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22 lines
1.1 KiB
Diff
22 lines
1.1 KiB
Diff
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diff --git a/lib/x86/adler32_impl.h b/lib/x86/adler32_impl.h
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index ba559e6..00967e8 100644
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--- a/lib/x86/adler32_impl.h
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+++ b/lib/x86/adler32_impl.h
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@@ -52,8 +52,15 @@
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/*
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* AVX-VNNI implementation. This is used on CPUs that have AVX2 and AVX-VNNI
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* but don't have AVX-512, for example Intel Alder Lake.
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+ *
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+ * Unusually for a new CPU feature, gcc added support for the AVX-VNNI
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+ * intrinsics (in gcc 11.1) slightly before binutils added support for
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+ * assembling AVX-VNNI instructions (in binutils 2.36). Distros can reasonably
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+ * have gcc 11 with binutils 2.35. Because of this issue, we check for gcc 12
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+ * instead of gcc 11. (libdeflate supports direct compilation without a
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+ * configure step, so checking the binutils version is not always an option.)
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*/
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-#if GCC_PREREQ(11, 1) || CLANG_PREREQ(12, 0, 13000000) || MSVC_PREREQ(1930)
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+#if GCC_PREREQ(12, 1) || CLANG_PREREQ(12, 0, 13000000) || MSVC_PREREQ(1930)
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# define adler32_x86_avx2_vnni adler32_x86_avx2_vnni
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# define SUFFIX _avx2_vnni
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# define ATTRIBUTES _target_attribute("avx2,avxvnni")
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