#1246: <= operators get compiled worse than ==
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Reporter: duncan | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.6
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: x86
Os: Unknown |
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Comment (by duncan):
I'm not suggesting any unrolling. I just think the code gen can do better
with <=# cases. It may well be that at the very low level there is a one
or two instruction advantage to comparisons to zero, but I don't think
that's the issue here.
I'm convinced that the stg -> cmm -> asm/c translation is not doing as
good a job as it could do for these cases. I tried breifly to understand
the cmm code from my examples above but didn't get far.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1246>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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