#2253: Native code generator could do better
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Reporter: dons | Owner:
Type: run-time performance bug | Status: new
Priority: normal | Milestone: 6.12 branch
Component: Compiler (NCG) | Version: 6.8.2
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Comment (by simonmar):
The main problem here is those extra reg->reg moves between argument
registers (e.g. %rsi) and temporary registers (e.g. %rax).
One way to fix it is to make cmmMiniInline a little smarter, by
substituting for assignments of temporaries from global regs. The new
register allocator might also do better. However, the new backend will
solve this in a much better way, by having liveness information about
global registers.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2253#comment:9>
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