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Sanjay Patel 26725bdc50 [InstCombine] add folds for icmp with xor mask constant 
These are the folds in Alive;
Name: xor_ult
Pre: isPowerOf2(-C1)
%xor = xor i8 %x, C1
%r = icmp ult i8 %xor, C1
=>
%r = icmp ugt i8 %x, ~C1

Name: xor_ugt
Pre: isPowerOf2(C1+1)
%xor = xor i8 %x, C1
%r = icmp ugt i8 %xor, C1
=>
%r = icmp ugt i8 %x, C1

https://rise4fun.com/Alive/Vty

The ugt case in its simplest form was already handled by DemandedBits,
but that's not ideal as shown in the multi-use test.

I'm not sure if these are all of the symmetrical folds, but I adjusted 
the existing code for one of the folds to try to show the similarities.

There's no obvious connection, but this is another preliminary step 
for PR14613...
https://bugs.llvm.org/show_bug.cgi?id=14613

llvm-svn: 341997
 		2018-09-11 22:00:15 +00:00
clang [analyzer] Add ExprMutationAnalyzer 2018-09-11 21:13:20 +00:00
clang-tools-extra [clang-tidy] Handle sugared reference types in ExprMutationAnalyzer 2018-09-11 20:05:37 +00:00
compiler-rt [libFuzzer] [Windows] Include windows.h and psapi.h with lowercase 2018-09-11 19:11:54 +00:00
debuginfo-tests Revert "(Retry) Add a basic integration test for C++ smart pointers" 2018-08-20 19:53:33 +00:00
libclc amdgcn: Use __constant AS for amdgcn builtins. 2018-08-03 15:14:08 +00:00
libcxx Update the synopsis for <version>. NFC 2018-09-11 20:51:54 +00:00
libcxxabi Port my recent changes from LLVM copy of the demangler: 2018-08-24 23:30:26 +00:00
libunwind [CMake] Don't use -rtlib=compiler-rt with -nodefaultlibs. 2018-09-04 20:57:50 +00:00
lld Simplify. 2018-09-11 14:37:27 +00:00
lldb Refactoring std::function formatter to move core functionality into CPPLanguageRuntime 2018-09-11 20:58:28 +00:00
llgo Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm [InstCombine] add folds for icmp with xor mask constant 2018-09-11 22:00:15 +00:00
openmp [OPENMP]Increment iterator when the loop is continued. 2018-09-11 17:16:26 +00:00
parallel-libs Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
polly [PerfMonitor] Fix rdtscp callsites 2018-09-11 14:17:44 +00:00
README.md
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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.