Mon Sep 17 06:26:14 PDT 2007 [EMAIL PROTECTED]
* Tune coalescing in non-iterative register allocator
If iterative coalescing isn't turned on, then do a single aggressive
coalescing pass for the first build/color cycle and then back off to
conservative coalescing for subseqent passes.
Aggressive coalescing is a cheap way to eliminate lots of the reg-reg
moves, but it can make the graph less colorable - if we turn it on
for every pass then allocation for code with a large amount of register
pressure (ie SHA1) doesn't converge in a sensible number of cycles.
M ./compiler/nativeGen/RegAllocColor.hs -21 +8
M ./compiler/utils/GraphColor.hs -6 +15
M ./compiler/utils/GraphOps.hs -2
_______________________________________________
Cvs-ghc mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/cvs-ghc
