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Sanjay Patel 6b40768f5a [x86] commute blendvb with constant condition op to allow load folding 
This is a narrow fix for 1 of the problems mentioned in PR27780:
https://bugs.llvm.org/show_bug.cgi?id=27780

I looked at more general solutions, but it's a mess. We canonicalize shuffle masks
based on the number of elements accessed from each operand, and that's not optional.
If you remove that, we'll crash because we fail to match isel patterns. So I'm
waiting until we're sure that we have blendvb with constant condition and then
commuting based on the load potential. Other cases like blend-with-immediate are
already handled elsewhere, so this is probably not a common problem anyway.

I didn't use "MayFoldLoad" because that checks for one-use and in these cases, we've
screwed that up by creating a temporary PSHUFB using these operands that we're counting
on to be killed later. Undoing that didn't look like a simple task because it's
intertwined with determining if we actually use both operands of the shuffle or not.a

Differential Revision: https://reviews.llvm.org/D53737

llvm-svn: 345390
 		2018-10-26 14:58:13 +00:00
clang Revert r345330 "Add MS ABI mangling for operator<=>." 2018-10-26 13:05:45 +00:00
clang-tools-extra [clang-tidy] Re-commit: Add new 'readability-uppercase-literal-suffix' check (CERT DCL16-C, MISRA C:2012, 7.3, MISRA C++:2008, 2-13-4) 2018-10-26 13:09:27 +00:00
compiler-rt [sanitizer] Fix mallopt interceptor. 2018-10-25 22:15:44 +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 Run the min/max tests agaist the header <charconv>. Fix that header so it passes. NFC. 2018-10-26 01:00:56 +00:00
libcxxabi cxa_demangle: make demangler's parsing functions overridable 2018-10-16 14:29:14 +00:00
libunwind [CMake] Link to compiler-rt if LIBUNWIND_USE_COMPILER_RT is ON. 2018-10-08 18:35:00 +00:00
lld [ELF] Add --{,no-}call-graph-profile-sort (enabled by default) 2018-10-25 23:15:23 +00:00
lldb [Windows] Define generic arguments registers for Windows x64 2018-10-26 14:15:34 +00:00
llgo Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm [x86] commute blendvb with constant condition op to allow load folding 2018-10-26 14:58:13 +00:00
openmp remove duplicate omp_control_tool export to fix windows build 2018-10-25 11:04:01 +00:00
parallel-libs Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
polly [TI removal] Generically discuss terminators rather than use the soon to 2018-10-18 07:43:30 +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.