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

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,

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

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 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

that would need to be implemented on other architectures to bring up support.