forked from OSchip/llvm-project
b5b6aa4d53
(ashr i32 X, 31) * C --> (X < 0) ? -C : 0 https://alive2.llvm.org/ce/z/G8u9SS With a constant operand, this is an improvement in IR and codegen (where it can be converted to a mask op). Without a constant operand, we would have to negate the operand, so that is probably better left to the backend. This is similar but not the same optimization that is requested in #55618. |
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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.