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Michael Liao 9c70c574b4 [SelectionDAG] Enhance the simplification of `copyto` from `implicit-def`. 
Summary:
- The current implementation simplifies the case where the source of
  `copyto` is `implicit-def`ed. However, it only works when that
  `implicit-def` is single-used since it detects that from
  `implicit-def` and cannot determine which destination vreg should be
  used if there are multiple uses.
- This patch changes that detection when `copyto` is being emitted. If
  that `copyto`'s source is defined from `implicit-def`, it simplifies
  it. Hence, it works even that `implicit-def` is multi-used.
- Except it simplifies the internal IR, it won't improve the quality of
  code generation. However, it helps to detect 'implicit-def` in a
  straight-forward manner in some passes, such as `si-i1-copies`. A test
  case is added.

Reviewers: sunfish, nhaehnle

Subscribers: jvesely, hiraditya, asbirlea, llvm-commits, yaxunl

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62342

llvm-svn: 361777
 		2019-05-27 18:26:29 +00:00
clang [clang] Respect TerseOutput when printing lambdas 2019-05-27 16:20:45 +00:00
clang-tools-extra [clang-tidy] Fix unused-variable warning after r361647. 2019-05-27 08:09:02 +00:00
compiler-rt [libFuzzer] when using data-flow-trace (DFT) only load the DFT for the files present in the corpus 2019-05-24 00:43:52 +00:00
debuginfo-tests Set config.lit_tools_dir, which is needed by lit.llvm.initialize. 2018-11-06 21:54:27 +00:00
libclc travis: Add LLVM-8 build 2019-03-27 21:28:31 +00:00
libcxx fix test for older clang versions 2019-05-24 03:15:32 +00:00
libcxxabi [runtimes] Move libunwind, libc++abi and libc++ to lib/$target/c++ and include/c++ 2019-05-22 21:08:33 +00:00
libunwind [runtimes] Move libunwind, libc++abi and libc++ to lib/$target/c++ and include/c++ 2019-05-22 21:08:33 +00:00
lld Remove elf::createSharedFile and move its code to SharedFile's ctor. NFC. 2019-05-27 07:26:13 +00:00
lldb DWARFDebugArangeSet: Remove references to SymbolFileDWARF 2019-05-27 14:16:15 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [SelectionDAG] Enhance the simplification of `copyto` from `implicit-def`. 2019-05-27 18:26:29 +00:00
openmp Revert "[OPENMP][NVPTX]Fix barriers and parallel level counters, NFC." 2019-05-24 14:06:47 +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 [DeLICM] Use polly::singleton to allow empty result. 2019-05-21 19:18:26 +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.