mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-02-01 05:01:59 +01:00
e122783b00
This patch changes the way labels are referenced. Instead of referencing the basic-block label name (eg. .LBB0_0), instructions now just have an immediate which indicates the depth in the control-flow stack to find a label to jump to. This makes them much closer to what we expect to have in the binary encoding, and avoids the problem of basic-block label names not being explicit in the binary encoding. Also, it terminates blocks and loops with end_block and end_loop instructions, rather than basic-block label names, for similar reasons. This will also fix problems where two constructs appear to have the same label, because we no longer explicitly use labels, so consumers that need labels will presumably create their own labels, and presumably they won't reuse labels when they do. This patch does make the code a little more awkward to read; as a partial mitigation, this patch also introduces comments showing where the labels are, and comments on each branch showing where it's branching to. llvm-svn: 257505
Low Level Virtual Machine (LLVM) ================================ 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.