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Merged
byroot merged 1 commit into from
Jul 24, 2025
Merged

Don't assume __builtin_cpu_supports exists #828

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2 changes: 2 additions & 0 deletions CHANGES.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
# Changes

* Fix support for older compilers without `__builtin_cpu_supports`.

### Unreleased

### 2025-05-23 (2.13.0)
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26 changes: 15 additions & 11 deletions ext/json/ext/simd/conf.rb
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Original file line number Diff line number Diff line change
@@ -1,20 +1,24 @@
case RbConfig::CONFIG['host_cpu']
when /^(arm|aarch64)/
# Try to compile a small program using NEON instructions
header, type, init = 'arm_neon.h', 'uint8x16_t', 'vdupq_n_u8(32)'
header, type, init, extra = 'arm_neon.h', 'uint8x16_t', 'vdupq_n_u8(32)', nil
when /^(x86_64|x64)/
header, type, init = 'x86intrin.h', '__m128i', '_mm_set1_epi8(32)'
header, type, init, extra = 'x86intrin.h', '__m128i', '_mm_set1_epi8(32)', 'if (__builtin_cpu_supports("sse2")) { printf("OK"); }'
end
if header
have_header(header) && try_compile(<<~SRC)
#{cpp_include(header)}
int main(int argc, char **argv) {
#{type} test = #{init};
if (argc > 100000) printf("%p", &test);
return 0;
}
SRC
$defs.push("-DJSON_ENABLE_SIMD")
if have_header(header) && try_compile(<<~SRC, '-Werror=implicit-function-declaration')
#{cpp_include(header)}
int main(int argc, char **argv) {
#{type} test = #{init};
#{extra}
if (argc > 100000) printf("%p", &test);
return 0;
}
SRC
$defs.push("-DJSON_ENABLE_SIMD")
else
puts "Disable SIMD"
end
end

have_header('cpuid.h')
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