expr: Fix &bitint_var handling in initializers [PR112336]

As the following testcase shows, we ICE when trying to emit ADDR_EXPR of
a bitint variable which doesn't have mode width.
The problem is in the EXTEND_BITINT stuff which makes sure we treat the
padding bits on memory reads from user bitint vars as undefined.
When expanding ADDR_EXPR on such vars inside outside of initializers,
expand_expr_addr* uses EXPAND_CONST_ADDRESS modifier and EXTEND_BITINT
does nothing, but in initializers it keeps using EXPAND_INITIALIZER
modifier.  So, we need to treat EXPAND_INITIALIZER the same as
EXPAND_CONST_ADDRESS for this regard.

2023-11-23  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/112336
	* expr.cc (EXTEND_BITINT): Don't call reduce_to_bit_field_precision
	if modifier is EXPAND_INITIALIZER.

	* gcc.dg/bitint-41.c: New test.

0 files changed, 0 insertions, 0 deletions