Inhibiting the specialiser?

Harendra Kumar harendra.kumar at
Fri Sep 15 03:30:44 UTC 2017

As per the GHC manual, it should be -fno-specialise for disabling all
specialization, and -fno-cross-module-specialise for disabling only the
specialization of imported INLINABLE functions. Both of these flags are
"on" when using -O and -O2.


On 15 September 2017 at 07:15, Conal Elliott <conal at> wrote:

> Is there a GHC flag for inhibiting the specializer (but not all
> optimizations)? I'm seeing huge output from the Specialise phase killed at
> 4GB and growing. The output starts as follows:
> Result size of Specialise
>   = {terms: 29,639, types: 10,921,552, coercions: 4,425,185}
> Sounds like a lot to me. Is it?. I get this behavior with -O2 and with -O.
> -- Conal
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