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Mirror of https://github.com/RPCS3/llvm-mirror
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Nikita Popov 609bfedb6b [InstCombine] Handle known shl nsw sign bit in SimplifyDemanded 
Ideally SimplifyDemanded should compute the same known bits as
computeKnownBits(). This patch addresses one discrepancy, where
ValueTracking is more powerful: If we have a shl nsw shift, we
know that the sign bit of the input and output must be the same.
If this results in a conflict, the result is poison.

This is implemented in
2c4ca6832f/lib/Analysis/ValueTracking.cpp (L1175-L1179)
and
2c4ca6832f/lib/Analysis/ValueTracking.cpp (L904-L908).

This implements the same basic logic in SimplifyDemanded. It's
slightly stronger, because I return undef instead of zero for the
poison case (which is not an option inside ValueTracking).

As mentioned in https://reviews.llvm.org/D75801#inline-698484,
we could detect poison in more cases, this just establishes parity
with the existing logic.

Differential Revision: https://reviews.llvm.org/D76489
2020-03-20 18:16:05 +01:00
benchmarks
bindings Add an SDK attribute to DICompileUnit 2020-03-11 14:14:06 -07:00
cmake [CMake] Enable the use of -ffile-prefix-map 2020-03-19 15:14:15 -07:00
docs [CMake] Enable the use of -ffile-prefix-map 2020-03-19 15:14:15 -07:00
examples [ORC] Re-apply 98f2bb44610, enable JITEventListeners in OrcV2, with fixes. 2020-03-19 16:30:08 -07:00
include [InstCombine][X86] simplifyX86immShift - convert variable in-range vector shift by scalar amounts to generic shifts (PR40391) 2020-03-20 15:48:06 +00:00
lib [InstCombine] Handle known shl nsw sign bit in SimplifyDemanded 2020-03-20 18:16:05 +01:00
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 [InstCombine] Handle known shl nsw sign bit in SimplifyDemanded 2020-03-20 18:16:05 +01:00
tools [llvm-readobj] Allow syms from all sections to match stack size entries 2020-03-20 10:54:18 +00:00
unittests Revert "Cleanup the plumbing for DILineInfoSpecifier. [NFC]" 2020-03-19 17:25:05 -07:00
utils Revert "[TableGen][GlobalISel] Account for HwMode in RegisterBank register sizes" 2020-03-20 11:02:50 +01:00
.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 [ValueTypes] Add EVT::isFixedLengthVector 2020-03-19 10:08:17 +00:00
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. 2020-03-14 18:08:26 -07:00
RELEASE_TESTERS.TXT

README.txt 

The LLVM Compiler Infrastructure
================================

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
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started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.