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4 Commits

Author SHA1 Message Date
Dan Gohman 045f81981a Revert LoopStrengthReduce.cpp to pre-r94061 for now. 
llvm-svn: 94123
 2010-01-22 00:46:49 +00:00
Dan Gohman 51ad99d2c5 Re-implement the main strength-reduction portion of LoopStrengthReduction. 
This new version is much more aggressive about doing "full" reduction in
cases where it reduces register pressure, and also more aggressive about
rewriting induction variables to count down (or up) to zero when doing so
reduces register pressure.

It currently uses fairly simplistic algorithms for finding reuse
opportunities, but it introduces a new framework allows it to combine
multiple strategies at once to form hybrid solutions, instead of doing
all full-reduction or all base+index.

llvm-svn: 94061
 2010-01-21 02:09:26 +00:00
Dan Gohman 40503396da Eliminate more uses of llvm-as and llvm-dis. 
llvm-svn: 81290
 2009-09-08 23:54:48 +00:00
Evan Cheng 107b06c4b9 Teach LSR sink to sink the immediate portion of the common expression back into uses if they fit in address modes of all the uses. 
llvm-svn: 65215
 2009-02-21 02:06:47 +00:00