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Mehdi Amini eabbdab4f5 [Scalarizer] PR28108: Skip over nullptr rather than crashing on it. 
Summary:
In Scalarizer::gather we see if we already have a scattered form of Op,
and in that case use the new form.

In the particular case of PR28108, the found ValueVector SV has size 2,
where the first Value is nullptr, and the second is indeed a proper Value.
The nullptr then caused an assert to blow when we tried to do
cast<Instruction>(SV[I]).

With this patch we check SV[I] before doing the cast, and if it's nullptr
we just skip over it.

I don't know the Scalarizer well enough to know if this is the best fix
or if something should be done else where to prevent the nullptr from
being in the ValueVector at all, but at least this avoids the crash
and looking at the test case output it looks reasonable.

Reviewers: hfinkel, frasercrmck, wala, mehdi_amini

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D21518

llvm-svn: 275359
2016-07-14 01:31:25 +00:00
bindings [OCaml] Add functions for accessing metadata nodes. 2016-06-22 03:30:24 +00:00
cmake [cmake] Create the LLVM_BUILD_UTILS option. 2016-07-10 02:43:47 +00:00
docs Synchronize LLVM and clang's ObjCDeclSpec::ObjCPropertyAttributeKind. 2016-07-14 00:41:18 +00:00
examples New Kaleidoscope chapter: Creating object files 2016-07-02 17:01:59 +00:00
include Synchronize LLVM and clang's ObjCDeclSpec::ObjCPropertyAttributeKind. 2016-07-14 00:41:18 +00:00
lib [Scalarizer] PR28108: Skip over nullptr rather than crashing on it. 2016-07-14 01:31:25 +00:00
projects Remove autoconf support 2016-01-26 21:29:08 +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] Add LLVM runtimes directory 2016-06-23 22:07:21 +00:00
test [Scalarizer] PR28108: Skip over nullptr rather than crashing on it. 2016-07-14 01:31:25 +00:00
tools [Object] Revert r275316, Archive::child_iterator changes, while I update lld. 2016-07-14 00:37:04 +00:00
unittests Fix header comment in unittests/CodeGen/DIEHashTest.cpp. 2016-07-13 18:38:20 +00:00
utils vim: separate the keywords into one per line 2016-07-13 03:47:58 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy Don't use misc-unused-parameters check on LLVM. 2016-04-13 08:58:52 +00:00
.gitignore [CMake] Add LLVM runtimes directory 2016-06-23 22:07:21 +00:00
CMakeLists.txt [cmake] Create the LLVM_BUILD_UTILS option. 2016-07-10 02:43:47 +00:00
CODE_OWNERS.TXT Transfer ownership of the gold plugin. 2016-07-05 20:49:50 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT Update my email address. 2016-05-10 16:23:54 +00:00
LICENSE.TXT Update copyright year to 2016. 2016-03-30 22:41:06 +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 Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
README.txt Revert previous test commit. 2016-01-04 19:13:29 +00:00

README.txt 

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

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Please see the documentation provided in docs/ for further
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