https://bugs.llvm.org/show_bug.cgi?id=43101
Bug ID: 43101
Summary: add pointer stack to improve garbage collection
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: pquir...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
To aid in garbage collection I think it could improve performance if C++ had a
second stack just for pointers.
The usual (rsp/rbp) would be for primitive types, return address, register
saves, etc. But add a new stack (r12/r13) that would just hold pointer types.
Since these registers are preserved any function would preserve the stack.
Functions that use this second stack could have an attribute assigned to them.
[[pointer_stack]] void my_function() {...}
The epilogue of these functions could also zero out the stack as they removed
locals, and the calling function must zero out arguments.
This would be one step closer to real-time GC. Just need to figure out how to
deal with threads that 'move' pointers around.
Just an idea.
Thanks,
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