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Nemanja Ivanovic 2d39ad0c20 [PowerPC] Remove self-copies in pre-emit peephole 
There are occasionally instances where AADB rewrites registers in such a way
that a reg-reg copy becomes a self-copy. Such an instruction is obviously
redundant and can be removed. This patch does precisely that.

Note that this will not remove various nop's that we insert (which are
themselves just self-copies). The reason those are left alone is that all of
them have their own opcodes (that just encode to a self-copy).

What prompted this patch is the fact that these self-copies sometimes end up
using registers that make the instruction a priority-setting nop, thereby
having a significant effect on performance.

Differential revision: https://reviews.llvm.org/D52432

llvm-svn: 344036
2018-10-09 10:54:04 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings [bindings/go] Add Go bindings to the Token type 2018-09-28 17:39:59 +00:00
cmake [cmake] Also create lowercase extension WinSDK symlinks 2018-10-05 00:08:27 +00:00
docs [doc] Update the programmer's manual about SmallSet's iterator 2018-10-04 12:33:33 +00:00
examples [ORC] Fix BuildingAJIT tutorial examples that were broken by r343059. 2018-09-26 04:00:58 +00:00
include [ADT] Force the alignment of the data field of IntervalMap 2018-10-09 08:50:50 +00:00
lib [PowerPC] Remove self-copies in pre-emit peephole 2018-10-09 10:54:04 +00:00
projects [cmake] Support moving debuginfo-tests to llvm/projects 2017-12-12 17:06:08 +00:00
resources
runtimes Revert "[CMake] Pass Clang defaults to runtimes builds" 2018-07-13 20:01:55 +00:00
test [PowerPC] Remove self-copies in pre-emit peephole 2018-10-09 10:54:04 +00:00
tools [llvm-exegesis] Fix wrong index type. 2018-10-09 10:06:19 +00:00
unittests [IRBuilder] Fixup CreateIntrinsic to allow specifying Types to Mangle. 2018-10-08 10:32:33 +00:00
utils TableGen/CodeGenDAGPatterns: addPredicateFn only once 2018-10-08 16:53:31 +00:00
.arcconfig [llvm] Set up .arcconfig to point to Diffusion L repository 2018-01-12 15:37:41 +00:00
.clang-format
.clang-tidy
.gitattributes [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
.gitignore
CMakeLists.txt [WebAssembly] Add WebAssembly to LLVM_ALL_TARGETS 2018-10-03 23:56:52 +00:00
CODE_OWNERS.TXT Add owner for llvm-objcopy 2018-08-09 22:05:19 +00:00
configure
CREDITS.TXT Update my information in the CREDITS file. 2018-06-15 20:02:11 +00:00
LICENSE.TXT Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Test commit. 2018-09-22 01:01:03 +00:00
RELEASE_TESTERS.TXT Remove myself from the release testers list. (NFC) 2018-06-20 21:25:50 +00:00

README.txt 

The LLVM Compiler Infrastructure
================================

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LLVM is open source software. You may freely distribute it under the terms of
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Please see the documentation provided in docs/ for further
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