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33 lines
1.4 KiB
Diff
33 lines
1.4 KiB
Diff
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From e522b1d09d3536ddc15459b4259150f4a53ee65a Mon Sep 17 00:00:00 2001
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From: Eric Biggers <ebiggers@google.com>
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Date: Thu, 4 Apr 2024 20:16:33 -0400
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Subject: [PATCH] lib/x86: increase AVX-VNNI gcc prerequisite to 12.1
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Although gcc 11.1 supports AVX-VNNI, a popular distro pairs it with a
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binutils version that does not. Require gcc 12 instead.
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Resolves https://github.com/ebiggers/libdeflate/issues/365
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---
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lib/x86/adler32_impl.h | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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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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