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Philip Reames d748689c7f [InstCombine] Eliminate stores to constant memory 
If we have a store to a piece of memory which is known constant, then we know the store must be storing back the same value. As a result, the store (or memset, or memmove) must either be down a dead path, or a noop. In either case, it is valid to simply remove the store.

The motivating case for this involves a memmove to a buffer which is constant down a path which is dynamically dead.

Note that I'm choosing to implement the less aggressive of two possible semantics here. We could simply say that the store *is undefined*, and prune the path. Consensus in the review was that the more aggressive form might be a good follow on change at a later date.

Differential Revision: https://reviews.llvm.org/D60659

llvm-svn: 358919
 		2019-04-22 20:28:19 +00:00
clang [VerifyDiagnosticConsumer] Document -verify=<prefixes> in doxygen 2019-04-22 20:25:06 +00:00
clang-tools-extra [clangd] Support dependent bases in type hierarchy 2019-04-22 01:38:53 +00:00
compiler-rt [TSan] Support fiber API on macOS 2019-04-20 00:18:44 +00:00
debuginfo-tests Set config.lit_tools_dir, which is needed by lit.llvm.initialize. 2018-11-06 21:54:27 +00:00
libclc travis: Add LLVM-8 build 2019-03-27 21:28:31 +00:00
libcxx [libcxx] Update gen_link_script.py to support different input and output 2019-04-22 19:51:33 +00:00
libcxxabi [libc++] Make sure we re-export some missing libc++abi symbols from libc++ 2019-04-18 17:18:15 +00:00
libunwind [NFC] Fix typo in debug log 2019-04-22 15:40:50 +00:00
lld [WebAssembly] Error on relocations against undefined data symbols. 2019-04-22 16:12:54 +00:00
lldb [EditLineTest] Not always TERM is available, e.g. on some bots. 2019-04-22 20:27:10 +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] Eliminate stores to constant memory 2019-04-22 20:28:19 +00:00
openmp Use correct way to test for MIPS arch after rOMP355687 2019-04-22 19:20:46 +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 Apply include-what-you-use #include removal suggestions. NFC. 2019-03-28 20:19:49 +00:00
pstl [pstl] Add a serial backend for the PSTL 2019-04-18 18:20:19 +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
.gitignore Add a reduced copy of the llvm .gitignore 2019-04-09 00:52:49 +00:00
README.md
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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.