Re: [GHC] #14439: Remove redundant subtraction in (^) and stimes

#14439: Remove redundant subtraction in (^) and stimes -------------------------------------+------------------------------------- Reporter: Bodigrim | Owner: (none) Type: task | Status: patch Priority: normal | Milestone: Component: libraries/base | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4173 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ben Gamari ): In [changeset:"eb5a40cea6c64f5300c7697231cb0ede2c554388/ghc" eb5a40ce/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="eb5a40cea6c64f5300c7697231cb0ede2c554388" base: Remove redundant subtraction in (^) and stimes Subtraction `y - 1` is redundant. The value of y is guaranteed to be positive and odd, so ``` (y - 1) `quot` 2` = `y `quot` 2 ``` Test Plan: validate Reviewers: hvr, bgamari Reviewed By: bgamari Subscribers: rwbarton, thomie GHC Trac Issues: #14439 Differential Revision: https://phabricator.haskell.org/D4173 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14439#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler