On 18/10/2013 18:21, git@git.haskell.org wrote:

@@ -259,13 +261,15 @@ test('T783', # 2012-10-08: 226907420 (x86/Linux) # 2013-02-10: 329202116 (x86/Windows) # 2013-02-10: 338465200 (x86/OSX) - (wordsize(64), 640324528, 10)]), + (wordsize(64), 734038080, 10)]), # prev: 349263216 (amd64/Linux) # 07/08/2012: 384479856 (amd64/Linux) # 29/08/2012: 436927840 (amd64/Linux) # 12/11/2012: 640324528 (amd64/Linux) # (OldCmm removed: not sure why this got worse, the # other perf tests remained about the same) + # 18/10/2013: 734038080 (amd64/Linux) + # (fix for #8456)

Yikes! 10% just for that change to CmmContFlowOpt? Are you sure? Cheers, Simon