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Author SHA1 Message Date
Nuno Lopes fa0dffccee teach instcombine to remove allocated buffers even if there are stores, memcpy/memmove/memset, and objectsize users. 
This means we can do cheap DSE for heap memory.
Nothing is done if the pointer excapes or has a load.

The churn in the tests is mostly due to objectsize, since we want to make sure we
don't delete the malloc call before evaluating the objectsize (otherwise it becomes -1/0)

llvm-svn: 159876
 2012-07-06 23:09:25 +00:00
Nuno Lopes 771e7bd4ba instcombine: disable optimization of 'invoke null/undef'. I'll move this functionality to SimplifyCFG (since we cannot make changes to the CFG here). 
Fixes the crashes with the attached test case

llvm-svn: 158951
 2012-06-21 23:52:14 +00:00