[FRONTEND] Fix a bool tensor storing problem (#746)

python/test/unit/language/test_core.py

@@ -756,6 +756,25 @@ def test_cast(dtype_x, dtype_z, bitcast, device='cuda'):
         assert to_numpy(z_tri) == z_ref
 
 
+def test_store_bool():
+    """Tests that boolean True is stored as 1"""
+    @triton.jit
+    def copy_kernel(input_ptr, output_ptr, n_elements, BLOCK_SIZE: tl.constexpr):
+        offsets = tl.program_id(axis=0) * BLOCK_SIZE + tl.arange(0, BLOCK_SIZE)
+        mask = offsets < n_elements
+        input = tl.load(input_ptr + offsets, mask=mask)
+        output = input
+        tl.store(output_ptr + offsets, output, mask=mask)
+
+    src = torch.tensor([True, False], dtype=torch.bool, device='cuda')
+    n_elements = src.numel()
+    dst = torch.empty_like(src)
+    grid = lambda meta: (triton.cdiv(n_elements, meta['BLOCK_SIZE']),)
+    copy_kernel[grid](src, dst, n_elements, BLOCK_SIZE=1024)
+
+    assert (to_numpy(src).view('uint8') == to_numpy(dst).view('uint8')).all()
+
+
 @pytest.mark.parametrize("dtype", [torch.float16, torch.bfloat16])
 def test_f8_xf16_roundtrip(dtype):
     """Tests that converting an f8 to f16 and back to f8 doesn't change its value"""

python/triton/language/semantic.py

@@ -761,8 +761,10 @@ def store(ptr: tl.tensor,
     elt_ty = ptr_ty.element_ty
     # treat bool* as tl.int8*
     if elt_ty == tl.int1:
-        elt_ty_ptr = tl.int8
-        ptr_ty = tl.pointer_type(elt_ty_ptr, ptr_ty.address_space)
+        # convert to bool first and then store as int8
+        val = cast(val, tl.int1, builder)
+        elt_ty = tl.int8
+        ptr_ty = tl.pointer_type(elt_ty, ptr_ty.address_space)
         ptr = cast(ptr, ptr_ty, builder)
     # eviction policy
     eviction = _parse_eviction_policy(eviction_policy)