aarch64: Improve vector constant generation using SVE INDEX instruction [PR113328]

aarch64: Improve vector constant generation using SVE INDEX instruction [PR113328]

SVE's INDEX instruction can be used to populate vectors by values starting from
"base" and incremented by "step" for each subsequent value. We can take
advantage of it to generate vector constants if TARGET_SVE is available and the
base and step values are within [-16, 15].

For example, with the following function:

typedef int v4si __attribute__ ((vector_size (16)));
v4si
f_v4si (void)
{
  return (v4si){ 0, 1, 2, 3 };
}

GCC currently generates:

f_v4si:
	adrp    x0, .LC4
	ldr     q0, [x0, #:lo12:.LC4]
	ret

.LC4:
	.word   0
	.word   1
	.word   2
	.word   3

With this patch, we generate an INDEX instruction instead if TARGET_SVE is
available.

f_v4si:
	index   z0.s, #0, #1
	ret

	PR target/113328

gcc/ChangeLog:

	* config/aarch64/aarch64.cc (aarch64_simd_valid_immediate): Improve
	handling of some ADVSIMD vectors by using SVE's INDEX if TARGET_SVE is
	available.
	(aarch64_output_simd_mov_immediate): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/sve/acle/general/dupq_1.c: Update test to use
	SVE's INDEX instruction.
	* gcc.target/aarch64/sve/acle/general/dupq_2.c: Likewise.
	* gcc.target/aarch64/sve/acle/general/dupq_3.c: Likewise.
	* gcc.target/aarch64/sve/acle/general/dupq_4.c: Likewise.
	* gcc.target/aarch64/sve/vec_init_3.c: New test.

Signed-off-by: Pengxuan Zheng <quic_pzheng@quicinc.com>