llvm/llvm-project/pull/71067 for the gains of the Windows release binary.

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  • phoronix
    started a topic Intel Speeds Up ISPC Via LLVM/Clang LTO

    Intel Speeds Up ISPC Via LLVM/Clang LTO

    Phoronix: Intel Speeds Up ISPC Via LLVM/Clang LTO

    Intel has released a new version of ISPC, their Implicit SPMD Program Compiler. The ISPC 1.22 release is clocking in a few percent faster across the board as with their release builds they are now making use of LLVM Clang's link-time optimizations (LTO) for speeding up the binaries...

    Phoronix, Linux Hardware Reviews, Linux hardware benchmarks, Linux server benchmarks, Linux benchmarking, Desktop Linux, Linux performance, Open Source graphics, Linux How To, Ubuntu benchmarks, Ubuntu hardware, Phoronix Test Suite
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