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Sanjay Patel 2c5b9e376b [ARM] don't transform an add(ext Cond), C to select unless there's a setcc of the condition 
The transform in question claims to be doing:

// fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))

...starting in PerformADDCombineWithOperands(), but it wasn't actually checking for a setcc node
for the sext/zext patterns.

This is exactly the opposite of a transform I'd like to add to DAGCombiner's foldSelectOfConstants(),
so I was seeing infinite loops with my draft of a patch applied.

The changes in select_const.ll look positive (less instructions). The change in arm-and-tst-peephole.ll
is unrelated. We're changing the input IR in that test to preserve the intent of the test, but that's 
not affected by this code change.

Differential Revision:
https://reviews.llvm.org/D30355



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296389 91177308-0d34-0410-b5e6-96231b3b80d8
2017-02-27 21:30:54 +00:00
bindings Go binding: Add methods for missing PassManagerBuilder C APIs 2017-02-17 05:41:05 +00:00
cmake [Support] Provide linux/magic.h fallback for older kernels 2017-02-22 18:09:15 +00:00
docs [Support][Error] Add a 'cantFail' utility function for known-safe calls to 2017-02-27 21:09:47 +00:00
examples llvm/examples/Kaleidoscope/BuildingAJIT: More fixup corresponding to r295636. 2017-02-20 10:07:41 +00:00
include [Support][Error] Add a 'cantFail' utility function for known-safe calls to 2017-02-27 21:09:47 +00:00
lib [ARM] don't transform an add(ext Cond), C to select unless there's a setcc of the condition 2017-02-27 21:30:54 +00:00
projects [CMake] Correct configuration order of the sub-projects based on ther dependancies 2016-10-09 20:38:29 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes [CMake] Handle common options for runtimes build 2017-01-10 19:47:05 +00:00
test [ARM] don't transform an add(ext Cond), C to select unless there's a setcc of the condition 2017-02-27 21:30:54 +00:00
tools llvm-mc-fuzzer: add support for assembly 2017-02-27 06:22:17 +00:00
unittests [Support][Error] Add a 'cantFail' utility function for known-safe calls to 2017-02-27 21:09:47 +00:00
utils [utils] allow auto-generation of checks for thumb triples 2017-02-24 21:47:44 +00:00
.arcconfig project_id is from another era in phabricator land and does not provide any value. 2016-09-27 15:47:29 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitignore [.gitignore] Update .gitignore to ignore a nested build directory 2017-02-24 23:09:30 +00:00
CMakeLists.txt [Tablegen] Instrumenting table gen DAGGenISelDAG 2017-02-14 18:32:41 +00:00
CODE_OWNERS.TXT Collapse my two entries in CODE_OWNERS.txt 2017-02-15 23:45:21 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Revert r294228 2017-02-06 19:40:56 +00:00
LICENSE.TXT Bump year to 2017 in LICENSE.txt 2017-01-12 18:02:42 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
README.txt Test commit: remove a blank line. 2017-02-03 10:56:57 +00:00
RELEASE_TESTERS.TXT Update the release tester for MIPS. NFC. 2017-01-17 11:00:28 +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.