forked from OSchip/llvm-project
d802270808
This is an almost direct move of the functionality from InstCombine to InstSimplify. There's no reason not to do this in InstSimplify because we never create a new value with this transform. (There's a question of whether any dominance-based transform belongs in either of these passes, but that's a separate issue.) I've changed 1 of the conditions for the fold (1 of the blocks for the branch must be the block we started with) into an assert because I'm not sure how that could ever be false. We need 1 extra check to make sure that the instruction itself is in a basic block because passes other than InstCombine may be using InstSimplify as an analysis on values that are not wired up yet. The 3-way compare changes show that InstCombine has some kind of phase-ordering hole. Otherwise, we would have already gotten the intended final result that we now show here. llvm-svn: 347896 |
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README.txt
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.