The llvm_gc_allocate function is a global function defined by the -garbage collector implementation to allocate memory. It should return a +garbage collector implementation to allocate memory. It returns a zeroed-out block of memory of the appropriate size.
@@ -242,8 +242,9 @@ collectors) need to be informed when the mutator (the program that needs garbage collection) reads or writes object references into the heap. In the case of a generational collector, it needs to keep track of which "old" generation objects have references stored into them. The amount of code that typically needs to be -executed is usually quite small, so the overall performance impact of the -inserted code is tolerable. +executed is usually quite small (and not on the critical path of any +computation), so the overall performance impact of the inserted code is +tolerable.To support garbage collectors that use read or write barriers, LLVM provides the llvm.gcread and llvm.gcwrite intrinsics. The first