If a class inherits from NSObject and has an implementation, then we
can assume that ivar offsets won't need to be updated by the runtime.
This allows us to index into the object using a constant value and
avoid loading from the ivar offset variable.
This patch was adapted from one written by Pete Cooper.
rdar://problem/10132568
Differential revision: https://reviews.llvm.org/D56802
llvm-svn: 351461
Some expected attributes appear to be incorrect after
optimizations are run and llvm will strip them. Use -O0
so that llvm will not have a chance to remove them.
llvm-svn: 253458
if an ivar offset load is invariant iff inside an instance method
and ivar belongs to instance method's class and one of its super class.
// rdar://16095748
llvm-svn: 202872
Erik Pilkington