#5631: Compilation slowdown from 7.0.x to 7.2.x
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Reporter: bjpop | Owner: simonpj
Type: bug | Status: new
Priority: highest | Milestone: 7.4.1
Component: Compiler | Version: 7.2.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Compile-time performance bug
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Comment(by marlowsd@…):
commit ed043776f3363b2b9e56f1e9836a250f43c28d26
{{{
Author: Simon Marlow <[email protected]>
Date: Tue Nov 22 14:09:05 2011 +0000
uType_defer: only call mkErrInfo if -ddump-tc-trace is on (#5631)
Profiling shows we're wasting a lot of time calling mkErrInfo and
tidying the context, work that is wasted if we're not tracing.
There is more to this compilation performance regression than this,
but this is one bug.
compiler/typecheck/TcUnify.lhs | 13 +++++++++----
1 files changed, 9 insertions(+), 4 deletions(-)
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5631#comment:6>
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