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Try to fix rhel 8 #146

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Merged
tenderlove merged 1 commit into from
Aug 18, 2026
+9 −15
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Try to fix rhel 8 #146

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24 changes: 9 additions & 15 deletions ext/digest/blake3/extconf.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,9 @@ def blake3_disable(macro)
end

# Probe used to confirm the compiler both accepts +flag+ and can compile the
# intrinsics the backend relies on.
# intrinsics the backend relies on. It compiles the backend source itself:
# a small snippet misses assemblers that reject what the compiler emits (e.g.
# binutils 2.30 on RHEL 8 rejects AVX-512 code from gcc 8.5).
def blake3_have_isa?(name, flag, snippet)
checking_for("#{name} intrinsics" + (flag ? " (#{flag})" : "")) do
try_compile(snippet, flag)
Expand All @@ -40,23 +42,15 @@ def blake3_have_isa?(name, flag, snippet)
when /\A(x86_64|amd64|x64)\z/i
# Try to detect which SIMD features this x86 machine and compiler has
x86_backends = [
["blake3_sse2", "SSE2", ["-msse2", "-arch:SSE2"],
"#include <immintrin.h>\nint main(void){ volatile __m128i x = _mm_setzero_si128(); (void)x; return 0; }\n",
"BLAKE3_NO_SSE2"],
["blake3_sse41", "SSE4.1", ["-msse4.1", "-arch:AVX"],
"#include <immintrin.h>\nint main(void){ volatile __m128i x = _mm_setzero_si128(); return _mm_testz_si128(x, x); }\n",
"BLAKE3_NO_SSE41"],
["blake3_avx2", "AVX2", ["-mavx2", "-arch:AVX2"],
"#include <immintrin.h>\nint main(void){ volatile __m256i x = _mm256_setzero_si256(); (void)x; return 0; }\n",
"BLAKE3_NO_AVX2"],
["blake3_avx512", "AVX-512", ["-mavx512f -mavx512vl", "-arch:AVX512"],
"#include <immintrin.h>\nint main(void){ volatile __m512i x = _mm512_setzero_si512(); (void)x; return 0; }\n",
"BLAKE3_NO_AVX512"],
["blake3_sse2", "SSE2", ["-msse2", "-arch:SSE2"], "BLAKE3_NO_SSE2"],
["blake3_sse41", "SSE4.1", ["-msse4.1", "-arch:AVX"], "BLAKE3_NO_SSE41"],
["blake3_avx2", "AVX2", ["-mavx2", "-arch:AVX2"], "BLAKE3_NO_AVX2"],
["blake3_avx512", "AVX-512", ["-mavx512f -mavx512vl", "-arch:AVX512"], "BLAKE3_NO_AVX512"],
]

x86_backends.each do |obj, name, flags, snippet, no_macro|
x86_backends.each do |obj, name, flags, no_macro|
[nil, *flags].any? do |flag|
if blake3_have_isa?(name, flag, snippet)
if blake3_have_isa?(name, flag, %{#include "#{$srcdir}/#{obj}.c"\n})
objs << obj
simd_cflags[obj] = flag
true
Expand Down