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4 Commits

Author SHA1 Message Date
Dan Gohman
a10756ee65 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94061 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-21 02:09:26 +00:00
Dan Gohman
f1b4d26e67 Reapply the MOV64r0 patch, with a fix: MOV64r0 clobbers EFLAGS. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93229 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-12 04:42:54 +00:00
Evan Cheng
05920b8146 Revert 93158. It's breaking quite a few x86_64 tests. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93185 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-11 21:13:41 +00:00
Dan Gohman
71c25b7d7b Re-instate MOV64r0 and MOV16r0, with adjustments to work with the 
new AsmPrinter. This is perhaps less elegant than describing them
in terms of MOV32r0 and subreg operations, but it allows the
current register to rematerialize them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93158 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-11 17:37:57 +00:00