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Fraser Cormack 3b0a33d0ad [RISCV] Expand unaligned fixed-length vector memory accesses
RVV vectors must be aligned to their element types, so anything less is
unaligned.

For regular loads and stores, our custom-lowering of fixed-length
vectors meant that we opted out of LegalizeDAG's built-in unaligned
expansion. This patch adds that logic in to our custom lower function.

For masked intrinsics, we declare that anything unaligned is not legal,
leaving the ScalarizeMaskedMemIntrin pass to do the expansion for us.

Note that neither of these methods can handle the expansion of
scalable-vector memory ops, so those cases are left alone by this patch.
Scalable loads and stores already go through expansion by default but
hit an assertion, and scalable masked intrinsics will silently generate
incorrect code. It may be prudent to return an error in both of these
cases.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D102493
2021-06-02 09:27:44 +01:00
.github Removing the main to master sync GitHub workflow. 2021-01-28 12:18:25 -08:00
clang Revert "Fix tmp files being left on Windows builds." for now; 2021-06-01 19:51:47 -07:00
clang-tools-extra [clang] RecursiveASTVisitor visits ObjCPropertyRefExpr's class receiver 2021-06-01 14:45:25 -04:00
compiler-rt [NFC][msan] Fix assigned-unused warning 2021-06-02 00:09:02 -07:00
debuginfo-tests [Dexter] Remove erroneously added diff file 2021-05-25 13:36:11 +01:00
flang [flang] Add tests for REPEAT. NFC 2021-06-02 08:20:21 +00:00
libc [libc] Enable fmaf and fma on x86_64. 2021-05-13 20:51:15 +00:00
libclc Support: Stop using F_{None,Text,Append} compatibility synonyms, NFC 2021-04-30 11:00:03 -07:00
libcxx [libc++] Add a CI job to test libc++ when building for 32 bit 2021-06-01 22:07:43 -04:00
libcxxabi [libcxxabi] Use ASan interface header for declaration. NFC 2021-05-25 13:07:13 -07:00
libunwind [libunwind] fix -Wc++98-compat-extra-semi without _LIBUNWIND_HIDE_SYMBOLS 2021-05-31 08:54:53 -04:00
lld [lld/mac] Make -t work correctly with -flat_namespace 2021-06-01 19:23:39 -04:00
lldb [lldb/API] Expose triple for SBProcessInfo. 2021-06-02 11:35:11 +07:00
llvm [RISCV] Expand unaligned fixed-length vector memory accesses 2021-06-02 09:27:44 +01:00
mlir [mlir][linalg] Cleanup LinalgOp usage in sparse compiler (NFC). 2021-06-02 06:21:56 +00:00
openmp [OpenMP] Add L2-Tile equivalence for KNL 2021-06-01 14:17:13 -05:00
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] Fix SCEVLoopAddRecRewriter to avoid invalid AddRecs. 2021-06-01 09:51:05 -07:00
pstl [pstl] Workaround more errors in the test suite 2021-05-26 15:45:01 -04:00
runtimes [runtimes] Add the libc project to the list of runtimes. 2021-03-23 17:33:03 +00:00
utils/arcanist [utils] Don't print username in arcanist clang format message 2021-05-14 14:33:00 +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 - Update .clang-tidy to ignore parameters of main like functions for naming violations in clang and llvm directory 2020-01-31 16:49:45 +00:00
.git-blame-ignore-revs NFC: Add whitespace-changing revisions to .git-blame-ignore-revs 2020-09-21 20:17:24 -04:00
.gitignore [NFC] Add CMakeUserPresets.json filename to .gitignore 2021-01-22 12:45:29 +01:00
CONTRIBUTING.md
README.md Fix grammar in README.md 2021-05-12 08:48:59 -07:00
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, libcxx, libcxxabi, libunwind, lldb, compiler-rt, lld, polly, or debuginfo-tests.

        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.