[MLIR][LLVM] Importer: fix void returning intrinsic calls (llvm#138325)

Author: bcardosolopes

mlir/lib/Target/LLVMIR/LLVMImportInterface.cpp

@@ -37,9 +37,10 @@ LogicalResult mlir::LLVMImportInterface::convertUnregisteredIntrinsic(
           llvmOperands, llvmOpBundles, false, {}, {}, mlirOperands, mlirAttrs)))
     return failure();
 
-  Type results = moduleImport.convertType(inst->getType());
+  Type resultType = moduleImport.convertType(inst->getType());
   auto op = builder.create<::mlir::LLVM::CallIntrinsicOp>(
-      moduleImport.translateLoc(inst->getDebugLoc()), results,
+      moduleImport.translateLoc(inst->getDebugLoc()),
+      isa<LLVMVoidType>(resultType) ? TypeRange{} : TypeRange{resultType},
       StringAttr::get(builder.getContext(), intrinName),
       ValueRange{mlirOperands}, FastmathFlagsAttr{});
 

mlir/test/Dialect/LLVMIR/roundtrip.mlir

@@ -1033,3 +1033,12 @@ llvm.func @blockaddr_fn() {
 // CHECK-NEXT:  llvm.br ^bb1
 // CHECK-NEXT:^bb1:
 // CHECK-NEXT:  llvm.blocktag <id = 0>
+
+llvm.func @callintrin_voidret(%arg0: vector<8xi8>, %arg1: vector<8xi8>, %arg2: vector<8xi8>, %arg3: !llvm.ptr) {
+  llvm.call_intrinsic "llvm.aarch64.neon.st3.v8i8.p0"(%arg0, %arg1, %arg2, %arg3) : (vector<8xi8>, vector<8xi8>, vector<8xi8>, !llvm.ptr) -> ()
+  llvm.return
+}
+llvm.func @llvm.aarch64.neon.st3.v8i8.p0(vector<8xi8>, vector<8xi8>, vector<8xi8>, !llvm.ptr)
+
+// CHECK-LABEL: llvm.func @callintrin_voidret
+// CHECK-NEXT: llvm.call_intrinsic "llvm.aarch64.neon.st3.v8i8.p0"(%arg0, %arg1, %arg2, %arg3) : (vector<8xi8>, vector<8xi8>, vector<8xi8>, !llvm.ptr) -> ()

mlir/test/Target/LLVMIR/Import/intrinsic-prefer-unregistered.ll

@@ -2,9 +2,9 @@
 
 ; CHECK-LABEL: llvm.func @lifetime
 define void @lifetime(ptr %0) {
-  ; CHECK: llvm.call_intrinsic "llvm.lifetime.start.p0"({{.*}}, %arg0) : (i64, !llvm.ptr {llvm.nonnull}) -> !llvm.void
+  ; CHECK: llvm.call_intrinsic "llvm.lifetime.start.p0"({{.*}}, %arg0) : (i64, !llvm.ptr {llvm.nonnull}) -> ()
   call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %0)
-  ; CHECK: llvm.call_intrinsic "llvm.lifetime.end.p0"({{.*}}, %arg0) : (i64, !llvm.ptr {llvm.nonnull}) -> !llvm.void
+  ; CHECK: llvm.call_intrinsic "llvm.lifetime.end.p0"({{.*}}, %arg0) : (i64, !llvm.ptr {llvm.nonnull}) -> ()
   call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %0)
   ret void
 }

mlir/test/Target/LLVMIR/Import/intrinsic-unregistered.ll

@@ -37,7 +37,7 @@ define dso_local void @t2(<8 x i8> %lhs, <8 x i8> %rhs, ptr %a) {
 }
 
 ; CHECK: llvm.func @t2(%[[A0:.*]]: vector<8xi8>, %[[A1:.*]]: vector<8xi8>, %[[A2:.*]]: !llvm.ptr) {{.*}} {
-; CHECK:   llvm.call_intrinsic "llvm.aarch64.neon.st2.v8i8.p0"(%[[A0]], %[[A1]], %[[A2]]) : (vector<8xi8>, vector<8xi8>, !llvm.ptr) -> !llvm.void
+; CHECK:   llvm.call_intrinsic "llvm.aarch64.neon.st2.v8i8.p0"(%[[A0]], %[[A1]], %[[A2]]) : (vector<8xi8>, vector<8xi8>, !llvm.ptr) -> ()
 ; CHECK:   llvm.return
 ; CHECK: }
 
@@ -51,7 +51,7 @@ define void @gctest() gc "example" {
 }
 
 ; CHECK-LABEL: @gctest
-; CHECK: llvm.call_intrinsic "llvm.gcroot"({{.*}}, {{.*}}) : (!llvm.ptr, !llvm.ptr) -> !llvm.void
+; CHECK: llvm.call_intrinsic "llvm.gcroot"({{.*}}, {{.*}}) : (!llvm.ptr, !llvm.ptr) -> ()
 
 ; // -----