#8279: bad alignment in code gen yields substantial perf issue
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Reporter: carter | Owner:
Type: bug | Status: new
Priority: highest | Milestone:
Component: Compiler | Version: 7.7
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: Runtime performance bug | Unknown/Multiple
Test Case: | Difficulty: Unknown
Blocking: | Blocked By:
| Related Tickets:
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Comment (by simonmar):
I've noticed things like this in the past. One hypothesis is that when
the code is tightly packed together the branch predictor doesn't work so
well, but that's just a guess.
The way forward is to do systematic measurements with all of nofib,
measuring performance counters and code size with various alignment
strategies. Also someone could thoroughly read the latest Intel
optimization guides and see if we're doing the right things.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8279#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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