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llvm-project/llvm/tools/llvm-exegesis
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Min-Yih Hsu d01ae56774
Revert "[Exegesis] Add the ability to dry-run the measurement phase (… (#122371) 
…#121991)"

This reverts commit f8f8598fd886cddfd374fa43eb6d7d37d301b576.

This breaks ARMv7 and s390x buildbot with the following message:
```
llvm-exegesis error: No available targets are compatible with triple "armv8l-unknown-linux-gnueabihf"
FileCheck error: '<stdin>' is empty.
FileCheck command line:  /home/tcwg-buildbot/worker/clang-armv7-2stage/stage2/bin/FileCheck /home/tcwg-buildbot/worker/clang-armv7-2stage/llvm/llvm/test/tools/llvm-exegesis/dry-run-measurement.test
```
2025-01-09 12:59:57 -08:00
..
lib
Revert "[Exegesis] Add the ability to dry-run the measurement phase (… (#122371)
2025-01-09 12:59:57 -08:00
CMakeLists.txt
[llvm-exegesis] Fix typos in cmake file
2024-06-14 14:50:25 +02:00
llvm-exegesis.cpp
Revert "[Exegesis] Add the ability to dry-run the measurement phase (… (#122371)
2025-01-09 12:59:57 -08:00
README.md
[Docs][llvm-exegesis] Clarify AArch64 support (#114989)
2024-11-07 10:48:52 +00:00

README.md

llvm-exegesis

llvm-exegesis is a benchmarking tool that accepts or generates snippets and can measure characteristics of those snippets by executing it while keeping track of performance counters.

Currently Supported Platforms

llvm-exegesis is quite platform-dependent and currently only supports a couple platform configurations for benchmarking. The limitations are listed below. Analysis mode in llvm-exegesis is supported on all platforms on which LLVM is.

Currently Supported Operating Systems for Benchmarking

Currently, llvm-exegesis only supports benchmarking on Linux. This is mainly due to a dependency on the Linux perf subsystem for reading performance counters.

The subprocess execution mode and memory annotations currently only supports Linux due to a heavy reliance on many Linux specific syscalls/syscall implementations.

Currently Supported Architectures for Benchmarking

Currently, using llvm-exegesis for benchmarking is supported on the following architectures:

  • x86
    • 64-bit only due to this being the only implemented calling convention in llvm-exegesis currently.
  • ARM
    • Very experimental AArch64 support only: most opcodes probably won't work as e.g. pseudo instructions and most register classes are not supported.
  • MIPS
  • PowerPC (PowerPC64LE only)

Note that not all benchmarking functionality is guaranteed to work on all platforms.

Memory annotations are currently only supported on 64-bit X86. There is no inherent limitations for porting memory annotations to other architectures, but parts of the test harness are implemented as MCJITed assembly that is generated in ./lib/X86/Target.cpp that would need to be implemented on other architectures to bring up support.