On Tue, Jul 30, 2024 at 12:18 PM Richard Biener <[email protected]> wrote:
>
> The following implements the hook, excluding x87 modes for scalar
> and complex float modes.
>
> Bootstrapped and tested on x86_64-unknown-linux-gnu.
>
> OK?
>
> Thanks,
> Richard.
>
> * i386.cc (TARGET_MODE_CAN_TRANSFER_BITS): Define.
> (ix86_mode_can_transfer_bits): New function.
> ---
> gcc/config/i386/i386.cc | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
> index 12d15feb5e9..5184366916b 100644
> --- a/gcc/config/i386/i386.cc
> +++ b/gcc/config/i386/i386.cc
> @@ -26113,6 +26113,24 @@ ix86_have_ccmp ()
> return (bool) TARGET_APX_CCMP;
> }
>
> +/* Implement TARGET_MODE_CAN_TRANSFER_BITS. */
> +static bool
> +ix86_mode_can_transfer_bits (machine_mode mode)
> +{
> + if (GET_MODE_CLASS (mode) == MODE_FLOAT
> + || GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT)
> + switch (GET_MODE_INNER (mode))
> + {
> + case SFmode:
> + case DFmode:
> + return TARGET_SSE_MATH && !TARGET_MIX_SSE_I387;
This can be simplified to:
return !(ix86_fpmath & FPMATH_387);
(Which implies that we should introduce TARGET_I387_MATH to parallel
TARGET_SSE_MATH some day...)
> + default:
> + return false;
We don't want to enable HFmode for transfers?
Uros.
> + }
> +
> + return true;
> +}
> +
> /* Target-specific selftests. */
>
> #if CHECKING_P
> @@ -26959,6 +26977,9 @@ ix86_libgcc_floating_mode_supported_p
> #undef TARGET_HAVE_CCMP
> #define TARGET_HAVE_CCMP ix86_have_ccmp
>
> +#undef TARGET_MODE_CAN_TRANSFER_BITS
> +#define TARGET_MODE_CAN_TRANSFER_BITS ix86_mode_can_transfer_bits
> +
> static bool
> ix86_libc_has_fast_function (int fcode ATTRIBUTE_UNUSED)
> {
> --
> 2.43.0
>
