[RISCV][sema] Correct the requirement of vf[n|w]cvt.x[|u].f intrinsics (llvm#101811)

Fix llvm#101526

`vf[n|w]cvt.x[|u].f` for f16 needs `zvfh` instead of `zvfhmin`, current
approach
is not able to detect this. Ultimately we need to add `zvfh` to
RequiredFeatures
to check other intrinsics instead, the type check should be done in
checkRVVTypeSupport.

Author: 4vtomat

clang/include/clang/Basic/riscv_vector.td

@@ -1918,8 +1918,18 @@ def vfcvt_rtz_x_f_v : RVVConvToSignedBuiltin<"vfcvt_rtz_x">;
 let Log2LMUL = [-3, -2, -1, 0, 1, 2] in {
   def vfwcvt_rtz_xu_f_v : RVVConvToWidenUnsignedBuiltin<"vfwcvt_rtz_xu">;
   def vfwcvt_rtz_x_f_v : RVVConvToWidenSignedBuiltin<"vfwcvt_rtz_x">;
-  def vfwcvt_f_xu_v : RVVConvBuiltin<"Fw", "FwUv", "csi", "vfwcvt_f">;
-  def vfwcvt_f_x_v : RVVConvBuiltin<"Fw", "Fwv", "csi", "vfwcvt_f">;
+  def vfwcvt_f_xu_v : RVVConvBuiltin<"Fw", "FwUv", "si", "vfwcvt_f">;
+  def vfwcvt_f_x_v : RVVConvBuiltin<"Fw", "Fwv", "si", "vfwcvt_f">;
+  let RequiredFeatures = ["Zvfh"] in {
+    let Name = "vfwcvt_f_xu_v",
+        IRName = "vfwcvt_f_xu_v",
+        MaskedIRName = "vfwcvt_f_xu_v_mask" in
+      def : RVVConvBuiltin<"Fw", "FwUv", "c", "vfwcvt_f">;
+    let Name = "vfwcvt_f_x_v",
+        IRName = "vfwcvt_f_x_v",
+        MaskedIRName = "vfwcvt_f_x_v_mask" in
+      def : RVVConvBuiltin<"Fw", "Fwv", "c", "vfwcvt_f">;
+  }
   def vfwcvt_f_f_v : RVVConvBuiltin<"w", "wv", "f", "vfwcvt_f">;
   let RequiredFeatures = ["Zvfhmin"] in
     def vfwcvt_f_f_v_fp16 : RVVConvBuiltin<"w", "wv", "x", "vfwcvt_f"> {
@@ -1933,6 +1943,16 @@ let Log2LMUL = [-3, -2, -1, 0, 1, 2] in {
 let Log2LMUL = [-3, -2, -1, 0, 1, 2] in {
   def vfncvt_rtz_xu_f_w : RVVConvToNarrowingUnsignedBuiltin<"vfncvt_rtz_xu">;
   def vfncvt_rtz_x_f_w : RVVConvToNarrowingSignedBuiltin<"vfncvt_rtz_x">;
+  let RequiredFeatures = ["Zvfh"] in {
+    let Name = "vfncvt_rtz_xu_f_w",
+        IRName = "vfncvt_rtz_xu_f_w",
+        MaskedIRName = "vfncvt_rtz_xu_f_w_mask" in
+      def : RVVConvBuiltin<"Uv", "UvFw", "c", "vfncvt_rtz_xu">;
+    let Name = "vfncvt_rtz_x_f_w",
+        IRName = "vfncvt_rtz_x_f_w",
+        MaskedIRName = "vfncvt_rtz_x_f_w_mask" in
+      def : RVVConvBuiltin<"Iv", "IvFw", "c", "vfncvt_rtz_x">;
+  }
   def vfncvt_rod_f_f_w : RVVConvBuiltin<"v", "vw", "xf", "vfncvt_rod_f">;
 }
 
@@ -2011,10 +2031,18 @@ let ManualCodegen = [{
     let Log2LMUL = [-3, -2, -1, 0, 1, 2] in {
       let OverloadedName = "vfncvt_x" in
         defm :
-          RVVConvBuiltinSet<"vfncvt_x_f_w", "csi", [["Iv", "IvFwu"]]>;
+          RVVConvBuiltinSet<"vfncvt_x_f_w", "si", [["Iv", "IvFwu"]]>;
       let OverloadedName = "vfncvt_xu" in
         defm :
-          RVVConvBuiltinSet<"vfncvt_xu_f_w", "csi", [["Uv", "UvFwu"]]>;
+          RVVConvBuiltinSet<"vfncvt_xu_f_w", "si", [["Uv", "UvFwu"]]>;
+      let RequiredFeatures = ["Zvfh"] in {
+        let OverloadedName = "vfncvt_x" in
+          defm :
+            RVVConvBuiltinSet<"vfncvt_x_f_w", "c", [["Iv", "IvFwu"]]>;
+        let OverloadedName = "vfncvt_xu" in
+          defm :
+            RVVConvBuiltinSet<"vfncvt_xu_f_w", "c", [["Uv", "UvFwu"]]>;
+      }
       let OverloadedName = "vfncvt_f" in {
         defm :
           RVVConvBuiltinSet<"vfncvt_f_x_w", "xf", [["v", "vIwu"]]>;
@@ -2061,10 +2089,18 @@ let ManualCodegen = [{
   let Log2LMUL = [-3, -2, -1, 0, 1, 2] in {
     let OverloadedName = "vfncvt_x" in
       defm :
-        RVVConvBuiltinSet<"vfncvt_x_f_w", "csi", [["Iv", "IvFw"]]>;
+        RVVConvBuiltinSet<"vfncvt_x_f_w", "si", [["Iv", "IvFw"]]>;
     let OverloadedName = "vfncvt_xu" in
       defm :
-        RVVConvBuiltinSet<"vfncvt_xu_f_w", "csi", [["Uv", "UvFw"]]>;
+        RVVConvBuiltinSet<"vfncvt_xu_f_w", "si", [["Uv", "UvFw"]]>;
+    let RequiredFeatures = ["Zvfh"] in {
+      let OverloadedName = "vfncvt_x" in
+        defm :
+          RVVConvBuiltinSet<"vfncvt_x_f_w", "c", [["Iv", "IvFw"]]>;
+      let OverloadedName = "vfncvt_xu" in
+        defm :
+          RVVConvBuiltinSet<"vfncvt_xu_f_w", "c", [["Uv", "UvFw"]]>;
+    }
     let OverloadedName = "vfncvt_f" in {
       defm :
         RVVConvBuiltinSet<"vfncvt_f_x_w", "xf", [["v", "vIw"]]>;

clang/include/clang/Basic/riscv_vector_common.td

@@ -604,10 +604,10 @@ class RVVConvToWidenUnsignedBuiltin<string overloaded_name>
     : RVVConvBuiltin<"Uw", "Uwv", "xf", overloaded_name>;
 
 class RVVConvToNarrowingSignedBuiltin<string overloaded_name>
-    : RVVConvBuiltin<"Iv", "IvFw", "csi", overloaded_name>;
+    : RVVConvBuiltin<"Iv", "IvFw", "si", overloaded_name>;
 
 class RVVConvToNarrowingUnsignedBuiltin<string overloaded_name>
-    : RVVConvBuiltin<"Uv", "UvFw", "csi", overloaded_name>;
+    : RVVConvBuiltin<"Uv", "UvFw", "si", overloaded_name>;
 
 let HasMaskedOffOperand = true in {
   multiclass RVVSignedReductionBuiltin {

clang/include/clang/Support/RISCVVIntrinsicUtils.h

@@ -502,7 +502,8 @@ enum RVVRequire : uint32_t {
   RVV_REQ_Zvksh = 1 << 15,
   RVV_REQ_Zvfbfwma = 1 << 16,
   RVV_REQ_Zvfbfmin = 1 << 17,
-  RVV_REQ_Experimental = 1 << 18,
+  RVV_REQ_Zvfh = 1 << 18,
+  RVV_REQ_Experimental = 1 << 19,
 
   LLVM_MARK_AS_BITMASK_ENUM(RVV_REQ_Experimental)
 };

clang/lib/Sema/SemaRISCV.cpp

@@ -222,6 +222,7 @@ void RISCVIntrinsicManagerImpl::ConstructRVVIntrinsics(
       {"zvksh", RVV_REQ_Zvksh},
       {"zvfbfwma", RVV_REQ_Zvfbfwma},
       {"zvfbfmin", RVV_REQ_Zvfbfmin},
+      {"zvfh", RVV_REQ_Zvfh},
       {"experimental", RVV_REQ_Experimental}};
 
   // Construction of RVVIntrinsicRecords need to sync with createRVVIntrinsics
@@ -280,6 +281,11 @@ void RISCVIntrinsicManagerImpl::ConstructRVVIntrinsics(
       if ((BaseTypeI & Record.TypeRangeMask) != BaseTypeI)
         continue;
 
+      // TODO: Remove the check below and use RequiredFeatures in
+      // riscv_vector.td to check the intrinsics instead, the type check should
+      // be done in checkRVVTypeSupport. This check also not able to work on the
+      // intrinsics that have Float16 but the BaseType is not Float16 such as
+      // `vfcvt_f_x_v`.
       if (BaseType == BasicType::Float16) {
         if ((Record.RequiredExtensions & RVV_REQ_Zvfhmin) == RVV_REQ_Zvfhmin) {
           if (!TI.hasFeature("zvfhmin"))

clang/utils/TableGen/RISCVVEmitter.cpp

@@ -670,6 +670,7 @@ void RVVEmitter::createRVVIntrinsics(
               .Case("Zvksh", RVV_REQ_Zvksh)
               .Case("Zvfbfwma", RVV_REQ_Zvfbfwma)
               .Case("Zvfbfmin", RVV_REQ_Zvfbfmin)
+              .Case("Zvfh", RVV_REQ_Zvfh)
               .Case("Experimental", RVV_REQ_Experimental)
               .Default(RVV_REQ_None);
       assert(RequireExt != RVV_REQ_None && "Unrecognized required feature?");