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LLVM backend for 6502
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8615ab4a4a
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Chandler Carruth 8615ab4a4a [LPM] Switch LICM to actively use LCSSA in addition to preserving it. 
Fixes PR18753 and PR18782.

This is necessary for LICM to preserve LCSSA correctly and efficiently.
There is still some active discussion about whether we should be using
LCSSA, but we can't just immediately stop using it and we *need* LICM to
preserve it while we are using it. We can restore the old SSAUpdater
driven code if and when there is a serious effort to remove the reliance
on LCSSA from all of the loop passes.

However, this also serves as a great example of why LCSSA is very nice
to have. This change significantly simplifies the process of sinking
instructions for LICM, and makes it quite a bit less expensive.

It wouldn't even be as complex as it is except that I had to start the
process of removing the big recursive LCSSA formation hammer in order to
switch even this much of the re-forming code to asserting that LCSSA was
preserved. I'll fully remove that next just to tidy things up until the
LCSSA debate settles one way or the other.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201148 91177308-0d34-0410-b5e6-96231b3b80d8
2014-02-11 12:52:27 +00:00
autoconf Add version, arch, system libs, and targets to Makefile.config 2014-02-09 16:36:42 +00:00
bindings
cmake cmake: Do not export targets when installing toolchain only 2014-02-10 20:44:57 +00:00
docs [docs] [tblgen] clarify that code fragments are just string literals 2014-02-09 02:54:26 +00:00
examples
include Remove TimeValue::toPosixTime() -- it is buggy, semantics are unclear, and its 2014-02-11 09:11:18 +00:00
lib [LPM] Switch LICM to actively use LCSSA in addition to preserving it. 2014-02-11 12:52:27 +00:00
projects llvm/projects/CMakeLists.txt: Add dragonegg. 2014-01-24 12:53:08 +00:00
test [LPM] Switch LICM to actively use LCSSA in addition to preserving it. 2014-02-11 12:52:27 +00:00
tools Move the *PassPrinter into their own module. 2014-02-10 23:34:23 +00:00
unittests Remove TimeValue::toPosixTime() -- it is buggy, semantics are unclear, and its 2014-02-11 09:11:18 +00:00
utils [CMake] Add dependencies to gtest. 2014-02-10 11:27:41 +00:00
.arcconfig
.clang-format
.gitignore Added .DS_Store entry in .gitignore for ignoring .DS_Store files in the source 2014-01-25 15:15:16 +00:00
CMakeLists.txt Fix LLVM install rules to not set permissions on include/ 2014-02-10 10:50:55 +00:00
CODE_OWNERS.TXT
configure Add version, arch, system libs, and targets to Makefile.config 2014-02-09 16:36:42 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile Provide CMake package modules in install tree 2014-02-09 16:37:02 +00:00
Makefile.common
Makefile.config.in Add version, arch, system libs, and targets to Makefile.config 2014-02-09 16:36:42 +00:00
Makefile.rules Provide CMake package modules in install tree 2014-02-09 16:37:02 +00:00
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