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Neither the `__builtin_cpu_supports` probe in conf.rb nor `cpuid.h` has a use now that SSE2 is assumed on x86-64. The probe kept SIMD off on GCC older than 4.8, and the `HAVE_CPUID_H` guard broke builds that have `x86intrin.h` but not `cpuid.h` with a redefinition of `find_simd_implementation`. https://github.com/ruby/json/commit/fae76b9eb4 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>