diff --git a/llvm/include/llvm/IR/IntrinsicsAArch64.td b/llvm/include/llvm/IR/IntrinsicsAArch64.td
--- a/llvm/include/llvm/IR/IntrinsicsAArch64.td
+++ b/llvm/include/llvm/IR/IntrinsicsAArch64.td
@@ -2107,12 +2107,12 @@
 // Reinterpreting data
 //
 
-def int_aarch64_sve_convert_from_svbool : DefaultAttrsIntrinsic<[llvm_anyvector_ty],
+def int_aarch64_sve_convert_from_svbool : DefaultAttrsIntrinsic<[llvm_any_ty],
                                                     [llvm_nxv16i1_ty],
                                                     [IntrNoMem]>;
 
 def int_aarch64_sve_convert_to_svbool : DefaultAttrsIntrinsic<[llvm_nxv16i1_ty],
-                                                  [llvm_anyvector_ty],
+                                                  [llvm_any_ty],
                                                   [IntrNoMem]>;
 
 //
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -5042,8 +5042,12 @@
   case Intrinsic::aarch64_sve_dupq_lane:
     return LowerDUPQLane(Op, DAG);
   case Intrinsic::aarch64_sve_convert_from_svbool:
+    if (Op.getValueType() == MVT::aarch64svcount)
+      return DAG.getNode(ISD::BITCAST, dl, Op.getValueType(), Op.getOperand(1));
     return getSVEPredicateBitCast(Op.getValueType(), Op.getOperand(1), DAG);
   case Intrinsic::aarch64_sve_convert_to_svbool:
+    if (Op.getOperand(1).getValueType() == MVT::aarch64svcount)
+      return DAG.getNode(ISD::BITCAST, dl, MVT::nxv16i1, Op.getOperand(1));
     return getSVEPredicateBitCast(MVT::nxv16i1, Op.getOperand(1), DAG);
   case Intrinsic::aarch64_sve_fneg:
     return DAG.getNode(AArch64ISD::FNEG_MERGE_PASSTHRU, dl, Op.getValueType(),
diff --git a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
--- a/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
+++ b/llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
@@ -737,6 +737,11 @@
   if (auto BinOpCombine = tryCombineFromSVBoolBinOp(IC, II))
     return BinOpCombine;
 
+  // Ignore converts to/from svcount_t.
+  if (isa<TargetExtType>(II.getArgOperand(0)->getType()) ||
+      isa<TargetExtType>(II.getType()))
+    return std::nullopt;
+
   SmallVector<Instruction *, 32> CandidatesForRemoval;
   Value *Cursor = II.getOperand(0), *EarliestReplacement = nullptr;
 
diff --git a/llvm/test/CodeGen/AArch64/sve-intrinsics-reinterpret.ll b/llvm/test/CodeGen/AArch64/sve-intrinsics-reinterpret.ll
--- a/llvm/test/CodeGen/AArch64/sve-intrinsics-reinterpret.ll
+++ b/llvm/test/CodeGen/AArch64/sve-intrinsics-reinterpret.ll
@@ -55,6 +55,14 @@
   ret <vscale x 16 x i1> %res
 }
 
+define <vscale x 16 x i1> @reinterpret_bool_from_svcount(target("aarch64.svcount") %pg) "target-features"="+sme2" {
+; CHECK-LABEL: reinterpret_bool_from_svcount:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    ret
+  %out = call <vscale x 16 x i1> @llvm.aarch64.sve.convert.to.svbool.taarch64.svcountt(target("aarch64.svcount") %pg)
+  ret <vscale x 16 x i1> %out
+}
+
 ;
 ; Converting from svbool_t
 ;
@@ -99,6 +107,15 @@
   ret <vscale x 1 x i1> %out
 }
 
+define target("aarch64.svcount") @reinterpret_bool_to_svcount(<vscale x 16 x i1> %pg) "target-features"="+sme2" {
+; CHECK-LABEL: reinterpret_bool_to_svcount:
+; CHECK:       // %bb.0:
+; CHECK-NEXT:    ret
+  %out = call target("aarch64.svcount") @llvm.aarch64.sve.convert.from.svbool.taarch64.svcountt(<vscale x 16 x i1> %pg)
+  ret target("aarch64.svcount") %out
+}
+
+
 ; Reinterpreting a ptrue should not introduce an `and` instruction.
 define <vscale x 16 x i1> @reinterpret_ptrue() {
 ; CHECK-LABEL: reinterpret_ptrue:
@@ -142,9 +159,11 @@
 declare <vscale x 16 x i1> @llvm.aarch64.sve.convert.to.svbool.nxv4i1(<vscale x 4 x i1>)
 declare <vscale x 16 x i1> @llvm.aarch64.sve.convert.to.svbool.nxv2i1(<vscale x 2 x i1>)
 declare <vscale x 16 x i1> @llvm.aarch64.sve.convert.to.svbool.nxv1i1(<vscale x 1 x i1>)
+declare <vscale x 16 x i1> @llvm.aarch64.sve.convert.to.svbool.taarch64.svcountt(target("aarch64.svcount"))
 
 declare <vscale x 16 x i1> @llvm.aarch64.sve.convert.from.svbool.nxv16i1(<vscale x 16 x i1>)
 declare <vscale x 8 x i1> @llvm.aarch64.sve.convert.from.svbool.nxv8i1(<vscale x 16 x i1>)
 declare <vscale x 4 x i1> @llvm.aarch64.sve.convert.from.svbool.nxv4i1(<vscale x 16 x i1>)
 declare <vscale x 2 x i1> @llvm.aarch64.sve.convert.from.svbool.nxv2i1(<vscale x 16 x i1>)
 declare <vscale x 1 x i1> @llvm.aarch64.sve.convert.from.svbool.nxv1i1(<vscale x 16 x i1>)
+declare target("aarch64.svcount") @llvm.aarch64.sve.convert.from.svbool.taarch64.svcountt(<vscale x 16 x i1>)