[commit: ghc] master: Simplify and improve CSE (b78fa75)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/b78fa759bfb405e3dc20d5e4bbb088989d17eb8b/ghc

>---------------------------------------------------------------

commit b78fa759bfb405e3dc20d5e4bbb088989d17eb8b
Author: Simon Peyton Jones <simonpj at microsoft.com>
Date:   Fri Jan 20 12:05:16 2017 +0000

    Simplify and improve CSE
    
    Trac #13156 showed a lost opportunity for CSE. I found that it was
    easy to fix, and it had the nice side effect of rendering a previous
    nasty case, described in Note [Corner case for case expressions],
    unnecessary.
    
    Simpler code, does more.  Great.


>---------------------------------------------------------------

b78fa759bfb405e3dc20d5e4bbb088989d17eb8b
 compiler/simplCore/CSE.hs                          | 70 ++++++++++++----------
 testsuite/tests/simplCore/should_compile/Makefile  |  5 ++
 testsuite/tests/simplCore/should_compile/T13156.hs | 42 +++++++++++++
 .../tests/simplCore/should_compile/T13156.stdout   |  2 +
 testsuite/tests/simplCore/should_compile/all.T     |  2 +-
 5 files changed, 89 insertions(+), 32 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc b78fa759bfb405e3dc20d5e4bbb088989d17eb8b