Erik Eckstein 99b67265b7 SLPVectorizer: limit the number of alias checks to reduce the runtime.
In case of blocks with many memory-accessing instructions, alias checking can take lot of time
(because calculating the memory dependencies has quadratic complexity).
I chose a limit which resulted in no changes when running the benchmarks.

llvm-svn: 226439
2015-01-19 09:33:38 +00:00
..