[GHC] #10962: Improved arithmetic primops

[GHC]

#10962: Improved arithmetic primops
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        Reporter:  nkaretnikov       |                Owner:  nkaretnikov
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
  wiki:ImprovedArithmeticPrimops     |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"8160f42b8dad33e47b4c73ed3f9bf889462e7bfe/ghc"
 8160f42b/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="8160f42b8dad33e47b4c73ed3f9bf889462e7bfe"
 Add subWordC# on x86ish

 This adds a subWordC# primop which implements subtraction with overflow
 reporting.

 Reviewers: tibbe, goldfire, rwbarton, bgamari, austin, hvr

 Reviewed By: bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D1334

 GHC Trac Issues: #10962
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10962#comment:6>
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