#9638: Speed up Data.Char.isDigit -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: ekmett Type: feature request | Status: new Priority: normal | Milestone: 7.12.1 Component: Core Libraries | Version: 7.9 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * cc: core-libraries-committee@… (added) Comment: dfeuer, is 31571270625a690410b794b7cfe48d866c084e74/ghc sufficient to close this ticket or is there more to be done here? {{{ Author: David Feuer <> Date: Tue Oct 21 15:01:14 2014 -0500 Improve isDigit, isSpace, etc. Summary: Make things less branchy; use unsigned comparisons for range checking. Eliminate non-spaces more quickly in common cases in isSpace. Reviewers: ekmett, carter, austin Reviewed By: austin Subscribers: thomie, carter, ezyang, simonmar Differential Revision: https://phabricator.haskell.org/D340 GHC Trac Issues: #1473 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9638#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler