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51e92d172e
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Geoff Berry 51e92d172e [AArch64] Improve add/sub/cmp isel of uxtw forms. 
Don't match the UXTW extended reg forms of ADD/ADDS/SUB/SUBS if the
32-bit to 64-bit zero-extend can be done for free by taking advantage
of the 32-bit defining instruction zeroing the upper 32-bits of the X
register destination.  This enables better instruction selection in a
few cases, such as:

  sub x0, xzr, x8
  instead of:
  mov x8, xzr
  sub x0, x8, w9, uxtw

  madd x0, x1, x1, x8
  instead of:
  mul x9, x1, x1
  add x0, x9, w8, uxtw

  cmp x2, x8
  instead of:
  sub x8, x2, w8, uxtw
  cmp x8, #0

  add x0, x8, x1, lsl #3
  instead of:
  lsl x9, x1, #3
  add x0, x9, w8, uxtw

Reviewers: t.p.northover, jmolloy

Subscribers: mcrosier, aemerson, llvm-commits, rengolin

Differential Revision: https://reviews.llvm.org/D24747

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282413 91177308-0d34-0410-b5e6-96231b3b80d8
2016-09-26 15:34:47 +00:00
bindings Formatting with clang-format patch r280700 2016-09-06 17:03:02 +00:00
cmake cmake: Support overriding Sphinx HTML doc install directory 2016-09-23 11:09:33 +00:00
docs cmake: Support overriding Sphinx HTML doc install directory 2016-09-23 11:09:33 +00:00
examples [Kaleidoscope] Make Chapter 2 use llvm::make_unique, rather than a helper. 2016-09-19 23:00:27 +00:00
include Add support to optionally limit the size of jump tables. 2016-09-26 15:32:33 +00:00
lib [AArch64] Improve add/sub/cmp isel of uxtw forms. 2016-09-26 15:34:47 +00:00
projects Enable in-tree builds of parallel-libs. 2016-09-09 21:34:12 +00:00
resources
runtimes [CMake] Fixing lit for runtimes directory 2016-09-15 06:14:13 +00:00
test [AArch64] Improve add/sub/cmp isel of uxtw forms. 2016-09-26 15:34:47 +00:00
tools Revert "[AMDGPU] Disassembler: print label names in branch instructions" 2016-09-26 11:29:03 +00:00
unittests [PM] Refactor this unittest a bit to remove duplicated code. This was 2016-09-26 06:29:21 +00:00
utils [utils] Teach the code coverage prep script about --restrict 2016-09-22 21:49:49 +00:00
.arcconfig Upgrade all the .arcconfigs to https. 2016-07-14 13:15:37 +00:00
.clang-format
.clang-tidy .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitignore gitignore: ignore VS Code editor files 2016-09-02 22:54:26 +00:00
CMakeLists.txt Try to fix a circular dependency in the modules build. 2016-09-06 20:16:19 +00:00
CODE_OWNERS.TXT Take ownership of libLTO as discussed on llvm-dev. 2016-09-15 17:42:39 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Shamelessly add myself to CREDITS.TXT 2016-08-04 16:28:22 +00:00
LICENSE.TXT Remove autoconf references from LICENSE.TXT 2016-08-12 20:11:03 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Revert rL277454 2016-08-02 13:26:07 +00:00
RELEASE_TESTERS.TXT Adding RELEASE_TESTERS.TXT 2016-07-21 16:46:44 +00:00

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.