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Arnold Schwaighofer 3036182e99 BasicAA: Use reachabilty instead of dominance for checking value equality in phi 
cycles

This allows the value equality check to work even if we don't have a dominator
tree. Also add some more comments.

I was worried about compile time impacts and did not implement reachability but
used the dominance check in the initial patch. The trade-off was that the
dominator tree was required.
The llvm utility function isPotentiallyReachable cuts off the recursive search
after 32 visits. Testing did not show any compile time regressions showing my
worries unjustfied.

No compile time or performance regressions at O3 -flto -mavx on test-suite +
externals.

Addresses review comments from r198290.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198400 91177308-0d34-0410-b5e6-96231b3b80d8
2014-01-03 05:47:03 +00:00
autoconf Update the copyright credits -- Happy new year 2014! 2014-01-01 08:27:31 +00:00
bindings Makefile.ocaml: Tweak to use --system-libs. 2013-12-20 00:36:59 +00:00
cmake [CMake] Add missing set_output_directory after Takumi's change in r198205. 2014-01-02 19:47:45 +00:00
docs Remove the 's' DataLayout specification 2014-01-01 22:29:43 +00:00
examples
include Enable LLVM_FINAL, LLVM_OVERRIDE and LLVM_HAS_VARIADIC_TEMPLATES with more gcc and MSVC versions 2014-01-03 05:00:46 +00:00
lib BasicAA: Use reachabilty instead of dominance for checking value equality in phi 2014-01-03 05:47:03 +00:00
projects
test BasicAA: Use reachabilty instead of dominance for checking value equality in phi 2014-01-03 05:47:03 +00:00
tools Port r198087 and r198089 (strip dead code by default) from make to cmake. 2013-12-30 03:36:05 +00:00
unittests Fix break introduced in r198377 due to using a local type as a template parameter. 2014-01-03 00:00:41 +00:00
utils [TableGen] Handle ValueType in CodeGenDAGPatterns GetNumNodeResults 2014-01-02 20:47:05 +00:00
.arcconfig
.clang-format
.gitignore
CMakeLists.txt [CMake][VS][XCode] Restruct the output directory layout more comfortable, ${BINARY_DIR}/${BUILD_MODE}/(bin|lib) 2013-12-30 06:48:30 +00:00
CODE_OWNERS.TXT
configure Update the copyright credits -- Happy new year 2014! 2014-01-01 08:27:31 +00:00
CREDITS.TXT Fix documentation typos 2013-12-20 00:33:39 +00:00
LICENSE.TXT Update the copyright credits -- Happy new year 2014! 2014-01-01 08:27:31 +00:00
llvm.spec.in
LLVMBuild.txt
Makefile llvm-config: Fixup r197380, tweak for cross compilation. SYSTEM_LIBS should be --host's in BuildTools/llvm-config. 2013-12-16 13:09:06 +00:00
Makefile.common
Makefile.config.in
Makefile.rules Strip dead code when linking by default with BFD ld (linux, ...) and ld64 (os x). 2013-12-27 22:38:59 +00:00
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