1import subprocess
2import lit.util
3
4if not ('Mips' in config.root.targets):
5    # We need support for Mips.
6    config.unsupported = True
7
8elif not ('mips' in config.root.host_triple):
9    # We need to be running on an Mips host.
10    config.unsupported = True
11
12else:
13    # We need libpfm to be installed and allow reading perf counters. We can
14    # only know that at runtime, so we try to measure the latency of an empty
15    # code snippet and bail out on error.
16    llvm_exegesis_exe = lit.util.which('llvm-exegesis', config.llvm_tools_dir)
17    if not llvm_exegesis_exe:
18        print('llvm-exegesis not found')
19        config.unsupported = True
20    else:
21      try:
22          with open(os.devnull, 'w') as quiet:
23              check_llvm_exegesis_result = subprocess.call(
24                [llvm_exegesis_exe, '-mode', 'latency', '-snippets-file', '/dev/null'], stdout=quiet, stderr=quiet)
25      except OSError:
26          print('could not exec llvm-exegesis')
27          config.unsupported = True
28      if not check_llvm_exegesis_result == 0:
29        config.unsupported = True
30