RISC-V: Support vec_init for trailing same element

This patch would like to support the vec_init for the trailing same
element in the array. For example as below

typedef double vnx16df __attribute__ ((vector_size (128)));

__attribute__ ((noipa)) void
f_vnx16df (double a, double b, double *out)
{
  vnx16df v = {a, a, a, b, b, b, b, b, b, b, b, b, b, b, b, b};
  *(vnx16df *) out = v;
}

Before this patch:
f_vnx16df:
  vsetivli        zero,16,e64,m8,ta,ma
  vfmv.v.f        v8,fa0
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vfslide1down.vf v8,v8,fa1
  vs8r.v  v8,0(a0)
  ret

After this patch:
f_vnx16df:
  vsetivli      zero,16,e64,m8,ta,ma
  vfmv.v.f      v16,fa1
  vfslide1up.vf v8,v16,fa0
  vmv8r.v       v16,v8
  vfslide1up.vf v8,v16,fa0
  vmv8r.v       v16,v8
  vfslide1up.vf v8,v16,fa0
  vs8r.v        v8,0(a0)
  ret

gcc/ChangeLog:

	* config/riscv/riscv-v.cc (expand_vector_init_trailing_same_elem):
	New fun impl to expand the insn when trailing same elements.
	(expand_vec_init): Try trailing same elements when vec_init.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/vls-vlmax/init-same-tail-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls-vlmax/init-same-tail-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls-vlmax/init-same-tail-3.c: New test.
	* gcc.target/riscv/rvv/autovec/vls-vlmax/init-same-tail-4.c: New test.
	* gcc.target/riscv/rvv/autovec/vls-vlmax/init-same-tail-5.c: New test.
	* gcc.target/riscv/rvv/autovec/vls-vlmax/init-same-tail-run-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls-vlmax/init-same-tail-run-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls-vlmax/init-same-tail-run-3.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/init-same-tail-1.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/init-same-tail-2.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/init-same-tail-3.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/init-same-tail-4.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/init-same-tail-5.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/init-same-tail-6.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/init-same-tail-7.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/init-same-tail-8.c: New test.
	* gcc.target/riscv/rvv/autovec/vls/init-same-tail-9.c: New test.

Signed-off-by: Pan Li <pan2.li@intel.com>

0 files changed, 0 insertions, 0 deletions