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Simon Pilgrim 6c95bea072 [TargetLowering] Fix propagation of undefs in zero extension ops (PR40091) 
As described on PR40091, we have several places where zext (and zext_vector_inreg) fold an undef input into an undef output. For zero extensions this is incorrect as the output should guarantee to least have the new upper bits set to zero.

SimplifyDemandedVectorElts is the worst offender (and its the most likely to cause new undefs to appear) but DAGCombiner's tryToFoldExtendOfConstant has a similar issue.

Thanks to @dmgreen for catching this.

Differential Revision: https://reviews.llvm.org/D55883

llvm-svn: 349625
 		2018-12-19 13:37:59 +00:00
clang Use "EvaluateAsRValue" instead of as a known int, because if it's not a known 2018-12-19 04:54:29 +00:00
clang-tools-extra [clang-tidy] use "const SourceManager&" parameter, NFC. 2018-12-19 13:25:08 +00:00
compiler-rt Reimplement Thread Static Data ASan routines with TLS 2018-12-19 11:11:29 +00:00
debuginfo-tests Set config.lit_tools_dir, which is needed by lit.llvm.initialize. 2018-11-06 21:54:27 +00:00
libclc travis: Add cmake build 2018-11-27 16:07:21 +00:00
libcxx Portability fix: add missing includes and static_casts. Reviewed as https://reviews.llvm.org/D55777. Thanks to Andrey Maksimov for the patch. 2018-12-18 23:19:00 +00:00
libcxxabi [libcxx] Remove bad_array_length 2018-11-29 19:44:57 +00:00
libunwind [SEH] Add initial support for AArch64 2018-12-18 20:05:59 +00:00
lld [LLD][ELF] - Report a location for symbols from the linker script when reporting an error. 2018-12-19 10:19:40 +00:00
lldb refactor testsuite spawnLldbMi args->exe+args 2018-12-19 08:57:10 +00:00
llgo Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm [TargetLowering] Fix propagation of undefs in zero extension ops (PR40091) 2018-12-19 13:37:59 +00:00
openmp [Tests] [OpenMP] XFAIL also for ppc64le. 2018-12-18 19:05:07 +00:00
parallel-libs Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
polly [CMake] Fix generation of exported targets in build directory 2018-11-06 15:18:17 +00:00
README.md Update the project name in README.md 2018-10-19 00:03:01 +00:00

README.md

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.