[llvm] [llvm][RISCV] Support Zvfofp8min llvm intrinsics and codegen (PR #172585)

[Craig Topper via llvm-commits]

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@@ -24,3 +24,130 @@ let Predicates = [HasStdExtZvfofp8min], Constraints = "@earlyclobber $vd",
   defm VFNCVT_F_F_Q : VNCVTF_FV_VS2<"vfncvt.f.f.q", 0b010010, 0b11001>;
   defm VFNCVT_SAT_F_F_Q : VNCVTF_FV_VS2<"vfncvt.sat.f.f.q", 0b010010, 0b11011>;
 }
+
+//===----------------------------------------------------------------------===//
+// Pseudo instructions
+//===----------------------------------------------------------------------===//
+defvar MxListQ = [V_MF8, V_MF4, V_MF2, V_M1, V_M2];
+
+defset list<VTypeInfoToWide> AllWidenableIntToBFloatVectors = {
+  def : VTypeInfoToWide<VI8MF8, VBF16MF4>;
+  def : VTypeInfoToWide<VI8MF4, VBF16MF2>;
+  def : VTypeInfoToWide<VI8MF2, VBF16M1>;
+  def : VTypeInfoToWide<VI8M1, VBF16M2>;
+  def : VTypeInfoToWide<VI8M2, VBF16M4>;
+  def : VTypeInfoToWide<VI8M4, VBF16M8>;
+}
+
+defset list<VTypeInfoToWide> AllWidenableInt8ToFloat32Vectors = {
+  def : VTypeInfoToWide<VI8MF8, VF32MF2>;
+  def : VTypeInfoToWide<VI8MF4, VF32M1>;
+  def : VTypeInfoToWide<VI8MF2, VF32M2>;
+  def : VTypeInfoToWide<VI8M1, VF32M4>;
+  def : VTypeInfoToWide<VI8M2, VF32M8>;
+}
+
+class QVRClass<LMULInfo m> {
+  LMULInfo c = !cond(!eq(m, V_MF8): V_MF2,
+                     !eq(m, V_MF4): V_M1,
+                     !eq(m, V_MF2): V_M2,
+                     !eq(m, V_M1): V_M4,
+                     !eq(m, V_M2): V_M8);
+}
+
+multiclass VPseudoVWCVTD_V_NoSched_Zvfofp8min {
+  defvar constraint = "@earlyclobber $rd";
+  foreach m = MxListW in {
+    defm _V : VPseudoConversion<m.wvrclass, m.vrclass, m, constraint, sew=8,
+                                TargetConstraintType=3>;
+  }
+}
+
+multiclass VPseudoVNCVTD_W_RM_NoSched_Zvfofp8min {
+  defvar constraint = "@earlyclobber $rd";
+  foreach m = MxListW in {
+    defm _W : VPseudoConversionRoundingMode<m.vrclass, m.wvrclass, m,
+                                            constraint, sew=8,
+                                            TargetConstraintType=2>;
+  }
+}
+
+multiclass VPseudoVNCVTD_Q_RM_NoSched_Zvfofp8min {
+  defvar constraint = "@earlyclobber $rd";
+  foreach m = MxListQ in {
+    defm _Q : VPseudoConversionRoundingMode<m.vrclass, QVRClass<m>.c.vrclass, m,
+                                            constraint, sew=8,
+                                            TargetConstraintType=2>;
+  }
+}
+
+let mayRaiseFPException = true, Predicates = [HasStdExtZvfofp8min] in {
+  defm PseudoVFWCVTBF16_F_F : VPseudoVWCVTD_V_NoSched_Zvfofp8min;
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topperc wrote:

Do we need to set AltFmtType to IS_NOT_ALTFMT here?

https://github.com/llvm/llvm-project/pull/172585