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069a24c93c
Fix: https://github.com/ruby/json/issues/827
On very old compilers it might not exist, at that point
might as well skip SIMD entirely.
da878435dc
24 lines
754 B
Ruby
24 lines
754 B
Ruby
case RbConfig::CONFIG['host_cpu']
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when /^(arm|aarch64)/
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# Try to compile a small program using NEON instructions
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header, type, init, extra = 'arm_neon.h', 'uint8x16_t', 'vdupq_n_u8(32)', nil
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when /^(x86_64|x64)/
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header, type, init, extra = 'x86intrin.h', '__m128i', '_mm_set1_epi8(32)', 'if (__builtin_cpu_supports("sse2")) { printf("OK"); }'
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end
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if header
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if have_header(header) && try_compile(<<~SRC, '-Werror=implicit-function-declaration')
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#{cpp_include(header)}
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int main(int argc, char **argv) {
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#{type} test = #{init};
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#{extra}
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if (argc > 100000) printf("%p", &test);
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return 0;
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}
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SRC
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$defs.push("-DJSON_ENABLE_SIMD")
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else
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puts "Disable SIMD"
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end
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end
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have_header('cpuid.h')
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