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Harpy is a library for run-time x86 code generation in Haskell programs. Harpy requires several Haskell extensions and GHC-specific features (Template Haskell, multi-parameter type classes and monad transformers). It is available from Hackage


  • 64-bit mode is not supported
  • MMX, SSE, SSE2 and SSE3 instructions and registers are not supported.
  • The disassembler supports (in principle) 64-bit mode and SSE instructions, but this has not been tested.
  • Buffer overflow checks have to be done manually with checkBufferSize or ensureBufferSize