My first impression is that it should be the same as Pmode, but I
admit it has more clear semantics, and would be useful when we have
ilp32 on rv64.
So LGTM
On Fri, Apr 28, 2023 at 2:16 PM Christoph Muellner
<christoph.muell...@vrull.eu> wrote:
>
> From: Christoph Müllner <christoph.muell...@vrull.eu>
>
> Define a Xmode macro that specifies the registers size (XLEN)
> similar to Pmode. This allows the backend code to write generic
> RV32/RV64 C code (under certain circumstances).
>
> gcc/ChangeLog:
>
> * config/riscv/riscv.h (Xmode): New macro.
>
> Signed-off-by: Christoph Müllner <christoph.muell...@vrull.eu>
> ---
> gcc/config/riscv/riscv.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/gcc/config/riscv/riscv.h b/gcc/config/riscv/riscv.h
> index 66fb07d6652..90746fe14e3 100644
> --- a/gcc/config/riscv/riscv.h
> +++ b/gcc/config/riscv/riscv.h
> @@ -791,6 +791,10 @@ typedef struct {
>
> #define Pmode word_mode
>
> +/* Specify the machine mode that registers have. */
> +
> +#define Xmode (TARGET_64BIT ? DImode : SImode)
> +
> /* Give call MEMs SImode since it is the "most permissive" mode
> for both 32-bit and 64-bit targets. */
>
> --
> 2.40.1
>
