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fix: route avxvnni FMA ops through fma3<avx2> kernels #1368

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Merged
JohanMabille merged 1 commit into from
Jun 27, 2026
+7 −1
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fix: route avxvnni FMA ops through fma3<avx2> kernels #1368

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8 changes: 7 additions & 1 deletion include/xsimd/types/xsimd_avxvnni_register.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
#define XSIMD_AVXVNNI_REGISTER_HPP

#include "./xsimd_avx2_register.hpp"
#include "./xsimd_fma3_avx2_register.hpp"

namespace xsimd
{
Expand All @@ -21,7 +22,12 @@ namespace xsimd
*
* AVXVNNI instructions
*/
struct avxvnni : avx2
// Derive from fma3<avx2> rather than avx2 so the FMA3 kernels (fnma/fnms ->
// vfnmadd) are in avxvnni's dispatch chain instead of the generic neg(x*y)+z
// fallback. fma3<avx2> always derives from avx2 and its kernels are only
// registered when XSIMD_WITH_FMA3_AVX2, so when FMA is disabled this base is
// transparent (dispatch falls straight through to avx2).
struct avxvnni : fma3<avx2>
{
static constexpr bool supported() noexcept { return XSIMD_WITH_AVXVNNI; }
static constexpr bool available() noexcept { return true; }
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