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Author SHA1 Message Date
Aditya Nandakumar 12d060481a Remove dead instructions before Redoing 
Before reevaluating instructions, iterate over all instructions
to be reevaluated and remove trivially dead instructions and if
any of it's operands become trivially dead, mark it for deletion
until all trivially dead instructions have been removed

llvm-svn: 256773
 2016-01-04 19:48:14 +00:00
Owen Anderson 2de9f545aa Add intermediate subtract instructions to reassociation worklist. 
We sometimes create intermediate subtract instructions during
reassociation.  Adding these to the worklist to revisit exposes many
additional reassociation opportunities.

Patch by Aditya Nandakumar.

llvm-svn: 253240
 2015-11-16 18:07:30 +00:00
Dan Gohman 1c6c34834b Fix reassociate to use a worklist instead of recursing when new 
reassociation opportunities are exposed. This fixes a bug where
the nested reassociation expects to be the IR to be consistent,
but it isn't, because the outer reassociation has disconnected
some of the operands.  rdar://9167457

llvm-svn: 129324
 2011-04-12 00:11:56 +00:00