Tomer Shafir 37801e9e99
[MCA] Enhance debug prints of processor resources (#190132)
Previously, `computeProcResourceMasks()` would print resource masks on
debug mode from multiple call sites, creating noise in the debug output.
This patch aims to fix this and also print more info about the
resources.

It splits to 2 types of debug prints for resources:

1. No simulation - mask only
2. Simulation - mask + other info

For 2, it shares printing on a single place in `ResourceManager`
constructor, that should cover all the other simulation cases
indirectly:

1. `llvm/lib/MCA/HardwareUnits/ResourceManager` - covered
2. `llvm/lib/MCA/InstrBuilder.c` - should be covered indirectly - only
used by `llvm-mca` before simulation that constructs a `ResourceManager`
3. `llvm/tools/llvm-mca/Views/SummaryView.cpp` - after simulation that
constructs a `ResourceManager`
4. `llvm/tools/llvm-mca/Views/BottleneckAnalysis.cpp` - after simulation
that constructs a `ResourceManager`

It also adds `BufferSize` to the output, which should be useful to debug
scheduling model + MCA integration.

For 1, it inlines mask-only printing into 2 other callers:

1. `llvm/include/llvm/MCA/Stages/InstructionTables.h`
2. `llvm/tools/llvm-exegesis/lib/SchedClassResolution.cpp`

as they only use the masks there. I think this is a reasonable
duplication across distinguishably different users/tools.

Now every pair of callers, even across groups (1 and 2), effectively
print in a mutually exclusive way.

The patch adds debug tests for the 3 new callers, in the corresponding
root test directories, to drive further location of logically
target-independent tests that just require some target at the root. I
think this convention is more discoverable, and is pretty widely used in
the project.
2026-04-06 20:27:18 +03:00

The LLVM Compiler Infrastructure

OpenSSF Scorecard OpenSSF Best Practices libc++

Welcome to the LLVM project!

This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The LLVM project has multiple components. The core of the project is itself called "LLVM". This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.

C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.

Other components include: the libc++ C++ standard library, the LLD linker, and more.

Getting the Source Code and Building LLVM

Consult the Getting Started with LLVM page for information on building and running LLVM.

For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

Getting in touch

Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.

The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.

Description
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.
Readme 5.7 GiB
Languages
LLVM 42.4%
C++ 30.1%
C 12.8%
Assembly 9.8%
MLIR 1.6%
Other 2.9%