[commit: ghc] master: Performance changes (bb87726)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/bb8772662d48b27966422d00356b468bacff377f/ghc

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

commit bb8772662d48b27966422d00356b468bacff377f
Author: Simon Peyton Jones <simonpj at microsoft.com>
Date:   Fri May 23 13:49:04 2014 +0100

    Performance changes
    
    * T1969 improves, perhaps because of better specialiation
    
    * T5642 (a bizarre case) worsens, because we get lots and lots
      of specialisations of imported functions for the lots and
      lots of data types T5642 declares


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

bb8772662d48b27966422d00356b468bacff377f
 testsuite/tests/perf/compiler/all.T | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/testsuite/tests/perf/compiler/all.T b/testsuite/tests/perf/compiler/all.T
index 10eecba..15fdb79 100644
--- a/testsuite/tests/perf/compiler/all.T
+++ b/testsuite/tests/perf/compiler/all.T
@@ -74,6 +74,7 @@ test('T1969',
              # 2014-01-22 316103268 (x86/Linux)
              # 2014-06-29 303300692 (x86/Linux)
            (wordsize(64), 651626680, 5)]),
+           (wordsize(64), 625525224, 5)]),
              # 17/11/2009 434845560 (amd64/Linux)
              # 08/12/2009 459776680 (amd64/Linux)
              # 17/05/2010 519377728 (amd64/Linux)
@@ -396,6 +397,11 @@ test('T5642',
             # prev:        1300000000
             # 2014-07-17:  1358833928 (general round of updates)
             # 2014-08-07:  1402242360 (caused by 1fc60ea)
+# Watch out for:
+            # 23/05/2014: 1452688392 (More aggressive specialisation means we get
+            #                         specialised copies of imported functions that
+            #                         are ultimately discarded by trimAutoRules
+            #                         It's a bizarre program with LOTS of data types)
       ],
       compile,['-O'])