RISC-V: Support MASK_LEN_{LOAD_LANES,STORE_LANES}

RISC-V: Support MASK_LEN_{LOAD_LANES,STORE_LANES}

This patch allow us auto-vectorize this following case:

  void __attribute__ ((noinline, noclone))                                     \
  NAME##_8 (OUTTYPE *__restrict dest, INTYPE *__restrict src,                  \
	    MASKTYPE *__restrict cond, intptr_t n)                             \
  {                                                                            \
    for (intptr_t i = 0; i < n; ++i)                                           \
      if (cond[i])                                                             \
	dest[i] = (src[i * 8] + src[i * 8 + 1] + src[i * 8 + 2]                \
		   + src[i * 8 + 3] + src[i * 8 + 4] + src[i * 8 + 5]          \
		   + src[i * 8 + 6] + src[i * 8 + 7]);                         \
  }

  TEST_LOOP (NAME##_f32, OUTTYPE, INTYPE, int32_t)                               \

  TEST2 (NAME##_i32, OUTTYPE, int32_t)                                         \

  TEST1 (NAME##_i32, int32_t)                                                  \

TEST (test)

ASM:

test_i32_i32_f32_8:
	ble	a3,zero,.L5
.L3:
	vsetvli	a4,a3,e8,mf4,ta,ma
	vle32.v	v0,0(a2)
	vsetvli	a5,zero,e32,m1,ta,ma
	vmsne.vi	v0,v0,0
	vsetvli	zero,a4,e32,m1,ta,ma
	vlseg8e32.v	v8,(a1),v0.t
	vsetvli	a5,zero,e32,m1,ta,ma
	slli	a6,a4,2
	vadd.vv	v1,v9,v8
	slli	a7,a4,5
	vadd.vv	v1,v1,v10
	sub	a3,a3,a4
	vadd.vv	v1,v1,v11
	vadd.vv	v1,v1,v12
	vadd.vv	v1,v1,v13
	vadd.vv	v1,v1,v14
	vadd.vv	v1,v1,v15
	vsetvli	zero,a4,e32,m1,ta,ma
	vse32.v	v1,0(a0),v0.t
	add	a2,a2,a6
	add	a1,a1,a7
	add	a0,a0,a6
	bne	a3,zero,.L3
.L5:
	ret

gcc/ChangeLog:

	* config/riscv/autovec.md (vec_mask_len_load_lanes<mode><vsingle>):
	New pattern.
	(vec_mask_len_store_lanes<mode><vsingle>): Ditto.
	* config/riscv/riscv-protos.h (expand_lanes_load_store): New function.
	* config/riscv/riscv-v.cc (get_mask_mode): Add tuple mask mode.
	(expand_lanes_load_store): New function.
	* config/riscv/vector-iterators.md: New iterator.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/gather-scatter/strided_load-2.c:
	Adapt test.
	* gcc.target/riscv/rvv/autovec/partial/slp-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/partial/slp-16.c: Ditto.
	* gcc.target/riscv/rvv/autovec/partial/slp-17.c: Ditto.
	* gcc.target/riscv/rvv/autovec/partial/slp-18.c: Ditto.
	* gcc.target/riscv/rvv/autovec/partial/slp-19.c: Ditto.
	* gcc.target/riscv/rvv/autovec/partial/slp-2.c: Ditto.
	* gcc.target/riscv/rvv/autovec/partial/slp-3.c: Ditto.
	* gcc.target/riscv/rvv/autovec/partial/slp-4.c: Ditto.
	* gcc.target/riscv/rvv/autovec/partial/slp-5.c: Ditto.
	* gcc.target/riscv/rvv/autovec/partial/slp-6.c: Ditto.
	* gcc.target/riscv/rvv/rvv.exp: Add lanes tests.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load-1.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load-2.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load-3.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load-4.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load-5.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load-6.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load-7.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load_run-1.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load_run-2.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load_run-3.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load_run-4.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load_run-5.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load_run-6.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_load_run-7.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store-1.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store-2.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store-3.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store-4.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store-5.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store-6.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store-7.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store_run-1.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store_run-2.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store_run-3.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store_run-4.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store_run-5.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store_run-6.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/mask_struct_store_run-7.c:
	New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-1.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-10.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-11.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-12.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-13.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-14.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-15.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-16.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-17.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-18.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-2.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-3.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-4.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-5.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-6.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-7.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-8.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect-9.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-1.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-10.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-11.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-12.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-13.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-14.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-15.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-16.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-17.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-18.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-2.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-3.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-4.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-5.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-6.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-7.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-8.c: New test.
	* gcc.target/riscv/rvv/autovec/struct/struct_vect_run-9.c: New test.