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34 lines
1.3 KiB
34 lines
1.3 KiB
4 months ago
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import subprocess
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import lit.util
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if not ('X86' in config.root.targets):
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# We need support for X86.
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config.unsupported = True
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elif not ('x86_64' in config.root.host_triple):
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# We need to be running on an X86 host.
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config.unsupported = True
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else:
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# We need libpfm to be installed and allow reading perf counters. We can
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# only know that at runtime, so we try to measure the latency of an empty
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# code snippet and bail out on error.
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llvm_exegesis_exe = lit.util.which('llvm-exegesis', config.llvm_tools_dir)
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if not llvm_exegesis_exe:
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print('llvm-exegesis not found')
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config.unsupported = True
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else:
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try:
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with open(os.devnull, 'w') as quiet:
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check_llvm_exegesis_uops_result = subprocess.call(
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[llvm_exegesis_exe, '-mode', 'uops', '-snippets-file', '/dev/null'], stdout=quiet, stderr=quiet)
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check_llvm_exegesis_latency_result = subprocess.call(
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[llvm_exegesis_exe, '-mode', 'latency', '-snippets-file', '/dev/null'], stdout=quiet, stderr=quiet)
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except OSError:
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print('could not exec llvm-exegesis')
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config.unsupported = True
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if not check_llvm_exegesis_uops_result == 0:
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config.unsupported = True
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if not check_llvm_exegesis_latency_result == 0:
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config.unsupported = True
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