forked from OSchip/llvm-project
901acfab0c
Summary: Folding patterns like: %vec = shufflevector <4 x i8> %insvec, <4 x i8> undef, <4 x i32> zeroinitializer %cast = bitcast <4 x i8> %vec to i32 %cond = icmp eq i32 %cast, 0 into: %ext = extractelement <4 x i8> %insvec, i32 0 %cond = icmp eq i32 %ext, 0 Combined with existing rules, this allows us to fold patterns like: %insvec = insertelement <4 x i8> undef, i8 %val, i32 0 %vec = shufflevector <4 x i8> %insvec, <4 x i8> undef, <4 x i32> zeroinitializer %cast = bitcast <4 x i8> %vec to i32 %cond = icmp eq i32 %cast, 0 into: %cond = icmp eq i8 %val, 0 When we construct a splat vector via a shuffle, and bitcast the vector into an integer type for comparison against an integer constant. Then we can simplify the the comparison to compare the splatted value against the integer constant. Reviewers: spatel, anna, mkazantsev Reviewed By: spatel Subscribers: efriedma, rengolin, llvm-commits Differential Revision: https://reviews.llvm.org/D44997 llvm-svn: 329087 |
||
|---|---|---|
| .. | ||
| bindings | ||
| cmake | ||
| docs | ||
| examples | ||
| include | ||
| lib | ||
| projects | ||
| resources | ||
| runtimes | ||
| test | ||
| tools | ||
| unittests | ||
| utils | ||
| .arcconfig | ||
| .clang-format | ||
| .clang-tidy | ||
| .gitattributes | ||
| .gitignore | ||
| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| LLVMBuild.txt | ||
| README.txt | ||
| RELEASE_TESTERS.TXT | ||
| configure | ||
| llvm.spec.in | ||
README.txt
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.