[llvm] [X86] Fast AVX-512-VNNI vpdpwssd tuning (PR #85033)

[Simon Pilgrim via llvm-commits]

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@@ -683,6 +683,12 @@ def TuningFastGather
     : SubtargetFeature<"fast-gather", "HasFastGather", "true",
                        "Indicates if gather is reasonably fast (this is true for Skylake client and all AVX-512 CPUs)">;
 
+// Generate vpdpwssd instead of vpmaddwd+vpaddd sequence.
+def TuningFastPWSSD
+    : SubtargetFeature<
+          "fast-pwssd", "HasFastPWSSD", "true",
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RKSimon wrote:

Shouldn't it be fast-dpwssd?

https://github.com/llvm/llvm-project/pull/85033