maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
237,602 Commits 23 Branches 0 Tags 2.2 GiB
Commit Graph

2 Commits

Author SHA1 Message Date
Sanjoy Das 4e8c80382f [SCEVExpander] Fix a failed cast<> assertion 
SCEVExpander::replaceCongruentIVs assumes the backedge value of an
SCEV-analysable PHI to always be an instruction, when this is not
necessarily true.  For now address this by bailing out of the
optimization if the backedge value of the PHI is a non-Instruction.

llvm-svn: 269213
 2016-05-11 17:41:41 +00:00
Sanjoy Das abb7b93eb9 [SCEVExpander] Don't break SSA in replaceCongruentIVs 
`SCEVExpander::replaceCongruentIVs` bypasses `hoistIVInc` if both the
original and the isomorphic increments are PHI nodes.  Doing this can
break SSA if the isomorphic increment is not dominated by the original
increment.  Get rid of the bypass, and let `hoistIVInc` do the right
thing.

Fixes PR27232 (compile time crash/hang).

llvm-svn: 269212
 2016-05-11 17:41:34 +00:00