[RISCV] Deduplicate zvfhmin and zvfbfmin operation actions. NFC

After #108937 fp16 w/o zvfh and bf16 are now in sync and should have
the same lowering.

Author: lukel97

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -1063,6 +1063,45 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
           }
         };
 
+    // Sets common actions for f16 and bf16 for when there's only
+    // zvfhmin/zvfbfmin and we need to promote to f32 for most operations.
+    const auto SetCommonPromoteToF32Actions = [&](MVT VT) {
+      setOperationAction({ISD::FP_ROUND, ISD::FP_EXTEND}, VT, Custom);
+      setOperationAction({ISD::STRICT_FP_ROUND, ISD::STRICT_FP_EXTEND}, VT,
+                         Custom);
+      setOperationAction({ISD::VP_FP_ROUND, ISD::VP_FP_EXTEND}, VT, Custom);
+      setOperationAction({ISD::VP_MERGE, ISD::VP_SELECT, ISD::SELECT}, VT,
+                         Custom);
+      setOperationAction(ISD::SELECT_CC, VT, Expand);
+      setOperationAction({ISD::SINT_TO_FP, ISD::UINT_TO_FP, ISD::VP_SINT_TO_FP,
+                          ISD::VP_UINT_TO_FP},
+                         VT, Custom);
+      setOperationAction({ISD::CONCAT_VECTORS, ISD::INSERT_SUBVECTOR,
+                          ISD::EXTRACT_SUBVECTOR, ISD::VECTOR_INTERLEAVE,
+                          ISD::VECTOR_DEINTERLEAVE},
+                         VT, Custom);
+      MVT EltVT = VT.getVectorElementType();
+      if (isTypeLegal(EltVT))
+        setOperationAction(ISD::SPLAT_VECTOR, VT, Custom);
+      else
+        setOperationAction(ISD::SPLAT_VECTOR, EltVT, Custom);
+      setOperationAction({ISD::LOAD, ISD::STORE}, VT, Custom);
+
+      setOperationAction(ISD::FNEG, VT, Expand);
+      setOperationAction(ISD::FABS, VT, Expand);
+      setOperationAction(ISD::FCOPYSIGN, VT, Expand);
+
+      // Custom split nxv32[b]f16 since nxv32[b]f32 is not legal.
+      if (getLMUL(VT) == RISCVII::VLMUL::LMUL_8) {
+        setOperationAction(ZvfhminZvfbfminPromoteOps, VT, Custom);
+        setOperationAction(ZvfhminZvfbfminPromoteVPOps, VT, Custom);
+      } else {
+        MVT F32VecVT = MVT::getVectorVT(MVT::f32, VT.getVectorElementCount());
+        setOperationPromotedToType(ZvfhminZvfbfminPromoteOps, VT, F32VecVT);
+        setOperationPromotedToType(ZvfhminZvfbfminPromoteVPOps, VT, F32VecVT);
+      }
+    };
+
     if (Subtarget.hasVInstructionsF16()) {
       for (MVT VT : F16VecVTs) {
         if (!isTypeLegal(VT))
@@ -1073,83 +1112,15 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
       for (MVT VT : F16VecVTs) {
         if (!isTypeLegal(VT))
           continue;
-        setOperationAction({ISD::FP_ROUND, ISD::FP_EXTEND}, VT, Custom);
-        setOperationAction({ISD::STRICT_FP_ROUND, ISD::STRICT_FP_EXTEND}, VT,
-                           Custom);
-        setOperationAction({ISD::VP_FP_ROUND, ISD::VP_FP_EXTEND}, VT, Custom);
-        setOperationAction({ISD::VP_MERGE, ISD::VP_SELECT, ISD::SELECT}, VT,
-                           Custom);
-        setOperationAction(ISD::SELECT_CC, VT, Expand);
-        setOperationAction({ISD::SINT_TO_FP, ISD::UINT_TO_FP,
-                            ISD::VP_SINT_TO_FP, ISD::VP_UINT_TO_FP},
-                           VT, Custom);
-        setOperationAction({ISD::CONCAT_VECTORS, ISD::INSERT_SUBVECTOR,
-                            ISD::EXTRACT_SUBVECTOR, ISD::VECTOR_INTERLEAVE,
-                            ISD::VECTOR_DEINTERLEAVE},
-                           VT, Custom);
-        if (Subtarget.hasStdExtZfhmin())
-          setOperationAction(ISD::SPLAT_VECTOR, VT, Custom);
-        else
-          setOperationAction(ISD::SPLAT_VECTOR, MVT::f16, Custom);
-        // load/store
-        setOperationAction({ISD::LOAD, ISD::STORE}, VT, Custom);
-
-        setOperationAction(ISD::FNEG, VT, Expand);
-        setOperationAction(ISD::FABS, VT, Expand);
-        setOperationAction(ISD::FCOPYSIGN, VT, Expand);
-
-        // Custom split nxv32f16 since nxv32f32 is not legal.
-        if (VT == MVT::nxv32f16) {
-          setOperationAction(ZvfhminZvfbfminPromoteOps, VT, Custom);
-          setOperationAction(ZvfhminZvfbfminPromoteVPOps, VT, Custom);
-          continue;
-        }
-        // Add more promote ops.
-        MVT F32VecVT = MVT::getVectorVT(MVT::f32, VT.getVectorElementCount());
-        setOperationPromotedToType(ZvfhminZvfbfminPromoteOps, VT, F32VecVT);
-        setOperationPromotedToType(ZvfhminZvfbfminPromoteVPOps, VT, F32VecVT);
+        SetCommonPromoteToF32Actions(VT);
       }
     }
 
-    // TODO: merge with zvfhmin
     if (Subtarget.hasVInstructionsBF16Minimal()) {
       for (MVT VT : BF16VecVTs) {
         if (!isTypeLegal(VT))
           continue;
-        setOperationAction({ISD::FP_ROUND, ISD::FP_EXTEND}, VT, Custom);
-        setOperationAction({ISD::STRICT_FP_ROUND, ISD::STRICT_FP_EXTEND}, VT,
-                           Custom);
-        setOperationAction({ISD::VP_FP_ROUND, ISD::VP_FP_EXTEND}, VT, Custom);
-        setOperationAction({ISD::VP_MERGE, ISD::VP_SELECT, ISD::SELECT}, VT,
-                           Custom);
-        setOperationAction(ISD::SELECT_CC, VT, Expand);
-        setOperationAction({ISD::SINT_TO_FP, ISD::UINT_TO_FP,
-                            ISD::VP_SINT_TO_FP, ISD::VP_UINT_TO_FP},
-                           VT, Custom);
-        setOperationAction({ISD::CONCAT_VECTORS, ISD::INSERT_SUBVECTOR,
-                            ISD::EXTRACT_SUBVECTOR, ISD::VECTOR_INTERLEAVE,
-                            ISD::VECTOR_DEINTERLEAVE},
-                           VT, Custom);
-        if (Subtarget.hasStdExtZfbfmin())
-          setOperationAction(ISD::SPLAT_VECTOR, VT, Custom);
-        else
-          setOperationAction(ISD::SPLAT_VECTOR, MVT::bf16, Custom);
-        setOperationAction({ISD::LOAD, ISD::STORE}, VT, Custom);
-
-        setOperationAction(ISD::FNEG, VT, Expand);
-        setOperationAction(ISD::FABS, VT, Expand);
-        setOperationAction(ISD::FCOPYSIGN, VT, Expand);
-
-        // Custom split nxv32f16 since nxv32f32 is not legal.
-        if (VT == MVT::nxv32bf16) {
-          setOperationAction(ZvfhminZvfbfminPromoteOps, VT, Custom);
-          setOperationAction(ZvfhminZvfbfminPromoteVPOps, VT, Custom);
-          continue;
-        }
-        // Add more promote ops.
-        MVT F32VecVT = MVT::getVectorVT(MVT::f32, VT.getVectorElementCount());
-        setOperationPromotedToType(ZvfhminZvfbfminPromoteOps, VT, F32VecVT);
-        setOperationPromotedToType(ZvfhminZvfbfminPromoteVPOps, VT, F32VecVT);
+        SetCommonPromoteToF32Actions(VT);
       }
     }