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Alina Sbirlea 50db8a2086 [ModRefInfo] Add must alias info to ModRefInfo. 
Summary:
Add an additional bit to ModRefInfo, ModRefInfo::Must, to be cleared for known must aliases.
Shift existing Mod/Ref/ModRef values to include an additional most
significant bit. Update wrappers that modify ModRefInfo values to
reflect the change.

Notes:
* ModRefInfo::Must is almost entirely cleared in the AAResults methods, the remaining changes are trying to preserve it.
* Only some small changes to make custom AA passes set ModRefInfo::Must (BasicAA).
* GlobalsModRef already declares a bit, who's meaning overlaps with the most significant bit in ModRefInfo (MayReadAnyGlobal). No changes to shift the value of MayReadAnyGlobal (see AlignedMap). FunctionInfo.getModRef() ajusts most significant bit so correctness is preserved, but the Must info is lost.
* There are cases where the ModRefInfo::Must is not set, e.g. 2 calls that only read will return ModRefInfo::NoModRef, though they may read from exactly the same location.

Reviewers: dberlin, hfinkel, george.burgess.iv

Subscribers: llvm-commits, sanjoy

Differential Revision: https://reviews.llvm.org/D38862

llvm-svn: 321309
 		2017-12-21 21:41:53 +00:00
clang Revert "[CodeGen] Fix crash when a function taking transparent union is redeclared." 2017-12-21 20:52:59 +00:00
clang-tools-extra [clangd] Don't re-hash SymbolID in maps, just use the SHA1 data 2017-12-21 20:11:46 +00:00
compiler-rt [sanitizer] Make function declarations C-compatible 2017-12-21 20:51:16 +00:00
debuginfo-tests [debuginfo-tests] Support moving debuginfo-tests to llvm/projects 2017-12-12 16:54:20 +00:00
libclc configure.py: Add gfx900 (Vega, Raven) 2017-11-27 11:14:06 +00:00
libcxx Fix the definitions of 'reference' and 'pointer' in string_view that no one uses :-). Thanks to K-ballo for the catch. 2017-12-20 16:31:40 +00:00
libcxxabi [libcxxabi] Pass LIBCXXABI_SYSROOT and LIBCXXABI_GCC_TOOLCHAIN to lit 2017-12-12 01:20:37 +00:00
libunwind [libunwind][MIPS]: Add support for unwinding in O32 and N64 processes. 2017-12-12 21:43:36 +00:00
lld [WebAssembly] Add extra test for weak global symbols 2017-12-21 21:15:00 +00:00
lldb Make one more test redhat-compatible 2017-12-21 15:52:59 +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 [ModRefInfo] Add must alias info to ModRefInfo. 2017-12-21 21:41:53 +00:00
openmp Add missing test case from D41171 commit 2017-12-21 14:36:36 +00:00
parallel-libs [Axccel] Remove -Wno-missing-braces in build 2016-12-19 21:34:07 +00:00
polly [ScopBuilder] Split statements on encountering store instructions. 2017-12-11 12:51:24 +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.