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Jessica Paquette 1f262f8352 [AArch64][GlobalISel] Fold constants into G_GLOBAL_VALUE 
This is pretty much just ports `performGlobalAddressCombine` from
AArch64ISelLowering. (AArch64 doesn't use the generic DAG combine for this.)

This adds a pre-legalize combine which looks for this pattern:

```
  %g = G_GLOBAL_VALUE @x
  %ptr1 = G_PTR_ADD %g, cst1
  %ptr2 = G_PTR_ADD %g, cst2
  ...
  %ptrN = G_PTR_ADD %g, cstN
```

And then, if possible, transforms it like so:

```
  %g = G_GLOBAL_VALUE @x
  %offset_g = G_PTR_ADD %g, -min(cst)
  %ptr1 = G_PTR_ADD %offset_g, cst1
  %ptr2 = G_PTR_ADD %offset_g, cst2
  ...
  %ptrN = G_PTR_ADD %offset_g, cstN
```

Where min(cst) is the smallest out of the G_PTR_ADD constants.

This means we should save at least one G_PTR_ADD.

This also updates code in the legalizer + selector which assumes that
G_GLOBAL_VALUE will never have an offset and adds/updates relevant tests.

Differential Revision: https://reviews.llvm.org/D96624
2021-02-12 14:55:15 -08:00
benchmarks
bindings [Go] Fix bindings/go/llvm/IRBindings.cpp 2020-12-16 10:09:58 -08:00
cmake Support multi-configuration generators correctly in several config files 2021-02-11 09:32:20 -08:00
docs [docs/Coverage] Document -show-region-summary 2021-02-12 12:05:45 -08:00
examples [Draft] [examples] Move llvm/examples/OCaml-Kaleidoscope/ to llvm-archive 2021-02-11 06:52:24 +05:30
include [AA] Move Depth member from AAResults to AAQI (NFC) 2021-02-12 21:42:36 +01:00
lib [AArch64][GlobalISel] Fold constants into G_GLOBAL_VALUE 2021-02-12 14:55:15 -08:00
projects llvmbuildectomy - replace llvm-build by plain cmake 2020-11-13 10:35:24 +01:00
resources
runtimes [CMake] Split the target side of runtimes build 2021-01-11 23:39:36 -08:00
test [AArch64][GlobalISel] Fold constants into G_GLOBAL_VALUE 2021-02-12 14:55:15 -08:00
tools [CodeGen] New pass: Replace vector intrinsics with call to vector library 2021-02-12 12:53:27 -05:00
unittests [RGT][GlobalIsel] Add missing setUp() calls to legalizer unittests 2021-02-12 10:45:48 -08:00
utils [gn build] Add missing llvm-profgen dependency 2021-02-12 12:44:17 -08:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.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
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore [clangd] Store index in '.cache/clangd/index' instead of '.clangd/index' 2020-07-07 14:53:45 +02:00
CMakeLists.txt [Timer] On macOS count number of executed instructions 2021-02-11 17:26:37 +01:00
CODE_OWNERS.TXT Change XCore code owner. 2021-01-14 12:13:48 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT [NFC] Add contributors names to CREDITS.TXT 2020-10-07 13:22:55 -04:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in Update structured references to the license to the new license. 2019-01-19 11:30:51 +00:00
README.txt Test commit. 2020-03-14 18:08:26 -07:00
RELEASE_TESTERS.TXT Update the list of platforms & archs 2018-12-16 14:47:16 +00:00

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.