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Craig Topper 17fa42a69b [X86] Preserve undef information when creating a punpckl/hbw from a v16i8 where all the even or odd elements are undef. 
Previously if V2 was unused we ended up using V1 for both inputs as part of the code that follows the new code. By using lowerVectorShuffleWithUNPCK we keep the undef nature of V2 in the output.

As near as I can tell this makes v16i8 behavior consistent with every other VT now.

This does mean that we give the register allocator freedom to fill in random registers now and create false dependencies. But like I said we're already doing that for other types.

llvm-svn: 347296
 		2018-11-20 09:04:01 +00:00
clang Use is.constant intrinsic for __builtin_constant_p 2018-11-20 08:53:30 +00:00
clang-tools-extra Address comments. 2018-11-19 18:06:36 +00:00
compiler-rt [XRay] Add a test for allocator exhaustion 2018-11-20 03:56:04 +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 r600: Add datalayout to image builtin implementation 2018-11-10 21:43:40 +00:00
libcxx [NFC][libcxx] Fix incorrect comments 2018-11-19 22:06:42 +00:00
libcxxabi [CMake] Passthrough CFLAGS when checking the compiler-rt path 2018-11-14 00:09:26 +00:00
libunwind [CMake] Passthrough CFLAGS when checking the compiler-rt path 2018-11-14 00:09:26 +00:00
lld [WebAssembly] Fix inaccurate comments / assertion messages 2018-11-19 23:31:28 +00:00
lldb Skip TestTargetCreateDeps 2018-11-20 01:18:49 +00:00
llgo Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm [X86] Preserve undef information when creating a punpckl/hbw from a v16i8 where all the even or odd elements are undef. 2018-11-20 09:04:01 +00:00
openmp Fix for bugzilla https://bugs.llvm.org/show_bug.cgi?id=39137. 2018-11-14 13:49:41 +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.