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Duncan P. N. Exon Smith 701b7a130a CodeGen: Give MachineBasicBlock::reverse_iterator a handle to the current MI 
Now that MachineBasicBlock::reverse_instr_iterator knows when it's at
the end (since r281168 and r281170), implement
MachineBasicBlock::reverse_iterator directly on top of an
ilist::reverse_iterator by adding an IsReverse template parameter to
MachineInstrBundleIterator.  This replaces another hard-to-reason-about
use of std::reverse_iterator on list iterators, matching the changes for
ilist::reverse_iterator from r280032 (see the "out of scope" section at
the end of that commit message).  MachineBasicBlock::reverse_iterator
now has a handle to the current node and has obvious invalidation
semantics.

r280032 has a more detailed explanation of how list-style reverse
iterators (invalidated when the pointed-at node is deleted) are
different from vector-style reverse iterators like std::reverse_iterator
(invalidated on every operation).  A great motivating example is this
commit's changes to lib/CodeGen/DeadMachineInstructionElim.cpp.

Note: If your out-of-tree backend deletes instructions while iterating
on a MachineBasicBlock::reverse_iterator or converts between
MachineBasicBlock::iterator and MachineBasicBlock::reverse_iterator,
you'll need to update your code in similar ways to r280032.  The
following table might help:

                  [Old]              ==>             [New]
        delete &*RI, RE = end()                   delete &*RI++
        RI->erase(), RE = end()                   RI++->erase()
      reverse_iterator(I)                 std::prev(I).getReverse()
      reverse_iterator(I)                          ++I.getReverse()
    --reverse_iterator(I)                            I.getReverse()
      reverse_iterator(std::next(I))                 I.getReverse()
                RI.base()                std::prev(RI).getReverse()
                RI.base()                         ++RI.getReverse()
              --RI.base()                           RI.getReverse()
     std::next(RI).base()                           RI.getReverse()

(For more details, have a look at r280032.)

llvm-svn: 281172
2016-09-11 18:51:28 +00:00
bindings Formatting with clang-format patch r280700 2016-09-06 17:03:02 +00:00
cmake [cmake] Fix a stale comment from an earlier version of r281085. NFC. 2016-09-09 19:48:22 +00:00
docs It should also be legal to pass a swifterror parameter to a call as a swifterror 2016-09-10 19:42:53 +00:00
examples Fix singlton -> singleton typo. 2016-08-26 02:00:21 +00:00
include CodeGen: Give MachineBasicBlock::reverse_iterator a handle to the current MI 2016-09-11 18:51:28 +00:00
lib CodeGen: Give MachineBasicBlock::reverse_iterator a handle to the current MI 2016-09-11 18:51:28 +00:00
projects Enable in-tree builds of parallel-libs. 2016-09-09 21:34:12 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes [CMake] Connecting check-all and test-depends targets correctly 2016-09-01 18:26:01 +00:00
test Fixup failing debuginfo test for change in SimplifyCFG. 2016-09-11 09:13:32 +00:00
tools [ORC] Rename RPCChannel to RPCByteChannel. NFC. 2016-09-11 18:41:05 +00:00
unittests CodeGen: Give MachineBasicBlock::reverse_iterator a handle to the current MI 2016-09-11 18:51:28 +00:00
utils [cmake] Export gtest/gtest_main and its dependencies via a special build tree only cmake exports file. 2016-09-09 19:45:34 +00:00
.arcconfig Upgrade all the .arcconfigs to https. 2016-07-14 13:15:37 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy .clang-tidy: parameters and members should be CamelCased. 2016-09-08 23:29:37 +00:00
.gitignore gitignore: ignore VS Code editor files 2016-09-02 22:54:26 +00:00
CMakeLists.txt Try to fix a circular dependency in the modules build. 2016-09-06 20:16:19 +00:00
CODE_OWNERS.TXT CODE_OWNERS: bring my entry up to date 2016-09-05 17:42:46 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Shamelessly add myself to CREDITS.TXT 2016-08-04 16:28:22 +00:00
LICENSE.TXT Remove autoconf references from LICENSE.TXT 2016-08-12 20:11:03 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt
README.txt Revert rL277454 2016-08-02 13:26:07 +00:00
RELEASE_TESTERS.TXT Adding RELEASE_TESTERS.TXT 2016-07-21 16:46:44 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

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LLVM is open source software. You may freely distribute it under the terms of
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Please see the documentation provided in docs/ for further
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If you are writing a package for LLVM, see docs/Packaging.rst for our
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