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Author SHA1 Message Date
Chris Lattner f29807169a Implement DeadStoreElim/alloca.llx by observing that allocas are dead at the 
end of the function (either return or unwind)

llvm-svn: 15232
 2004-07-26 06:14:11 +00:00
Chris Lattner 7b25bcdf52 * Substantially simplify how free instructions are handled (potentially fixing 
a bug in DSE).
* Delete dead operand uses iteratively instead of recursively, using a
  SetVector.
* Defer deletion of dead operand uses until the end of processing, which means
  we don't have to bother with updating the AliasSetTracker.  This speeds up
  DSE substantially.

llvm-svn: 15204
 2004-07-25 11:09:56 +00:00
Chris Lattner 4c1c1ac7e4 Free instructions kill values too. This implements DeadStoreElim/free.llx 
llvm-svn: 15199
 2004-07-25 07:58:38 +00:00
Chris Lattner bad6478b00 obvious fix 
llvm-svn: 15162
 2004-07-24 07:51:27 +00:00
Chris Lattner 3844c300de This is a trivial dead store elimination pass. It very very simple and 
can be improved in many ways.  But: stop laughing, even with -basicaa it
deletes 15% of the stores in 252.eon :)

llvm-svn: 15101
 2004-07-22 08:00:28 +00:00