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llvm-project/llvm/tools/llvm-exegesis
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Aiden Grossman 415bf200a7
[llvm-exegesis] Replace --num-repetitions with --min-instructions (#77153) 
This patch replaces --num-repetitions with --min-instructions to make it
more clear that the value refers to the minimum number of instructions
in the final assembled snippet rather than the number of repetitions of
the snippet. This patch also refactors some llvm-exegesis internal
variable names to reflect the name change.

Fixes #76890.
2024-02-01 01:58:27 -08:00
..
lib
[llvm-exegesis] Replace --num-repetitions with --min-instructions (#77153)
2024-02-01 01:58:27 -08:00
CMakeLists.txt
Split out CodeGenTypes from CodeGen for LLT/MVT
2023-05-03 00:13:20 +09:00
llvm-exegesis.cpp
[llvm-exegesis] Replace --num-repetitions with --min-instructions (#77153)
2024-02-01 01:58:27 -08:00
README.md
[Docs][llvm-exegesis] Add documentation for memory annotations
2023-07-18 10:23:07 -07:00

README.md

llvm-exegesis

llvm-exegesis is a benchmarking tool that accepts or assembles a snippet and can measure characteristics of that snippet 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
    • AArch64 only
  • MIPS
  • PowerPC (PowerPC64LE only)

Note that not 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.