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Artur Pilipenko f5935363ed Rework loop predication pass 
We've found a serious issue with the current implementation of loop predication.
The current implementation relies on SCEV and this turned out to be problematic.
To fix the problem we had to rework the pass substantially. We have had the
reworked implementation in our downstream tree for a while. This is the initial
patch of the series of changes to upstream the new implementation.

For now the transformation is limited to the following case:
  * The loop has a single latch with either ult or slt icmp condition.
  * The step of the IV used in the latch condition is 1.
  * The IV of the latch condition is the same as the post increment IV of the guard condition.
  * The guard condition is ult.

See the review or the LoopPredication.cpp header for the details about the
problem and the new implementation.

Reviewed By: sanjoy, mkazantsev

Differential Revision: https://reviews.llvm.org/D37569

llvm-svn: 313981
2017-09-22 13:13:57 +00:00
bindings Update the Go bindings for r309426 (remove offset from llvm.dbg.value) 2017-07-28 22:44:44 +00:00
cmake [lit] Add a test for the builtin config map. 2017-09-21 16:18:28 +00:00
docs Re-land r313825: "[IR] Add llvm.dbg.addr, a control-dependent version of llvm.dbg.declare" 2017-09-21 19:52:03 +00:00
examples Fix broken links to the Itanium CXX ABI 2017-09-12 00:19:11 +00:00
include Rename markAsErased to erase, as pointed out in a previous review; NFC 2017-09-22 01:47:41 +00:00
lib Rework loop predication pass 2017-09-22 13:13:57 +00:00
projects Add temporary workaround to allow in-tree libc++ builds on Windows 2017-05-11 01:44:30 +00:00
resources
runtimes [CMake][runtimes] Use the same configuration for non-target and "default" target 2017-09-08 22:26:50 +00:00
test Rework loop predication pass 2017-09-22 13:13:57 +00:00
tools [dwarfdump] Fix ambiguous call to make_unique 2017-09-22 09:38:52 +00:00
unittests Rename markAsErased to erase, as pointed out in a previous review; NFC 2017-09-22 01:47:41 +00:00
utils Resubmit "[lit] Refactor out some more common lit configuration code." 2017-09-21 22:16:40 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitignore gitignore: Ignore .vs folder (VS2017 config files) 2017-04-08 00:16:58 +00:00
CMakeLists.txt [cmake] Add an option to build llvm with IR PGO 2017-09-20 17:16:01 +00:00
CODE_OWNERS.TXT [ARC] Add ARC backend. 2017-08-24 15:40:33 +00:00
configure
CREDITS.TXT Add myself to CREDITS.txt 2017-09-18 14:33:39 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Test commit access 2017-08-18 02:39:28 +00:00
RELEASE_TESTERS.TXT [RelTest] Diana is doing both releases now 2017-07-14 08:33:52 +00:00

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