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4271526a2f
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Florian Hahn 4271526a2f [ValueLattice] Add new state for undef constants. 
This patch adds a new undef lattice state, which is used to represent
UndefValue constants or instructions producing undef.

The main difference to the unknown state is that merging undef values
with constants (or single element constant ranges) produces  the
constant/constant range, assuming all uses of the merge result will be
replaced by the found constant.

Contrary, merging non-single element ranges with undef needs to go to
overdefined. Using unknown for UndefValues currently causes mis-compiles
in CVP/LVI (PR44949) and will become problematic once we use
ValueLatticeElement for SCCP.

Reviewers: efriedma, reames, davide, nikic

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D75120
2020-03-14 17:19:59 +00:00
benchmarks
bindings Add an SDK attribute to DICompileUnit 2020-03-11 14:14:06 -07:00
cmake CMake: Turn LLVM_ENABLE_ZLIB into a tri-state option 2020-03-13 13:52:46 -07:00
docs Add support for SHA256 source file checksums in debug info 2020-03-12 16:32:05 -07:00
examples Add missing "llvm/Support/Host.h" header to LLVM example after recent header trimming (NFC) 2020-03-12 00:12:03 +00:00
include [ValueLattice] Add new state for undef constants. 2020-03-14 17:19:59 +00:00
lib [ValueLattice] Add new state for undef constants. 2020-03-14 17:19:59 +00:00
projects Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
resources
runtimes [runtimes] When COMPILER_RT is enabled, consider SANITIZER prefixes 2020-03-11 14:22:20 -07:00
test [ValueLattice] Add new state for undef constants. 2020-03-14 17:19:59 +00:00
tools Fix -Wunused-variable. NFC. 2020-03-13 20:54:22 -04:00
unittests [AssumeBundles] filter usefull attriutes to preserve 2020-03-13 17:35:47 +01:00
utils [TableGen] Support combining AssemblerPredicates with ORs 2020-03-13 17:13:51 +00:00
.clang-format
.clang-tidy - Update .clang-tidy to ignore parameters of main like functions for naming violations in clang and llvm directory 2020-01-31 16:49:45 +00:00
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore Continue removing llgo. 2020-02-10 10:33:58 -08:00
CMakeLists.txt CMake: Turn LLVM_ENABLE_ZLIB into a tri-state option 2020-03-13 13:52:46 -07:00
CODE_OWNERS.TXT Remove myself from CODE_OWNERS. 2020-02-25 11:59:29 +00:00
configure
CREDITS.TXT Update email address. 2019-07-17 07:02:02 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Test commit. 2019-10-03 14:57:49 +00:00
RELEASE_TESTERS.TXT

README.txt 

The LLVM Compiler Infrastructure
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