[PATCH] RISC-V: Remove FRM_REGNUM dependency for rtx conversions

[Kito Cheng]

LGTM, thanks :)

On Wed, May 24, 2023 at 7:26 PM <juzhe.zhong@rivai.ai> wrote:
>
> From: Juzhe-Zhong <juzhe.zhong@rivai.ai>
>
> According to RVV ISA:
> The conversions use the dynamic rounding mode in frm, except for the rtz variants, which round towards zero.
>
> So rtz conversion patterns should not have FRM dependency.
>
> We can't support mode switching for FRM yet since rvv intrinsic doc is not updated but
> I think this patch is correct.
>
> gcc/ChangeLog:
>
>         * config/riscv/vector.md: Remove FRM_REGNUM dependency in rtz instructions.
>
> ---
>  gcc/config/riscv/vector.md | 12 +++---------
>  1 file changed, 3 insertions(+), 9 deletions(-)
>
> diff --git a/gcc/config/riscv/vector.md b/gcc/config/riscv/vector.md
> index 9afef0d12bc..15f66efaa48 100644
> --- a/gcc/config/riscv/vector.md
> +++ b/gcc/config/riscv/vector.md
> @@ -7072,10 +7072,8 @@
>              (match_operand 5 "const_int_operand"            "  i,  i,  i,  i")
>              (match_operand 6 "const_int_operand"            "  i,  i,  i,  i")
>              (match_operand 7 "const_int_operand"            "  i,  i,  i,  i")
> -            (match_operand 8 "const_int_operand"            "  i,  i,  i,  i")
>              (reg:SI VL_REGNUM)
> -            (reg:SI VTYPE_REGNUM)
> -            (reg:SI FRM_REGNUM)] UNSPEC_VPREDICATE)
> +            (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
>           (any_fix:<VCONVERT>
>              (match_operand:VF 3 "register_operand"          " vr, vr, vr, vr"))
>           (match_operand:<VCONVERT> 2 "vector_merge_operand" " vu,  0, vu,  0")))]
> @@ -7142,10 +7140,8 @@
>              (match_operand 5 "const_int_operand"            "    i,    i")
>              (match_operand 6 "const_int_operand"            "    i,    i")
>              (match_operand 7 "const_int_operand"            "    i,    i")
> -            (match_operand 8 "const_int_operand"            "    i,    i")
>              (reg:SI VL_REGNUM)
> -            (reg:SI VTYPE_REGNUM)
> -            (reg:SI FRM_REGNUM)] UNSPEC_VPREDICATE)
> +            (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
>           (any_fix:VWCONVERTI
>              (match_operand:<VNCONVERT> 3 "register_operand" "   vr,   vr"))
>           (match_operand:VWCONVERTI 2 "vector_merge_operand" "   vu,    0")))]
> @@ -7233,10 +7229,8 @@
>              (match_operand 5 "const_int_operand"             "  i,  i,  i,  i,    i,    i")
>              (match_operand 6 "const_int_operand"             "  i,  i,  i,  i,    i,    i")
>              (match_operand 7 "const_int_operand"             "  i,  i,  i,  i,    i,    i")
> -            (match_operand 8 "const_int_operand"             "  i,  i,  i,  i,    i,    i")
>              (reg:SI VL_REGNUM)
> -            (reg:SI VTYPE_REGNUM)
> -            (reg:SI FRM_REGNUM)] UNSPEC_VPREDICATE)
> +            (reg:SI VTYPE_REGNUM)] UNSPEC_VPREDICATE)
>           (any_fix:<VNCONVERT>
>              (match_operand:VF 3 "register_operand"           "  0,  0,  0,  0,   vr,   vr"))
>           (match_operand:<VNCONVERT> 2 "vector_merge_operand" " vu,  0, vu,  0,   vu,    0")))]
> --
> 2.36.1
>