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Asked: 2026-05-12T14:00:07+00:00

Is it possible to get GHC to produce SIMD code for the various SSE

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Is it possible to get GHC to produce SIMD code for the various SSE generations?

Eg. got a program like this

import Data.Array.Vector
main = print . sumU $ (enumFromToFracU 1 10000000 :: UArr Double)

I can see the generated code (compiled for 64 bit x86) use SSE instructions in scalar mode (both C and asm backends). So addsd rather than addpd. For the types of programs I work on the use of vector instructions is important for performance. Is there an easy way for a newbie such as myself to get GHC to SIMDize the code using SSE?

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1 Answer

  1. Editorial Team

    Yes, it is possible, via the C backend, but it is trial and error.
    The flags I use:

     gcc -O2 -funbox-strict-fields -fvia-C -optc-O3 -march=native -optc-msse4

    Then hope GCC spots the tight loop GHC generates via the uvector code, and realises there is SIMD potential.

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