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authorDuncan Sands <baldrick@free.fr>2012-05-22 14:17:53 +0000
committerDuncan Sands <baldrick@free.fr>2012-05-22 14:17:53 +0000
commit4df5e96d3a44c38d9cea4ca3438e378b3e97c429 (patch)
tree141095790ba2f612b8703cfc98f04cfcce2d708a /llvm/lib/Bitcode/Reader/BitcodeReader.cpp
parent5d03d456431ca294ac9ccc878a1dd78c54c90fbc (diff)
downloadbcm5719-llvm-4df5e96d3a44c38d9cea4ca3438e378b3e97c429.tar.gz
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Fix PR12858, a crash due to GVN's PRE not fully removing an instruction from the
leader table. That's because it wasn't expecting instructions to turn up as leader for a value number that is not its own, but equality propagation could create this situation. One solution is to have the leader table use a WeakVH but this slows down GVN by about 5%. Instead just have equality propagation not add instructions to the leader table, only constants and arguments. In theory this might cause GVN to run more (each time it changes something it runs again) but it doesn't seem to occur enough to cause a slow down. llvm-svn: 157251
Diffstat (limited to 'llvm/lib/Bitcode/Reader/BitcodeReader.cpp')
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