i386: Disable string insn from non-default AS for Pmode != word_mode [PR111657]

i386: Disable string insn from non-default AS for Pmode != word_mode [PR111657]

0x67 prefix is applied before segment register. That is in

	rep movsq %gs:(%esi), (%edi)

the address is %gs + %esi. In case Pmode != word_mode (x32 with a default
-maddress-mode=short) instructions should not allow segment override prefixes.

Also, remove explicit addr32 prefix from asm templates because address
mode can be determined from explicit instruction operands. Also note that
Pmode != word_mode only with TARGET_64BIT, so the check in ix86_print_operand
is not needed.

	PR target/111657

gcc/ChangeLog:

	* config/i386/i386-expand.cc (alg_usable_p): For Pmode != word_mode
	reject rep_prefix_{1,4,8}_byte algorithms with src_as in the
	non-default address space.
	* config/i386/i386-protos.h (ix86_check_movs): New prototype.
	* config/i386/i386.cc (ix86_check_movs): New function.
	(ix86_print_operand) [case '^']: Remove excess check for TARGET_64BIT.
	* config/i386/i386.md (strmov): For Pmode != word_mode expand with
	gen_strmov_single only when operands[3] (source) is in the default
	address space.
	(*strmovdi_rex_1) Use ix86_check_movs.  Remove %^ from asm template.
	(*strmovsi_1): Ditto.
	(*strmovhi_1): DItto.
	(*strmovqi_1): Ditto.
	(*rep_movdi_rex64): Ditto.
	(*rep_movsi): Ditto.
	(*rep_movqi): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr111657-1.c: Check that segment override is not
	generated for "rep movsq" for x32 target.