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When using GCC on x86-64 to compile an usdt prog with -O1 or higher optimization, the compiler will generate SIB addressing mode for global array, e.g. "1@-96(%rbp,%rax,8)". In this patch: - enrich subtest_basic_usdt test case to cover SIB addressing usdt argument spec handling logic Signed-off-by: Jiawei Zhao <phoenix500526@163.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20250827053128.1301287-3-phoenix500526@163.com