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Bjorn Pettersson c2fc53ac90 [PHIElimination] Lower a PHI node with only undef uses as IMPLICIT_DEF
Summary:
The lowering of PHI nodes used to detect if all inputs originated
from IMPLICIT_DEF's. If so the PHI node was replaced by an
IMPLICIT_DEF. Now we also consider undef uses when checking the
inputs. So if all inputs are implicitly defined or undef we
lower the PHI to an IMPLICIT_DEF. This makes
PHIElimination::LowerPHINode more consistent as it checks
both implicit and undef properties at later stages.

Reviewers: MatzeB, tstellar

Reviewed By: MatzeB

Subscribers: jvesely, nhaehnle, llvm-commits

Differential Revision: https://reviews.llvm.org/D52558

llvm-svn: 343417
2018-09-30 17:26:58 +00:00
clang Update ifunc attribute support documentation 2018-09-30 15:08:18 +00:00
clang-tools-extra Allow clang-tidy to be built without a dependency on the clang static analyzer. 2018-09-30 17:22:58 +00:00
compiler-rt Switch sanitizer_procmaps_bsd to internal_sysctl 2018-09-29 07:45:03 +00:00
debuginfo-tests Revert "(Retry) Add a basic integration test for C++ smart pointers" 2018-08-20 19:53:33 +00:00
libclc configure: Rework support for gfx9+ devices that were added post LLVM 3.9 2018-09-15 22:02:01 +00:00
libcxx [cxx2a] Fix warning triggered by r343285 2018-09-29 02:17:12 +00:00
libcxxabi Update docs to reference new libc++ mailing lists. 2018-09-22 19:52:12 +00:00
libunwind Reverting r342895 2018-09-24 16:36:33 +00:00
lld [LLD][COFF] Fix pdb loading when the path points to a removable device 2018-09-28 21:53:40 +00:00
lldb Fix NetBSD build for r343409 2018-09-30 16:12:09 +00:00
llgo Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm [PHIElimination] Lower a PHI node with only undef uses as IMPLICIT_DEF 2018-09-30 17:26:58 +00:00
openmp [libomptarget-nvptx] Align data sharing stack 2018-09-30 09:23:21 +00:00
parallel-libs Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
polly [IslAst] Fix InParallelFor nesting. 2018-09-27 13:39:37 +00:00
README.md

README.md

Low Level Virtual Machine (LLVM)

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