1
0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-01-31 20:51:52 +01:00
Yevgeny Rouban 0a4cf978a7 [RS4GC] Introduce intrinsics to get base ptr and offset
There can be a need for some optimizations to get (base, offset)
for any GC pointer. The base can be calculated by generating
needed instructions as it is done by the
RewriteStatepointsForGC::findBasePointer() function. The offset
can be calculated in the same way. Though to not expose the base
calculation and to make the offset calculation as simple as
ptrtoint(derived_ptr) - ptrtoint(base_ptr), which is illegal
outside RS4GC, this patch introduces 2 intrinsics:

 @llvm.experimental.gc.get.pointer.base(%derived_ptr)
 @llvm.experimental.gc.get.pointer.offset(%derived_ptr)

These intrinsics are inlined by RS4GC along with generation of
statepoint sequences.

With these new intrinsics the GC parseable lowering for atomic
memcpy intrinsics (6ec2c5e402a724ba99bce82a9cac7a3006d660f4)
could be implemented as a separate pass.

Reviewed By: reames
Differential Revision: https://reviews.llvm.org/D100445
2021-05-27 09:14:14 +07:00
2021-05-26 15:57:01 +00:00
2020-03-14 18:08:26 -07:00

The LLVM Compiler Infrastructure
================================

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.
Description
Languages
C++ 96.9%
C 1%
Python 1%
CMake 0.6%
OCaml 0.2%
Other 0.1%