[llvm] [RISCV] Add XSfmm pseudo instruction and vset* insertion support (PR #143068)

[Brandon Wu via llvm-commits]

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@@ -138,6 +138,25 @@ enum {
   // 3 -> SEW * 4
   DestEEWShift = ElementsDependOnMaskShift + 1,
   DestEEWMask = 3ULL << DestEEWShift,
+
+  // 0 -> Don't care about altfmt bit in VTYPE.
+  // 1 -> Is not altfmt.
+  // 2 -> Is altfmt(BF16).
+  AltFmtTypeShift = DestEEWShift + 2,
+  AltFmtTypeMask = 3ULL << AltFmtTypeShift,
+
+  IsWidenShift = AltFmtTypeShift + 2,
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4vtomat wrote:

yeah correct

https://github.com/llvm/llvm-project/pull/143068