[GHC] #8971: Native Code Generator for 7.8 is not as optimized as 7.6.3...
GHC
ghc-devs at haskell.org
Fri May 16 01:25:15 UTC 2014
#8971: Native Code Generator for 7.8 is not as optimized as 7.6.3...
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Reporter: GordonBGood | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 7.10.1
Component: Compiler (NCG) | Version: 7.8.1-rc2
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 GordonBGood):
Replying to [comment:17 simonmar]:
> The short version is that this isn't going to be easy to fix, and I
recommend using LLVM.
In fact, I prefer LLVM because it is more consistent for timing, but of
course that brings us to that other bug for 64-bit Windows where 64-bit
GHC 7.8.2 still doesn't work with LLVM (3.4/3.5) at least for mingw as per
the distrubuted binary, although it does under 64-bit Linux. The above
test program runs under LLVM for a 32-bit compile but crashes on run for
64-bit, both on Windows.
Or perhaps there is something wrong with my compile of 64-bit LLVM even
though I followed the exact same procedure as generating the 32-bit
version from trunk. Don Stewart's entry that working LLVM should really
be distributed with GHC is a very good one.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8971#comment:19>
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