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Andrea Di Biagio 1e6d0aad7e [llvm-mca] Introduce a new base class for mca::Instruction, and change how read/write information is stored. 
This patch introduces a new base class for Instruction named InstructionBase.
Class InstructionBase is responsible for tracking data dependencies with the
help of ReadState and WriteState objects.  Class Instruction now derives from
InstructionBase, and adds extra information related to the `InstrStage` as well
as the `RCUTokenID`.

ReadState and WriteState objects are no longer unique pointers. This avoids
extra heap allocation and pointer checks that weren't really needed.  Now, those
objects are simply stored into SmallVectors.  We use a SmallVector instead of a
std::vector because we expect most instructions to only have a very small number
of reads and writes.  By using a simple SmallVector we also avoid extra heap
allocations most of the time.
In a debug build, this improves the performance of llvm-mca by roughly 10% (I
still have to verify the impact in performance on a release build).

llvm-svn: 345280
 		2018-10-25 17:03:51 +00:00
clang [OPENMP]Fix PR39422: variables are not firstprivatized in task context. 2018-10-25 15:35:27 +00:00
clang-tools-extra [clangd] workspace/symbol should be async, it reads from the index. 2018-10-25 14:19:14 +00:00
compiler-rt [sanitizer] Avoid calling a nullptr in MonotonicNanoTime if interceptors are not yet initialized 2018-10-24 18:40:08 +00:00
debuginfo-tests Revert "(Retry) Add a basic integration test for C++ smart pointers" 2018-08-20 19:53:33 +00:00
libclc configure: Rework support for gfx9+ devices that were added post LLVM 3.9 2018-09-15 22:02:01 +00:00
libcxx [libc++] Make sure we can build libc++ with -fvisibility=hidden 2018-10-25 12:13:43 +00:00
libcxxabi cxa_demangle: make demangler's parsing functions overridable 2018-10-16 14:29:14 +00:00
libunwind [CMake] Link to compiler-rt if LIBUNWIND_USE_COMPILER_RT is ON. 2018-10-08 18:35:00 +00:00
lld Do not call computeIsPreemptible() if its result is discarded. NFC. 2018-10-24 22:15:32 +00:00
lldb Get rid of casts. (NFC) 2018-10-25 16:15:17 +00:00
llgo Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm [llvm-mca] Introduce a new base class for mca::Instruction, and change how read/write information is stored. 2018-10-25 17:03:51 +00:00
openmp remove duplicate omp_control_tool export to fix windows build 2018-10-25 11:04:01 +00:00
parallel-libs Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
polly [TI removal] Generically discuss terminators rather than use the soon to 2018-10-18 07:43:30 +00:00
README.md Update the project name in README.md 2018-10-19 00:03:01 +00:00

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.