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Craig Topper 7fddf2bfef [X86] Add an override of targetShrinkDemandedConstant to limit the damage that shrinkdemandedbits can do to zext_in_reg operations

Summary:
This patch adds an implementation of targetShrinkDemandedConstant that tries to keep shrinkdemandedbits from removing bits that would otherwise have been recognized as a movzx.

We still need a follow patch to stop moving ands across srl if the and could be represented as a movzx before the shift but not after. I think this should help with some of the cases that D42088 ended up removing during isel.

Reviewers: spatel, RKSimon

Reviewed By: spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D42265

llvm-svn: 323048

2018-01-20 18:50:09 +00:00

clang

[X86] Add rdpid command line option and intrinsics.

2018-01-20 18:36:52 +00:00

clang-tools-extra

Assume the shared library path variable is LD_LIBRARY_PATH on systems

2018-01-20 14:34:33 +00:00

compiler-rt

[compiler-rt] Implement __clear_cache() on OpenBSD/mips64

2018-01-20 14:16:16 +00:00

debuginfo-tests

[debuginfo-tests] Support moving debuginfo-tests to llvm/projects

2017-12-12 16:54:20 +00:00

libclc

tanpi: Port from amd_builtins

2018-01-19 18:57:22 +00:00

libcxx

More P0202 constexpr-ifying in <algorithm>. This commit handles replace/replace_if/replace_copy/replace_copy_if.

2018-01-19 18:07:29 +00:00

libcxxabi

[cmake] [libcxxabi] Don't print warning when tests are disabled.

2018-01-18 18:29:36 +00:00

libunwind

[PPC64] Added vector registers.

2018-01-16 20:54:10 +00:00

lld

[COFF] Keep the underscore on exported decorated stdcall functions in MSVC mode

2018-01-20 11:44:42 +00:00

lldb

Wrap all references to build artifacts in the LLDB testsuite (NFC)

2018-01-19 23:24:35 +00:00

llgo

irgen: Create functions instead of global variables for builtin hash and equal algorithms.

2017-06-04 22:11:28 +00:00

llvm

[X86] Add an override of targetShrinkDemandedConstant to limit the damage that shrinkdemandedbits can do to zext_in_reg operations

2018-01-20 18:50:09 +00:00

openmp

Sprinkle a few <cstdlib> includes, for libomptarget sources using

2018-01-18 18:24:22 +00:00

parallel-libs

[Axccel] Remove -Wno-missing-braces in build

2016-12-19 21:34:07 +00:00

polly

Assume the shared library path variable is LD_LIBRARY_PATH on systems

2018-01-20 14:35:05 +00:00

README.md

Add an svn project to contain the files that appear at the root of the

2017-10-19 21:09:49 +00:00

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.

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