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9e1f653e2f
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David Majnemer 9e1f653e2f LICM: Don't crash when an instruction is used by an unreachable BB 
Summary:
BBs might contain non-LCSSA'd values after the LCSSA pass is run if they
are unreachable from the entry block.

Normally, the users of the instruction would be PHIs but the unreachable
BBs have normal users; rewrite their uses to be undef values.

An alternative fix could involve fixing this at LCSSA but that would
require this invariant to hold after subsequent transforms.  If a BB
created an unreachable block, they would be in violation of this.

This fixes PR19798.

Differential Revision: http://reviews.llvm.org/D5146

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216911 91177308-0d34-0410-b5e6-96231b3b80d8
2014-09-02 16:22:00 +00:00
autoconf Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
bindings [OCaml] Expose Llvm.get_operand_use. 2014-08-12 02:55:45 +00:00
cmake Introduce -DLLVM_USE_SANITIZER=Undefined CMake option to build UBSan-ified version of LLVM/Clang. 2014-08-29 00:50:36 +00:00
docs Fix typos in comments, NFC 2014-08-29 21:53:01 +00:00
examples Modernize raw_fd_ostream's constructor a bit. 2014-08-25 18:16:47 +00:00
include Replace -use-init-array with -use-ctors. 2014-09-02 13:54:53 +00:00
lib LICM: Don't crash when an instruction is used by an unreachable BB 2014-09-02 16:22:00 +00:00
projects [cmake] Use the external project machinery for libcxxabi so that it can 2014-07-25 10:27:40 +00:00
test LICM: Don't crash when an instruction is used by an unreachable BB 2014-09-02 16:22:00 +00:00
tools Teach llvm-bcanalyzer to use one stream's BLOCKINFO to read another stream. 2014-08-30 17:07:55 +00:00
unittests Add some negative (and positive) static_assert checks for ArrayRef-of-pointer conversions introduced in r216709 2014-08-31 01:33:41 +00:00
utils Fix typos in comments, NFC 2014-08-29 21:53:01 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format
.gitignore Add Polly to the ignored trees. 2014-06-25 13:13:36 +00:00
CMakeLists.txt Fix building with in-tree libc++abi on FreeBSD 2014-08-01 19:23:15 +00:00
CODE_OWNERS.TXT Add a sentence that all entries should include an email address. 2014-08-04 19:33:25 +00:00
configure Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in Track clang r213171 2014-07-16 16:50:34 +00:00
Makefile.rules Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

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