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4 Commits

Author SHA1 Message Date
Nadav Rotem
7b7585d153 Revert 179071 because it is not the right way to support non standard new/new[] operators. 
llvm-svn: 179084
 2013-04-09 04:43:46 +00:00
Nadav Rotem
9dd90ac5b4 c++ new operators are not malloc-like functions because they do not return uninitialized memory. 
Users may overide new-operators and implement any function that they like.

llvm-svn: 179071
 2013-04-08 23:40:47 +00:00
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