We take no action to ensure the SVE vector size is large enough.  It is
left to the user to check that before compiling this intrinsic or before
running such a program on a machine.

The main difference between ld1ro and ld1rq is in the allowed offsets,
the implementation difference is that ld1ro is implemented using integer
modes since there are no pre-existing vector modes of the relevant size.
Adding new vector modes simply for this intrinsic seems to make the code
less tidy.

Specifications can be found under the "Arm C Language Extensions for
Scalable Vector Extension" title at
https://developer.arm.com/architectures/system-architectures/software-standards/acle

gcc/ChangeLog:

2020-01-17  Matthew Malcomson  <matthew.malcomson@arm.com>

	* config/aarch64/aarch64-protos.h
	(aarch64_sve_ld1ro_operand_p): New.
	* config/aarch64/aarch64-sve-builtins-base.cc
	(class load_replicate): New.
	(class svld1ro_impl): New.
	(class svld1rq_impl): Change to inherit from load_replicate.
	(svld1ro): New sve intrinsic function base.
	* config/aarch64/aarch64-sve-builtins-base.def (svld1ro):
	New DEF_SVE_FUNCTION.
	* config/aarch64/aarch64-sve-builtins-base.h
	(svld1ro): New decl.
	* config/aarch64/aarch64-sve-builtins.cc
	(function_expander::add_mem_operand): Modify assert to allow
	OImode.
	* config/aarch64/aarch64-sve.md (@aarch64_sve_ld1ro<mode>): New
	pattern.
	* config/aarch64/aarch64.c
	(aarch64_sve_ld1rq_operand_p): Implement in terms of ...
	(aarch64_sve_ld1rq_ld1ro_operand_p): This.
	(aarch64_sve_ld1ro_operand_p): New.
	* config/aarch64/aarch64.md (UNSPEC_LD1RO): New unspec.
	* config/aarch64/constraints.md (UOb,UOh,UOw,UOd): New.
	* config/aarch64/predicates.md
	(aarch64_sve_ld1ro_operand_{b,h,w,d}): New.

gcc/testsuite/ChangeLog:

2020-01-17  Matthew Malcomson  <matthew.malcomson@arm.com>

	* gcc.target/aarch64/sve/acle/asm/ld1ro_f16.c: New test.
	* gcc.target/aarch64/sve/acle/asm/ld1ro_f32.c: New test.
	* gcc.target/aarch64/sve/acle/asm/ld1ro_f64.c: New test.
	* gcc.target/aarch64/sve/acle/asm/ld1ro_s16.c: New test.
	* gcc.target/aarch64/sve/acle/asm/ld1ro_s32.c: New test.
	* gcc.target/aarch64/sve/acle/asm/ld1ro_s64.c: New test.
	* gcc.target/aarch64/sve/acle/asm/ld1ro_s8.c: New test.
	* gcc.target/aarch64/sve/acle/asm/ld1ro_u16.c: New test.
	* gcc.target/aarch64/sve/acle/asm/ld1ro_u32.c: New test.
	* gcc.target/aarch64/sve/acle/asm/ld1ro_u64.c: New test.
	* gcc.target/aarch64/sve/acle/asm/ld1ro_u8.c: New test.