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Serguei Katkov cde00c02e1 [Loop Peeling] Fix idom detection algorithm. 
We'd like to determine the idom of exit block after peeling one iteration.
Let Exit is exit block.
Let ExitingSet - is a set of predecessors of Exit block. They are exiting blocks.
Let Latch' and ExitingSet' are copies after a peeling.
We'd like to find an idom'(Exit) - idom of Exit after peeling.
It is an evident that idom'(Exit) will be the nearest common dominator of ExitingSet and ExitingSet'.
idom(Exit) is a nearest common dominator of ExitingSet.
idom(Exit)' is a nearest common dominator of ExitingSet'.
Taking into account that we have a single Latch, Latch' will dominate Header and idom(Exit).
So the idom'(Exit) is nearest common dominator of idom(Exit)' and Latch'.
All these basic blocks are in the same loop, so what we find is
(nearest common dominator of idom(Exit) and Latch)'.

Reviewers: reames, fhahn
Reviewed By: reames
Subscribers: hiraditya, zzheng, llvm-commits
Differential Revision: https://reviews.llvm.org/D65292

llvm-svn: 367044
 		2019-07-25 19:31:50 +00:00
clang CodeGen: ensure placeholder instruction for cleanup is created 2019-07-25 17:59:29 +00:00
clang-tools-extra [clangd] Fix the annotate tweak after rL366893 2019-07-25 08:48:05 +00:00
compiler-rt [sanitizer_common] Allow customization of StartSymbolizerSubprocess 2019-07-25 00:19:02 +00:00
debuginfo-tests Make nrvo-string test more robust. 2019-06-27 20:38:37 +00:00
libclc travis: Add LLVM-8 build 2019-03-27 21:28:31 +00:00
libcxx Implement change #4 of P1466: Change weekday to accept both 0 and 7 as Sunday. Add accessors 'c_encoding' and 'iso_encoding' to provide different interpretations of the weekday. Remove 'operator unsigned' 2019-07-25 03:26:05 +00:00
libcxxabi [runtimes] Don't depend on libpthread on Android 2019-07-22 20:41:03 +00:00
libunwind [runtimes] Don't depend on libpthread on Android 2019-07-22 20:41:03 +00:00
lld [ELF][MIPS] Improve tests 2019-07-25 07:12:23 +00:00
lldb Correctly use GetLoadedModuleList to take advantage of libraries-svr4 2019-07-25 14:28:21 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [Loop Peeling] Fix idom detection algorithm. 2019-07-25 19:31:50 +00:00
openmp [OpenMP] Fix build of stubs library, NFC. 2019-07-25 17:51:24 +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 [Polly] Clang complains about missing virtual destructor 2019-07-22 15:34:27 +00:00
pstl Revert "[libc++] Integrate the PSTL into libc++" 2019-07-19 18:52:46 +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.