RISC-V: Fix vfirst/vmsbf/vmsif/vmsof ratio attributes

vfirst/vmsbf/vmsif/vmsof instructions are supposed to demand ratio instead of demanding sew_lmul.
But my previous typo makes VSETVL PASS miss honor the risc-v v spec.

Consider this following simple case:

int foo4 (void * in, void * out)
{
  vint32m1_t v = __riscv_vle32_v_i32m1 (in, 4);
  v = __riscv_vadd_vv_i32m1 (v, v, 4);
  vbool32_t mask = __riscv_vreinterpret_v_i32m1_b32(v);
  mask = __riscv_vmsof_m_b32(mask, 4);
  return __riscv_vfirst_m_b32(mask, 4);
}

Before this patch:

foo4:
        vsetivli        zero,4,e32,m1,ta,ma
        vle32.v v1,0(a0)
        vadd.vv v1,v1,v1
        vsetvli zero,zero,e8,mf4,ta,ma    ----> redundant.
        vmsof.m v2,v1
        vfirst.m        a0,v2
        ret

After this patch:

foo4:
	vsetivli	zero,4,e32,m1,ta,ma
	vle32.v	v1,0(a0)
	vadd.vv	v1,v1,v1
	vmsof.m	v2,v1
	vfirst.m	a0,v2
	ret

Confirm RVV spec and Clang, this patch makes VSETVL PASS match the correct behavior.

Tested on both RV32/RV64, no regression.

gcc/ChangeLog:

	* config/riscv/vector.md: Fix vfirst/vmsbf/vmsof ratio attributes.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/vsetvl/attribute-1.c: New test.

0 files changed, 0 insertions, 0 deletions