2 Commits

Author	SHA1	Message	Date
Nuno Lopes	f3ba9a4d21	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	009e7f08aa	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