[bug] Fix struct field error on bool on cuda

taichi/codegen/cuda/codegen_cuda.cpp

@@ -599,6 +599,17 @@ class TaskCodeGenCUDA : public TaskCodeGenLLVM {
     // Issue an "__ldg" instruction to cache data in the read-only data cache.
     auto intrin = ty->isFloatingPointTy() ? llvm::Intrinsic::nvvm_ldg_global_f
                                           : llvm::Intrinsic::nvvm_ldg_global_i;
+    // Special treatment for bool types. As nvvm_ldg_global_i does not support
+    // 1-bit integer, so we convert them to i8.
+    if (ty->getScalarSizeInBits() == 1) {
+      auto *new_ty = tlctx->get_data_type<uint8>();
+      auto *new_ptr =
+          builder->CreatePointerCast(ptr, llvm::PointerType::get(new_ty, 0));
+      auto *v = builder->CreateIntrinsic(
+          intrin, {new_ty, llvm::PointerType::get(new_ty, 0)},
+          {new_ptr, tlctx->get_constant(new_ty->getScalarSizeInBits())});
+      return builder->CreateIsNotNull(v);
+    }
     return builder->CreateIntrinsic(
         intrin, {ty, llvm::PointerType::get(ty, 0)},
         {ptr, tlctx->get_constant(ty->getScalarSizeInBits())});

tests/python/test_struct.py

@@ -154,3 +154,35 @@ def k() -> int:
         return x.testme()
 
     assert k() == 42
+
+
+@test_utils.test(arch=[ti.cpu, ti.cuda, ti.amdgpu])
+def test_struct_field_with_bool():
+    @ti.dataclass
+    class S:
+        a: ti.i16
+        b: bool
+        c: ti.i16
+
+    sf = S.field(shape=(10, 1))
+    sf[0, 0].b = False
+    sf[0, 0].a = 0xFFFF
+    sf[0, 0].c = 0xFFFF
+
+    def foo() -> S:
+        return sf[0, 0]
+
+    assert foo().a == -1
+    assert foo().c == -1
+    assert foo().b == False
+
+    sf[1, 0].a = 0x0000
+    sf[1, 0].c = 0x0000
+    sf[1, 0].b = True
+
+    def bar() -> S:
+        return sf[1, 0]
+
+    assert bar().a == 0
+    assert bar().c == 0
+    assert bar().b == True