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Brian M. Rzycki d989af98b3 [JumpThreading] Preservation of DT and LVI across the pass 
Summary:
See D37528 for a previous (non-deferred) version of this
patch and its description.

Preserves dominance in a deferred manner using a new class
DeferredDominance. This reduces the performance impact of
updating the DominatorTree at every edge insertion and
deletion. A user may call DDT->flush() within JumpThreading
for an up-to-date DT. This patch currently has one flush()
at the end of runImpl() to ensure DT is preserved across
the pass.

LVI is also preserved to help subsequent passes such as
CorrelatedValuePropagation. LVI is simpler to maintain and
is done immediately (not deferred). The code to perfom the
preversation was minimally altered and was simply marked
as preserved for the PassManager to be informed.

This extends the analysis available to JumpThreading for
future enhancements. One example is loop boundary threading.

Reviewers: dberlin, kuhar, sebpop

Reviewed By: kuhar, sebpop

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D40146

llvm-svn: 320612
 		2017-12-13 20:52:26 +00:00
clang [Hexagon] Intrinsic support for V62 and V65 2017-12-13 19:56:03 +00:00
clang-tools-extra [clangd] Fix bool conversion operator of UniqueFunction 2017-12-13 15:42:59 +00:00
compiler-rt [scudo] Adding a public Scudo interface 2017-12-13 20:41:35 +00:00
debuginfo-tests [debuginfo-tests] Support moving debuginfo-tests to llvm/projects 2017-12-12 16:54:20 +00:00
libclc configure.py: Add gfx900 (Vega, Raven) 2017-11-27 11:14:06 +00:00
libcxx [libcxx] Fix basic_stringbuf constructor 2017-12-13 18:12:55 +00:00
libcxxabi [libcxxabi] Pass LIBCXXABI_SYSROOT and LIBCXXABI_GCC_TOOLCHAIN to lit 2017-12-12 01:20:37 +00:00
libunwind [libunwind][MIPS]: Add support for unwinding in O32 and N64 processes. 2017-12-12 21:43:36 +00:00
lld Add missing reference to lldCommon in MinGW/CMakeLists.txt 2017-12-13 20:39:02 +00:00
lldb [IRExecutionUnit] Initialize uninititialized member variable. 2017-12-13 01:41:17 +00:00
llgo irgen: Create functions instead of global variables for builtin hash and equal algorithms. 2017-06-04 22:11:28 +00:00
llvm [JumpThreading] Preservation of DT and LVI across the pass 2017-12-13 20:52:26 +00:00
openmp [AArch64] fix an issue with older /proc/cpuinfo layout 2017-12-13 16:12:24 +00:00
parallel-libs [Axccel] Remove -Wno-missing-braces in build 2016-12-19 21:34:07 +00:00
polly [ScopBuilder] Split statements on encountering store instructions. 2017-12-11 12:51:24 +00:00
README.md Add an svn project to contain the files that appear at the root of the 2017-10-19 21:09:49 +00:00

README.md

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.