https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125949
--- Comment #5 from Haochen Jiang <haochen.jiang at intel dot com> ---
I get the point, zen6 has xmm16+ support but no evex avxvnniint8 support, which
is in avx10.2/avx10_v1_aux.
However,...
(In reply to vekumar from comment #4)
> Changing this pattern helps
> --Snip--
> diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
> index 912fc1af018..9d334f9115f 100644
> --- a/gcc/config/i386/i386.md
> +++ b/gcc/config/i386/i386.md
> @@ -583,7 +583,7 @@
>
> sse_noavx,sse2,sse2_noavx,sse3,sse3_noavx,sse4,sse4_noavx,
>
> avx,noavx,avx2,noavx2,bmi,bmi2,fma4,fma,avx512f,noavx512f,
> avx512bw,noavx512bw,avx512dq,noavx512dq,fma_or_avx512vl,
> -
> avx512vl,noavx512vl,avxvnni,avx512vnnivl,avx512fp16,avxifma,
> +
> avx512vl,noavx512vl,avxvnni,avxvnniint8,avx512vnnivl,avx512fp16,avxifma,
> avx512ifmavl,avxneconvert,avx512bf16vl,vpclmulqdqvl,
>
> avx_noavx512f,avx_noavx512vl,vaes_avx512vl,noapx_nf,avx10_2"
> (const_string "base"))
> @@ -967,6 +967,7 @@
> (eq_attr "isa" "avx512vl") (symbol_ref "TARGET_AVX512VL")
> (eq_attr "isa" "noavx512vl") (symbol_ref "!TARGET_AVX512VL")
> (eq_attr "isa" "avxvnni") (symbol_ref "TARGET_AVXVNNI")
> + (eq_attr "isa" "avxvnniint8") (symbol_ref "TARGET_AVXVNNIINT8")
> (eq_attr "isa" "avx512vnnivl")
> (symbol_ref "TARGET_AVX512VNNI && TARGET_AVX512VL")
> (eq_attr "isa" "avx512fp16")
> diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
> index bb150f6b5f9..3ab607a1197 100644
> --- a/gcc/config/i386/sse.md
> +++ b/gcc/config/i386/sse.md
> @@ -32624,15 +32624,19 @@
> })
>
> (define_insn "vpdp<vpdotprodtype>_<mode>"
> - [(set (match_operand:VI4_AVX 0 "register_operand" "=v")
> + [(set (match_operand:VI4_AVX 0 "register_operand" "=x,v")
> (unspec:VI4_AVX
> - [(match_operand:VI4_AVX 1 "register_operand" "0")
> - (match_operand:VI4_AVX 2 "register_operand" "v")
> - (match_operand:VI4_AVX 3 "nonimmediate_operand" "vm")]
> + [(match_operand:VI4_AVX 1 "register_operand" "0,0")
> + (match_operand:VI4_AVX 2 "register_operand" "x,v")
> + (match_operand:VI4_AVX 3 "nonimmediate_operand" "xjm,vm")]
> VPDOTPROD))]
> "TARGET_AVXVNNIINT8 || TARGET_AVX10_2"
> - "vpdp<vpdotprodtype>\t{%3, %2, %0|%0, %2, %3}"
> - [(set_attr "prefix" "maybe_evex")])
> + "@
> + %{vex%} vpdp<vpdotprodtype>\t{%3, %2, %0|%0, %2, %3}
> + vpdp<vpdotprodtype>\t{%3, %2, %0|%0, %2, %3}"
> + [(set_attr "prefix" "vex,evex")
> + (set_attr "addr" "gpr16,*")
> + (set_attr "isa" "avxvnniint8,avx10_2")])
>
> (define_insn "vpdp<vpdotprodtype>_v16si"
> [(set (match_operand:V16SI 0 "register_operand" "=v")
> --Snip-
... we should not introduce vex prefix here since this is redundant.
