On 10/01/2012 02:42, David Terei wrote:
Repository : ssh://darcs.haskell.org//srv/darcs/ghc
On branch : master
http://hackage.haskell.org/trac/ghc/changeset/4384e146640230399b38cd62e8e5df391f72c3a7
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commit 4384e146640230399b38cd62e8e5df391f72c3a7
Author: David Terei<[email protected]>
Date: Tue Jan 3 18:07:05 2012 +1100
Track STG live register information for use in LLVM
We now carry around with CmmJump statements a list of
the STG registers that are live at that jump site.
This is used by the LLVM backend so it can avoid
unnesecarily passing around dead registers, improving
perfromance. This gives us the framework to finally
fix trac #4308.
Good stuff! We need to do this in the new code gen too, and we can also
take advantage of this information in the native backends (do ordinary
register allocation for the Rx/Fx/Dx regs rather than assuming they're
always live).
Cheers,
Simon
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