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authorMagnus Lång <[email protected]>2018-01-19 16:05:52 +0100
committerMagnus Lång <[email protected]>2018-01-19 16:05:52 +0100
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ErLLVM: Preserve precise BEAM tailcall semantics
The BEAM compiler chooses not to perform tailcall optimisations for some calls in tail position, for example to some built-in functions. However, when the ErLLVM HiPE backend is used, LLVM may choose to perform tailcall optimisation on these calls, breaking the expected semantics. To preserve the precise semantics exhibited by BEAM, the 'notail' marker, present in LLVM since version 3.8, is added to call instructions that BEAM has not turned into tail calls, which inhibits LLVM from performing tail-call optimisation in turn.
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