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Roman Lebedev 1d9ec7a81b [DAGCombiner][X86][AArch64][AMDGPU] (x + C) - y -> (x - y) + C fold. Try 3 
Summary:
The main motivation is shown by all these `neg` instructions that are now created.
In particular, the `@reg32_lshr_by_negated_unfolded_sub_b` test.

AArch64 test changes all look good (`neg` created), or neutral.

X86 changes look neutral (vectors), or good (`neg` / `xor eax, eax` created).

I'm not sure about `X86/ragreedy-hoist-spill.ll`, it looks like the spill
is now hoisted into preheader (which should still be good?),
2 4-byte reloads become 1 8-byte reload, and are elsewhere,
but i'm not sure how that affects that loop.

I'm unable to interpret AMDGPU change, looks neutral-ish?

This is hopefully a step towards solving [[ https://bugs.llvm.org/show_bug.cgi?id=41952 | PR41952 ]].

https://rise4fun.com/Alive/pkdq (we are missing more patterns, i'll submit them later)

This is a recommit, originally committed in rL361852, but reverted
to investigate test-suite compile-time hangs, and then reverted in
rL362109 to fix missing constant folds that were causing
endless combine loops.

Reviewers: craig.topper, RKSimon, spatel, arsenm

Reviewed By: RKSimon

Subscribers: bjope, qcolombet, kzhuravl, jvesely, wdng, nhaehnle, yaxunl, javed.absar, dstuttard, tpr, t-tye, kristof.beyls, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62223

llvm-svn: 362142
 		2019-05-30 20:36:54 +00:00
clang Mark test as requiring an ARM target. 2019-05-30 20:02:51 +00:00
clang-tools-extra [Index] Compute correct symbol kind for variable templates 2019-05-29 17:49:30 +00:00
compiler-rt [GWP-ASan] Mutex implementation [2]. 2019-05-30 19:45:32 +00:00
debuginfo-tests Move the pybool logic from CMake to Python for simplicity 2019-05-29 21:45:43 +00:00
libclc travis: Add LLVM-8 build 2019-03-27 21:28:31 +00:00
libcxx [libcxx] Add regex test cases from PR40904 2019-05-30 16:53:05 +00:00
libcxxabi [libcxx][libcxxabi] Remove the unused CMake checks 2019-05-30 06:08:56 +00:00
libunwind [Docs] Modernize references to macOS 2019-05-30 16:46:22 +00:00
lld [Docs] Modernize references to macOS 2019-05-30 16:46:22 +00:00
lldb Code and comment cleanups [NFC] 2019-05-30 17:03:35 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [DAGCombiner][X86][AArch64][AMDGPU] (x + C) - y -> (x - y) + C fold. Try 3 2019-05-30 20:36:54 +00:00
openmp Fix OMP_TARGET_OFFLOAD parsing 2019-05-30 18:35:07 +00:00
parallel-libs Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
polly [ScopBuilder] Move buildInvariantEquivalenceClasses function from ScopInfo. NFC. 2019-05-28 23:47:55 +00:00
pstl [pstl] Make the default backend be the serial backend and always provide parallel policies 2019-04-24 20:12:36 +00:00
.arcconfig Update monorepo .arcconfig with new project callsign. 2019-01-31 14:34:59 +00:00
.clang-format Add .clang-tidy and .clang-format files to the toplevel of the 2019-01-29 16:43:16 +00:00
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitignore Add a reduced copy of the llvm .gitignore 2019-04-09 00:52:49 +00:00
README.md
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README.md

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.