Recompute TYPE_MODE and DECL_MODE for aggregate type for acclerator.

The patch streams out VOIDmode for aggregate types with offloading enabled,
and recomputes appropriate TYPE_MODE and DECL_MODE while streaming-in on accel
side. The rationale for this change is to avoid streaming out host-specific
modes that may be used for aggregate types, which may not be representable on
the accelerator. For eg, AArch64 uses OImode for ARRAY_TYPE whose size is 256-bits,
and nvptx doesn't have OImode, and thus ends up emitting an error from
lto_input_mode_table.

gcc/ChangeLog:
	* lto-streamer-in.cc: (lto_read_tree_1): Set DECL_MODE (expr) to
	TREE_TYPE (TYPE_MODE (expr)) if TREE_TYPE (expr) is aggregate type and
	offloading is enabled.
	* stor-layout.cc (layout_type): Move computation of mode for
	ARRAY_TYPE from ...
	(compute_array_mode): ... to here.
	* stor-layout.h (compute_array_mode): Declare.
	* tree-streamer-in.cc: Include stor-layout.h.
	(unpack_ts_common_value_fields): Call compute_array_mode if offloading
	is enabled.
	* tree-streamer-out.cc (pack_ts_fixed_cst_value_fields): Stream out
	VOIDmode if decl has aggregate type and offloading is enabled.
	(pack_ts_type_common_value_fields): Stream out VOIDmode for aggregate
	type if offloading is enabled.

Signed-off-by: Prathamesh Kulkarni <prathameshk@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/gcc/stor-layout.h b/gcc/stor-layout.h
index 096ca81..9d9b8c3 100644
--- a/gcc/stor-layout.h
+++ b/gcc/stor-layout.h
@@ -34,6 +34,7 @@ extern tree rli_size_so_far (record_layout_info);
 extern void normalize_rli (record_layout_info);
 extern void place_field (record_layout_info, tree);
 extern void compute_record_mode (tree);
+extern void compute_array_mode (tree);
 extern void finish_bitfield_layout (tree);
 extern void finish_record_layout (record_layout_info, int);
 extern void finalize_size_functions (void);