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Drew Wock 161d927dda [SeparateConstOffsetFromGEP] Fix: sext(a) + sext(b) -> sext(a + b) matches add and sub instructions with one another 
During the SeparateConstOffsetFromGEP pass, signed extensions are distributed
to the values that feed into them and then later recombined. The recombination
stage is somewhat problematic- it doesn't differ add and sub instructions
from another when matching the sext(a) +/- sext(b) -> sext(a +/- b) pattern
in some instances.

An example- the IR contains:
%unextendedA
%unextendedB
%subuAuB = unextendedA - unextendedB
%extA = extend A
%extB = extend B
%addeAeB = extA + extB

The problematic optimization will transform that into:

%unextendedA
%unextendedB
%subuAuB = unextendedA - unextendedB
%extA = extend A
%extB = extend B
%addeAeB = extend subuAuB ; Obviously not semantically equivalent to the IR input.

This patch fixes that.

Patch by Drew Wock <drew.wock@sas.com>
Differential Revision: https://reviews.llvm.org/D65967
2020-01-17 12:22:52 -05:00
benchmarks
bindings [NFC] Fix trivial typos in comments 2020-01-06 10:50:26 +00:00
cmake Make LLVM_APPEND_VC_REV=OFF affect clang, lld, and lldb as well. 2020-01-16 19:04:08 -05:00
docs [docs][ORC] Try to fix 'title-level inconsistent' error in ORCv2.rst. 2020-01-16 21:46:35 -08:00
examples [ORC] Simplify use of lazyReexports with LLJIT. 2020-01-15 08:02:53 -08:00
include Revert rGb6437b352db9 - "Fix gcc9 "moving a local object in a return statement prevents copy elision" Wpessimizing-move warnings." 2020-01-17 16:04:10 +00:00
lib [SeparateConstOffsetFromGEP] Fix: sext(a) + sext(b) -> sext(a + b) matches add and sub instructions with one another 2020-01-17 12:22:52 -05:00
projects Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
resources
runtimes [llvm/runtimes] Add runtimes as a dependency of clang-bootstrap-deps 2019-12-16 16:58:15 -08:00
test [SeparateConstOffsetFromGEP] Fix: sext(a) + sext(b) -> sext(a + b) matches add and sub instructions with one another 2020-01-17 12:22:52 -05:00
tools [llvm-exegesis][mips] Add support for memory instructions 2020-01-17 13:26:09 +01:00
unittests [IR] fix Constant::isElementWiseEqual() to allow for all undef elements compare 2020-01-17 08:31:16 -05:00
utils [gn build] Port 42a0355816d 2020-01-17 13:44:44 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore
CMakeLists.txt Bump the trunk major version to 11 2020-01-15 13:38:01 +01:00
CODE_OWNERS.TXT [VE] Target stub for NEC SX-Aurora 2020-01-09 11:17:35 +01:00
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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Please see the documentation provided in docs/ for further
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