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15 Commits

Author SHA1 Message Date
Benjamin Kramer a225ed8d2b SCEVExpander: Don't crash when trying to merge two constant phis. 
Just constant fold them so they can't cause any trouble. Fixes PR12627.

llvm-svn: 166286
 2012-10-19 16:37:30 +00:00
Andrew Trick db149f9e73 Remove redundant -enable-iv-rewrite=false flags from test cases. 
llvm-svn: 153255
 2012-03-22 17:09:04 +00:00
Andrew Trick 5adedf5d47 Extended replaceCongruentPhis to handle mixed phi types. 
llvm-svn: 147707
 2012-01-07 01:12:09 +00:00
Andrew Trick f9201c572e Move replaceCongruentIVs into SCEVExapander and bias toward "expanded" 
IVs.

Indvars previously chose randomly between congruent IVs. Now it will
bias the decision toward IVs that SCEVExpander likes to create. This
was not done to fix any problem, it's just a welcome side effect of
factoring code.

llvm-svn: 141633
 2011-10-11 02:28:51 +00:00
Andrew Trick 183013d8d4 Rename -disable-iv-rewrite to -enable-iv-rewrite=false in preparation for default change. 
llvm-svn: 139517
 2011-09-12 18:28:44 +00:00
Andrew Trick 638b355a16 indvars: Added getInsertPointForUses to find a valid place to truncate the IV. 
llvm-svn: 135568
 2011-07-20 05:32:06 +00:00
Andrew Trick f53622e129 indvars test case for r135558. 
llvm-svn: 135559
 2011-07-20 02:14:37 +00:00
Andrew Trick c5dd3e976a indvars -disable-iv-rewrite fix: derived GEP IVs 
llvm-svn: 135558
 2011-07-20 02:08:58 +00:00
Andrew Trick 3239055dee indvars -disable-iv-rewrite: Added SimplifyCongruentIVs. 
llvm-svn: 134530
 2011-07-06 20:50:43 +00:00
Andrew Trick 6d12309475 indvars -disable-iv-rewrite: bug fix involving weird geps and related cleanup. 
llvm-svn: 134306
 2011-07-02 02:34:25 +00:00
Andrew Trick efe89ad414 indvars -disable-iv-rewrite: handle cloning binary operators that cannot overflow. 
llvm-svn: 134177
 2011-06-30 19:02:17 +00:00
Andrew Trick cc68605353 indvars -disable-iv-rewrite: handle an edge case involving identity phis. 
llvm-svn: 134124
 2011-06-30 01:27:23 +00:00
Andrew Trick ecdd6e4c67 indvars -disable-iv-rewrite: insert new trunc instructions carefully. 
llvm-svn: 134112
 2011-06-29 23:03:57 +00:00
Andrew Trick efe2b1963d indvars -disable-iv-rewrite: just because SCEV ignores casts doesn't 
mean they can be removed.

llvm-svn: 134054
 2011-06-29 03:13:40 +00:00
Andrew Trick eb3c36e69c indvars: fixed IV cloning in -disable-iv-rewrite mode with associated 
cleanup and overdue test cases.

llvm-svn: 132038
 2011-05-25 04:42:22 +00:00