[llvm] [X86][CodeGen] Support EVEX compression: NDD to nonNDD (PR #77731)

[Phoebe Wang via llvm-commits]

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@@ -241,26 +264,37 @@ static bool CompressEVEXImpl(MachineInstr &MI, const X86Subtarget &ST) {
   //
   // For AVX512 cases, EVEX prefix is needed in order to carry this information
   // thus preventing the transformation to VEX encoding.
-  if (TSFlags & X86II::EVEX_B)
+  bool IsND = X86II::hasNewDataDest(TSFlags);
+  if (TSFlags & X86II::EVEX_B && !IsND)
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phoebewang wrote:

`(TSFlags & X86II::EVEX_B)`

https://github.com/llvm/llvm-project/pull/77731