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rts: Specialize hashing at call site rather than in struct.

Closed rts: Specialize hashing at call site rather than in struct.
wip/D4889 into master
Closed Ben Gamari requested to merge wip/D4889 into master
  1. Nov 17, 2019
    • Crazycolorz5's avatar
      rts: Specialize hashing at call site rather than in struct. · b109cb0e
      Crazycolorz5 authored and Ben Gamari's avatar Ben Gamari committed 
      Separate word and string hash tables on the type level, and do not store
the hashing function.  Thus when a different hash function is desire it
is provided upon accessing the table. This is worst case the same as
before the change, and in the majority of cases is better. Also mark the
functions for aggressive inlining to improve performance.  {F1686506}

Reviewers: bgamari, erikd, simonmar

Subscribers: rwbarton, thomie, carter

GHC Trac Issues: #13165

Differential Revision: https://phabricator.haskell.org/D4889
      b109cb0e