search for: regex6

...figure this out eventually, but if somebody else sees the answer instantly, I certainly won't complain. :-) Here are the optimizers I'm running: opt -f -simplifycfg -dce -instcombine -anders-aa -load-vn -licm -o regex-opt.bc regex.bc The duplicate loads appear at the top of the %regex6 and %regex2 blocks below. I've tried various alias analysis implementations either alone or in combination. Any thoughts? I'm sure that this will prove embarrassingly obvious. :-) Cheers, Eric ; ModuleID = 'regex-opt.bc' implementation ; Functions: bool %matches(ubyte* %b...

...plain. :-) There are no stupid questions. Some are just easier to answer than others :) > Here are the optimizers I'm running: > > opt -f -simplifycfg -dce -instcombine -anders-aa -load-vn -licm -o > regex-opt.bc regex.bc > > The duplicate loads appear at the top of the %regex6 and %regex2 blocks > below. I've tried various alias analysis implementations either alone or in > combination. LICM doesn't remove common subexpressions, also -load-vn doesn't affect LICM. Try "-licm -load-vn -gcse" instead of "-load-vn -licm" -Chris &g...

On Mar 16, 2006, at 8:47 PM, Chris Lattner wrote: > On Thu, 16 Mar 2006, Eric Kidd wrote: >> The duplicate loads appear at the top of the %regex6 and %regex2 >> blocks below. I've tried various alias analysis implementations >> either alone or in combination. > > LICM doesn't remove common subexpressions, also -load-vn doesn't > affect LICM. Try "-licm -load-vn -gcse" instead of "-load-v...

On Mar 17, 2006, at 7:54 AM, Eric Kidd wrote: > Unfortunately, this generates really weird code on the LLVM 1.6 > PowerPC backend: > > LBB_matches_1: ; regex6 > lbz r4, 0(r3) > LBB_matches_2: ; NodeBlock > rlwinm r5, r4, 0, 24, 31 > cmplwi cr0, r5, 98 > blt cr0, LBB_matches_4 ; LeafBlock > LBB_matches_3: ; LeafBlock1 > rlwinm r4, r4, 0, 24, 31 > cmpwi cr0, r4, 98 > beq...