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Sjoerd Meijer 0ea77502e2 [LoopFlatten] Updating Phi nodes after IV widening
In rG6a076fa9539e, a problem with updating the old/narrow phi nodes after IV
widening was introduced. If after widening of the IV the transformation is
*not* applied, the narrow phi node was incorrectly modified, which should only
happen if flattening happens. This can be seen in the added test widen-iv2.ll,
which incorrectly had 1 incoming value, but should have its original 2 incoming
values, which is now restored.

Differential Revision: https://reviews.llvm.org/D110234
2021-09-28 15:09:20 +01:00
.github Removing the main to master sync GitHub workflow. 2021-01-28 12:18:25 -08:00
clang Refine the constraint for isInlineBuiltinDeclaration 2021-09-28 16:07:33 +02:00
clang-tools-extra Add support for `NOLINTBEGIN` ... `NOLINTEND` comments 2021-09-28 07:53:23 -04:00
compiler-rt Revert "tsan: fix trace tests on darwin" 2021-09-27 20:17:17 -05:00
cross-project-tests Reapply "[Dexter] Improve performance by evaluating expressions only when needed" 2021-09-24 10:38:19 +01:00
flang Reland "[flang] GET_COMMAND_ARGUMENT runtime implementation" 2021-09-28 12:34:07 +00:00
libc [libc] Add an implementation of qsort. 2021-09-24 19:22:45 +00:00
libclc libclc: Fix rounding during type conversion 2021-08-19 22:24:19 -07:00
libcxx [libc++][NFC] s/enable_if<...>::type/enable_if_t<...> in span 2021-09-27 19:21:07 -04:00
libcxxabi [demangle] Support for ISO/IEC TS 18661 binary floating point type 2021-09-23 11:02:58 +08:00
libunwind [libunwind] Support cfi_undefined and cfi_register for float registers. 2021-09-27 12:04:02 +02:00
lld [ELF] Support symbol names with space in linker script expressions 2021-09-27 09:50:42 -07:00
lldb [lldb/test] Remove a check from TestLoadAfterAttach 2021-09-28 14:47:46 +02:00
llvm [LoopFlatten] Updating Phi nodes after IV widening 2021-09-28 15:09:20 +01:00
mlir [mlir] Add min/max operations to Standard. 2021-09-28 09:40:22 +02:00
openmp [libomptarget][amdgpu] Follow on to D110513, empty kernarg pools are not fatal 2021-09-27 22:44:35 +01:00
parallel-libs Reapply "Try enabling -Wsuggest-override again, using add_compile_options instead of add_compile_definitions for disabling it in unittests/ directories." 2020-07-22 17:50:19 -07:00
polly [Polly] Reject regions entered by an indirectbr/callbr. 2021-09-27 18:49:11 -05:00
pstl [libc++] Remove test-suite annotations for unsupported Clang versions 2021-08-20 15:05:13 -04:00
runtimes [LLVM][CMake][NFC] Resolve FIXME: Rename LLVM_CMAKE_PATH to LLVM_CMAKE_DIR throughout the project 2021-09-16 18:29:57 +02:00
utils [mlir][Linalg] Refactor padding hoisting - NFC 2021-09-27 09:50:31 +00:00
.arcconfig Add modern arc config for default "onto" branch 2021-02-22 11:58:13 -08:00
.arclint PR46997: don't run clang-format on clang's testcases. 2020-08-04 17:53:25 -07:00
.clang-format Revert "Title: [RISCV] Add missing part of instruction vmsge {u}. VX Review By: craig.topper Differential Revision : https://reviews.llvm.org/D100115" 2021-04-14 08:04:37 +01:00
.clang-tidy .clang-tidy: Disable misc-no-recursion in general/across the monorepo 2021-06-08 08:31:33 -07:00
.git-blame-ignore-revs [lldb] Add 9494c510af to .git-blame-ignore-revs 2021-06-10 09:29:59 -07:00
.gitignore [NFC] Add CMakeUserPresets.json filename to .gitignore 2021-01-22 12:45:29 +01:00
.mailmap [mailmap] Add entry for myself 2021-09-22 10:12:16 -04:00
CONTRIBUTING.md
README.md [NFC] Update the list of subprojects in docs. 2021-09-21 17:27:13 +02:00
SECURITY.md [docs] Describe reporting security issues on the chromium tracker. 2021-05-19 15:21:50 -07:00

README.md

The LLVM Compiler Infrastructure

This directory and its sub-directories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The README briefly describes how to get started with building LLVM. For more information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

Getting Started with the LLVM System

Taken from https://llvm.org/docs/GettingStarted.html.

Overview

Welcome to the LLVM project!

The LLVM project has multiple components. The core of the project is itself called "LLVM". This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer. It also contains basic regression tests.

C-like languages use the Clang front end. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.

Other components include: the libc++ C++ standard library, the LLD linker, and more.

Getting the Source Code and Building LLVM

The LLVM Getting Started documentation may be out of date. The Clang Getting Started page might have more accurate information.

This is an example work-flow and configuration to get and build the LLVM source:

  1. Checkout LLVM (including related sub-projects like Clang):

    • git clone https://github.com/llvm/llvm-project.git

    • Or, on windows, git clone --config core.autocrlf=false https://github.com/llvm/llvm-project.git

  2. Configure and build LLVM and Clang:

    • cd llvm-project

    • cmake -S llvm -B build -G <generator> [options]

      Some common build system generators are:

      • Ninja --- for generating Ninja build files. Most llvm developers use Ninja.
      • Unix Makefiles --- for generating make-compatible parallel makefiles.
      • Visual Studio --- for generating Visual Studio projects and solutions.
      • Xcode --- for generating Xcode projects.

      Some Common options:

      • -DLLVM_ENABLE_PROJECTS='...' --- semicolon-separated list of the LLVM sub-projects you'd like to additionally build. Can include any of: clang, clang-tools-extra, compiler-rt,cross-project-tests, flang, libc, libclc, libcxx, libcxxabi, libunwind, lld, lldb, mlir, openmp, parallel-libs, polly, or pstl.

        For example, to build LLVM, Clang, libcxx, and libcxxabi, use -DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi".

      • -DCMAKE_INSTALL_PREFIX=directory --- Specify for directory the full path name of where you want the LLVM tools and libraries to be installed (default /usr/local).

      • -DCMAKE_BUILD_TYPE=type --- Valid options for type are Debug, Release, RelWithDebInfo, and MinSizeRel. Default is Debug.

      • -DLLVM_ENABLE_ASSERTIONS=On --- Compile with assertion checks enabled (default is Yes for Debug builds, No for all other build types).

    • cmake --build build [-- [options] <target>] or your build system specified above directly.

      • The default target (i.e. ninja or make) will build all of LLVM.

      • The check-all target (i.e. ninja check-all) will run the regression tests to ensure everything is in working order.

      • CMake will generate targets for each tool and library, and most LLVM sub-projects generate their own check-<project> target.

      • Running a serial build will be slow. To improve speed, try running a parallel build. That's done by default in Ninja; for make, use the option -j NNN, where NNN is the number of parallel jobs, e.g. the number of CPUs you have.

    • For more information see CMake

Consult the Getting Started with LLVM page for detailed information on configuring and compiling LLVM. You can visit Directory Layout to learn about the layout of the source code tree.