GCC was recently changed to prevent simplify_subreg from simplifying
a subreg of a mem when the mode of the new mem would have stricter alignment
constraints than the inner mem already has when the target requires
STRICT_ALIGNMENT.

However, such targets may have specialist patterns that can handle
unaligned accesses and this restriction turns out to be unduly restrictive.
So limit this restriction to only apply when the inner mem is naturally
aligned to the inner mode.

gcc/ChangeLog:

	PR target/102125
	* simplify-rtx.c (simplify_context::simplify_subreg): Allow
	simplifying (subreg (mem())) when the inner mem is already
	misaligned for its type.
---
 gcc/simplify-rtx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)