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Huihui Zhang 8952199715 [InstCombine] Fold a shifty implementation of clamp-to-zero. 
Summary:
Fold
and(ashr(subNSW(Y, X), ScalarSizeInBits(Y)-1), X)
into
X s> Y ? X : 0

https://rise4fun.com/Alive/lFH

Fold shift into select enables more optimization,
e.g., vmax generation for ARM target.

Reviewers: lebedev.ri, efriedma, spatel, kparzysz, bcahoon

Reviewed By: lebedev.ri

Subscribers: xbolva00, andreadb, craig.topper, RKSimon, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67799

llvm-svn: 372676
 		2019-09-24 00:15:03 +00:00
clang Revert "Support for DWARF-5 C++ language tags." 2019-09-23 23:49:36 +00:00
clang-tools-extra [Clang-doc] NFC: Fixed link to llvm bugs in documentation 2019-09-23 16:55:13 +00:00
compiler-rt [llvm-cov] NFC: Specify a specific C++ standard in the test. 2019-09-24 00:01:51 +00:00
debuginfo-tests Make nrvo-string test more robust. 2019-06-27 20:38:37 +00:00
libc Add a director, along with README.txt and LICENSE.txt, for libc. 2019-09-16 21:39:08 +00:00
libclc Revert "Rename F_{None,Text,Append} to OF_{None,Text,Append}. NFC" 2019-08-05 17:23:23 +00:00
libcxx [libc++] Mark CTAD tests as not failing on AppleClang 10.0.1 2019-09-23 17:22:13 +00:00
libcxxabi Update XFAIL list for new GCC versions 2019-09-13 18:43:29 +00:00
libunwind Unwind: avoid warning about unused typedef 2019-09-20 20:46:33 +00:00
lld [lld][WebAssembly] Preserve symbol flags in --relocatable output 2019-09-23 21:28:29 +00:00
lldb [Make] Add support for building NeXT-style frameworks 2019-09-23 22:31:16 +00:00
llgo IR: Support parsing numeric block ids, and emit them in textual output. 2019-03-22 18:27:13 +00:00
llvm [InstCombine] Fold a shifty implementation of clamp-to-zero. 2019-09-24 00:15:03 +00:00
openmp [OpenMP] Change initialization of __kmp_global 2019-09-04 17:47:37 +00:00
parallel-libs Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
polly [CodeGen] Handle outlining of CopyStmts. 2019-09-17 22:59:43 +00:00
pstl [pstl] Allow customizing whether per-TU insulation is provided 2019-08-13 12:49:00 +00:00
.arcconfig Update monorepo .arcconfig with new project callsign. 2019-01-31 14:34:59 +00:00
.clang-format Add .clang-tidy and .clang-format files to the toplevel of the 2019-01-29 16:43:16 +00:00
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.git-blame-ignore-revs Add LLDB reformatting to .git-blame-ignore-revs 2019-09-04 09:31:55 +00:00
.gitignore Add a newline at the end of the file 2019-09-04 06:33:46 +00:00
README.md
…

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.